diff options
Diffstat (limited to 'Documentation/fb')
| -rw-r--r-- | Documentation/fb/00-INDEX | 25 | ||||
| -rw-r--r-- | Documentation/fb/aty128fb.txt | 72 | ||||
| -rw-r--r-- | Documentation/fb/cirrusfb.txt | 97 | ||||
| -rw-r--r-- | Documentation/fb/framebuffer.txt | 345 | ||||
| -rw-r--r-- | Documentation/fb/intel810.txt | 272 | ||||
| -rw-r--r-- | Documentation/fb/internals.txt | 82 | ||||
| -rw-r--r-- | Documentation/fb/matroxfb.txt | 415 | ||||
| -rw-r--r-- | Documentation/fb/modedb.txt | 61 | ||||
| -rw-r--r-- | Documentation/fb/pvr2fb.txt | 61 | ||||
| -rw-r--r-- | Documentation/fb/pxafb.txt | 54 | ||||
| -rw-r--r-- | Documentation/fb/sa1100fb.txt | 39 | ||||
| -rw-r--r-- | Documentation/fb/sisfb.txt | 158 | ||||
| -rw-r--r-- | Documentation/fb/sstfb.txt | 174 | ||||
| -rw-r--r-- | Documentation/fb/tgafb.txt | 69 | ||||
| -rw-r--r-- | Documentation/fb/tridentfb.txt | 54 | ||||
| -rw-r--r-- | Documentation/fb/vesafb.txt | 167 |
16 files changed, 2145 insertions, 0 deletions
diff --git a/Documentation/fb/00-INDEX b/Documentation/fb/00-INDEX new file mode 100644 index 00000000000..92e89aeef52 --- /dev/null +++ b/Documentation/fb/00-INDEX @@ -0,0 +1,25 @@ +Index of files in Documentation/fb. If you think something about frame +buffer devices needs an entry here, needs correction or you've written one +please mail me. + Geert Uytterhoeven <geert@linux-m68k.org> + +00-INDEX + - this file +framebuffer.txt + - introduction to frame buffer devices +internals.txt + - quick overview of frame buffer device internals +modedb.txt + - info on the video mode database +aty128fb.txt + - info on the ATI Rage128 frame buffer driver +clgenfb.txt + - info on the Cirrus Logic frame buffer driver +matroxfb.txt + - info on the Matrox frame buffer driver +pvr2fb.txt + - info on the PowerVR 2 frame buffer driver +tgafb.txt + - info on the TGA (DECChip 21030) frame buffer driver +vesafb.txt + - info on the VESA frame buffer device diff --git a/Documentation/fb/aty128fb.txt b/Documentation/fb/aty128fb.txt new file mode 100644 index 00000000000..069262fb619 --- /dev/null +++ b/Documentation/fb/aty128fb.txt @@ -0,0 +1,72 @@ +[This file is cloned from VesaFB/matroxfb] + +What is aty128fb? +================= + +This is a driver for a graphic framebuffer for ATI Rage128 based devices +on Intel and PPC boxes. + +Advantages: + + * It provides a nice large console (128 cols + 48 lines with 1024x768) + without using tiny, unreadable fonts. + * You can run XF68_FBDev on top of /dev/fb0 + * Most important: boot logo :-) + +Disadvantages: + + * graphic mode is slower than text mode... but you should not notice + if you use same resolution as you used in textmode. + * still experimental. + + +How to use it? +============== + +Switching modes is done using the video=aty128fb:<resolution>... modedb +boot parameter or using `fbset' program. + +See Documentation/fb/modedb.txt for more information on modedb +resolutions. + +You should compile in both vgacon (to boot if you remove your Rage128 from +box) and aty128fb (for graphics mode). You should not compile-in vesafb +unless you have primary display on non-Rage128 VBE2.0 device (see +Documentation/fb/vesafb.txt for details). + + +X11 +=== + +XF68_FBDev should generally work fine, but it is non-accelerated. As of +this document, 8 and 32bpp works fine. There have been palette issues +when switching from X to console and back to X. You will have to restart +X to fix this. + + +Configuration +============= + +You can pass kernel command line options to vesafb with +`video=aty128fb:option1,option2:value2,option3' (multiple options should +be separated by comma, values are separated from options by `:'). +Accepted options: + +noaccel - do not use acceleration engine. It is default. +accel - use acceleration engine. Not finished. +vmode:x - chooses PowerMacintosh video mode <x>. Depreciated. +cmode:x - chooses PowerMacintosh colour mode <x>. Depreciated. +<XxX@X> - selects startup videomode. See modedb.txt for detailed + explanation. Default is 640x480x8bpp. + + +Limitations +=========== + +There are known and unknown bugs, features and misfeatures. +Currently there are following known bugs: + + This driver is still experimental and is not finished. Too many + bugs/errata to list here. + +-- +Brad Douglas <brad@neruo.com> diff --git a/Documentation/fb/cirrusfb.txt b/Documentation/fb/cirrusfb.txt new file mode 100644 index 00000000000..f9436843e99 --- /dev/null +++ b/Documentation/fb/cirrusfb.txt @@ -0,0 +1,97 @@ + + Framebuffer driver for Cirrus Logic chipsets + Copyright 1999 Jeff Garzik <jgarzik@pobox.com> + + + +{ just a little something to get people going; contributors welcome! } + + + +Chip families supported: + SD64 + Piccolo + Picasso + Spectrum + Alpine (GD-543x/4x) + Picasso4 (GD-5446) + GD-5480 + Laguna (GD-546x) + +Bus's supported: + PCI + Zorro + +Architectures supported: + i386 + Alpha + PPC (Motorola Powerstack) + m68k (Amiga) + + + +Default video modes +------------------- +At the moment, there are two kernel command line arguments supported: + +mode:640x480 +mode:800x600 + or +mode:1024x768 + +Full support for startup video modes (modedb) will be integrated soon. + +Version 1.9.9.1 +--------------- +* Fix memory detection for 512kB case +* 800x600 mode +* Fixed timings +* Hint for AXP: Use -accel false -vyres -1 when changing resolution + + +Version 1.9.4.4 +--------------- +* Preliminary Laguna support +* Overhaul color register routines. +* Associated with the above, console colors are now obtained from a LUT + called 'palette' instead of from the VGA registers. This code was + modeled after that in atyfb and matroxfb. +* Code cleanup, add comments. +* Overhaul SR07 handling. +* Bug fixes. + + +Version 1.9.4.3 +--------------- +* Correctly set default startup video mode. +* Do not override ram size setting. Define + CLGEN_USE_HARDCODED_RAM_SETTINGS if you _do_ want to override the RAM + setting. +* Compile fixes related to new 2.3.x IORESOURCE_IO[PORT] symbol changes. +* Use new 2.3.x resource allocation. +* Some code cleanup. + + +Version 1.9.4.2 +--------------- +* Casting fixes. +* Assertions no longer cause an oops on purpose. +* Bug fixes. + + +Version 1.9.4.1 +--------------- +* Add compatibility support. Now requires a 2.1.x, 2.2.x or 2.3.x kernel. + + +Version 1.9.4 +------------- +* Several enhancements, smaller memory footprint, a few bugfixes. +* Requires kernel 2.3.14-pre1 or later. + + +Version 1.9.3 +------------- +* Bundled with kernel 2.3.14-pre1 or later. + + diff --git a/Documentation/fb/framebuffer.txt b/Documentation/fb/framebuffer.txt new file mode 100644 index 00000000000..610e7801207 --- /dev/null +++ b/Documentation/fb/framebuffer.txt @@ -0,0 +1,345 @@ + The Frame Buffer Device + ----------------------- + +Maintained by Geert Uytterhoeven <geert@linux-m68k.org> +Last revised: May 10, 2001 + + +0. Introduction +--------------- + +The frame buffer device provides an abstraction for the graphics hardware. It +represents the frame buffer of some video hardware and allows application +software to access the graphics hardware through a well-defined interface, so +the software doesn't need to know anything about the low-level (hardware +register) stuff. + +The device is accessed through special device nodes, usually located in the +/dev directory, i.e. /dev/fb*. + + +1. User's View of /dev/fb* +-------------------------- + +From the user's point of view, the frame buffer device looks just like any +other device in /dev. It's a character device using major 29; the minor +specifies the frame buffer number. + +By convention, the following device nodes are used (numbers indicate the device +minor numbers): + + 0 = /dev/fb0 First frame buffer + 1 = /dev/fb1 Second frame buffer + ... + 31 = /dev/fb31 32nd frame buffer + +For backwards compatibility, you may want to create the following symbolic +links: + + /dev/fb0current -> fb0 + /dev/fb1current -> fb1 + +and so on... + +The frame buffer devices are also `normal' memory devices, this means, you can +read and write their contents. You can, for example, make a screen snapshot by + + cp /dev/fb0 myfile + +There also can be more than one frame buffer at a time, e.g. if you have a +graphics card in addition to the built-in hardware. The corresponding frame +buffer devices (/dev/fb0 and /dev/fb1 etc.) work independently. + +Application software that uses the frame buffer device (e.g. the X server) will +use /dev/fb0 by default (older software uses /dev/fb0current). You can specify +an alternative frame buffer device by setting the environment variable +$FRAMEBUFFER to the path name of a frame buffer device, e.g. (for sh/bash +users): + + export FRAMEBUFFER=/dev/fb1 + +or (for csh users): + + setenv FRAMEBUFFER /dev/fb1 + +After this the X server will use the second frame buffer. + + +2. Programmer's View of /dev/fb* +-------------------------------- + +As you already know, a frame buffer device is a memory device like /dev/mem and +it has the same features. You can read it, write it, seek to some location in +it and mmap() it (the main usage). The difference is just that the memory that +appears in the special file is not the whole memory, but the frame buffer of +some video hardware. + +/dev/fb* also allows several ioctls on it, by which lots of information about +the hardware can be queried and set. The color map handling works via ioctls, +too. Look into <linux/fb.h> for more information on what ioctls exist and on +which data structures they work. Here's just a brief overview: + + - You can request unchangeable information about the hardware, like name, + organization of the screen memory (planes, packed pixels, ...) and address + and length of the screen memory. + + - You can request and change variable information about the hardware, like + visible and virtual geometry, depth, color map format, timing, and so on. + If you try to change that information, the driver maybe will round up some + values to meet the hardware's capabilities (or return EINVAL if that isn't + possible). + + - You can get and set parts of the color map. Communication is done with 16 + bits per color part (red, green, blue, transparency) to support all + existing hardware. The driver does all the computations needed to apply + it to the hardware (round it down to less bits, maybe throw away + transparency). + +All this hardware abstraction makes the implementation of application programs +easier and more portable. E.g. the X server works completely on /dev/fb* and +thus doesn't need to know, for example, how the color registers of the concrete +hardware are organized. XF68_FBDev is a general X server for bitmapped, +unaccelerated video hardware. The only thing that has to be built into +application programs is the screen organization (bitplanes or chunky pixels +etc.), because it works on the frame buffer image data directly. + +For the future it is planned that frame buffer drivers for graphics cards and +the like can be implemented as kernel modules that are loaded at runtime. Such +a driver just has to call register_framebuffer() and supply some functions. +Writing and distributing such drivers independently from the kernel will save +much trouble... + + +3. Frame Buffer Resolution Maintenance +-------------------------------------- + +Frame buffer resolutions are maintained using the utility `fbset'. It can +change the video mode properties of a frame buffer device. Its main usage is +to change the current video mode, e.g. during boot up in one of your /etc/rc.* +or /etc/init.d/* files. + +Fbset uses a video mode database stored in a configuration file, so you can +easily add your own modes and refer to them with a simple identifier. + + +4. The X Server +--------------- + +The X server (XF68_FBDev) is the most notable application program for the frame +buffer device. Starting with XFree86 release 3.2, the X server is part of +XFree86 and has 2 modes: + + - If the `Display' subsection for the `fbdev' driver in the /etc/XF86Config + file contains a + + Modes "default" + + line, the X server will use the scheme discussed above, i.e. it will start + up in the resolution determined by /dev/fb0 (or $FRAMEBUFFER, if set). You + still have to specify the color depth (using the Depth keyword) and virtual + resolution (using the Virtual keyword) though. This is the default for the + configuration file supplied with XFree86. It's the most simple + configuration, but it has some limitations. + + - Therefore it's also possible to specify resolutions in the /etc/XF86Config + file. This allows for on-the-fly resolution switching while retaining the + same virtual desktop size. The frame buffer device that's used is still + /dev/fb0current (or $FRAMEBUFFER), but the available resolutions are + defined by /etc/XF86Config now. The disadvantage is that you have to + specify the timings in a different format (but `fbset -x' may help). + +To tune a video mode, you can use fbset or xvidtune. Note that xvidtune doesn't +work 100% with XF68_FBDev: the reported clock values are always incorrect. + + +5. Video Mode Timings +--------------------- + +A monitor draws an image on the screen by using an electron beam (3 electron +beams for color models, 1 electron beam for monochrome monitors). The front of +the screen is covered by a pattern of colored phosphors (pixels). If a phosphor +is hit by an electron, it emits a photon and thus becomes visible. + +The electron beam draws horizontal lines (scanlines) from left to right, and +from the top to the bottom of the screen. By modifying the intensity of the +electron beam, pixels with various colors and intensities can be shown. + +After each scanline the electron beam has to move back to the left side of the +screen and to the next line: this is called the horizontal retrace. After the +whole screen (frame) was painted, the beam moves back to the upper left corner: +this is called the vertical retrace. During both the horizontal and vertical +retrace, the electron beam is turned off (blanked). + +The speed at which the electron beam paints the pixels is determined by the +dotclock in the graphics board. For a dotclock of e.g. 28.37516 MHz (millions +of cycles per second), each pixel is 35242 ps (picoseconds) long: + + 1/(28.37516E6 Hz) = 35.242E-9 s + +If the screen resolution is 640x480, it will take + + 640*35.242E-9 s = 22.555E-6 s + +to paint the 640 (xres) pixels on one scanline. But the horizontal retrace +also takes time (e.g. 272 `pixels'), so a full scanline takes + + (640+272)*35.242E-9 s = 32.141E-6 s + +We'll say that the horizontal scanrate is about 31 kHz: + + 1/(32.141E-6 s) = 31.113E3 Hz + +A full screen counts 480 (yres) lines, but we have to consider the vertical +retrace too (e.g. 49 `lines'). So a full screen will take + + (480+49)*32.141E-6 s = 17.002E-3 s + +The vertical scanrate is about 59 Hz: + + 1/(17.002E-3 s) = 58.815 Hz + +This means the screen data is refreshed about 59 times per second. To have a +stable picture without visible flicker, VESA recommends a vertical scanrate of +at least 72 Hz. But the perceived flicker is very human dependent: some people +can use 50 Hz without any trouble, while I'll notice if it's less than 80 Hz. + +Since the monitor doesn't know when a new scanline starts, the graphics board +will supply a synchronization pulse (horizontal sync or hsync) for each +scanline. Similarly it supplies a synchronization pulse (vertical sync or +vsync) for each new frame. The position of the image on the screen is +influenced by the moments at which the synchronization pulses occur. + +The following picture summarizes all timings. The horizontal retrace time is +the sum of the left margin, the right margin and the hsync length, while the +vertical retrace time is the sum of the upper margin, the lower margin and the +vsync length. + + +----------+---------------------------------------------+----------+-------+ + | | ^ | | | + | | |upper_margin | | | + | | „ | | | + +----------###############################################----------+-------+ + | # ^ # | | + | # | # | | + | # | # | | + | # | # | | + | left # | # right | hsync | + | margin # | xres # margin | len | + |<-------->#<---------------+--------------------------->#<-------->|<----->| + | # | # | | + | # | # | | + | # | # | | + | # |yres # | | + | # | # | | + | # | # | | + | # | # | | + | # | # | | + | # | # | | + | # | # | | + | # | # | | + | # | # | | + | # „ # | | + +----------###############################################----------+-------+ + | | ^ | | | + | | |lower_margin | | | + | | „ | | | + +----------+---------------------------------------------+----------+-------+ + | | ^ | | | + | | |vsync_len | | | + | | „ | | | + +----------+---------------------------------------------+----------+-------+ + +The frame buffer device expects all horizontal timings in number of dotclocks +(in picoseconds, 1E-12 s), and vertical timings in number of scanlines. + + +6. Converting XFree86 timing values info frame buffer device timings +-------------------------------------------------------------------- + +An XFree86 mode line consists of the following fields: + "800x600" 50 800 856 976 1040 600 637 643 666 + < name > DCF HR SH1 SH2 HFL VR SV1 SV2 VFL + +The frame buffer device uses the following fields: + + - pixclock: pixel clock in ps (pico seconds) + - left_margin: time from sync to picture + - right_margin: time from picture to sync + - upper_margin: time from sync to picture + - lower_margin: time from picture to sync + - hsync_len: length of horizontal sync + - vsync_len: length of vertical sync + +1) Pixelclock: + xfree: in MHz + fb: in picoseconds (ps) + + pixclock = 1000000 / DCF + +2) horizontal timings: + left_margin = HFL - SH2 + right_margin = SH1 - HR + hsync_len = SH2 - SH1 + +3) vertical timings: + upper_margin = VFL - SV2 + lower_margin = SV1 - VR + vsync_len = SV2 - SV1 + +Good examples for VESA timings can be found in the XFree86 source tree, +under "xc/programs/Xserver/hw/xfree86/doc/modeDB.txt". + + +7. References +------------- + +For more specific information about the frame buffer device and its +applications, please refer to the Linux-fbdev website: + + http://linux-fbdev.sourceforge.net/ + +and to the following documentation: + + - The manual pages for fbset: fbset(8), fb.modes(5) + - The manual pages for XFree86: XF68_FBDev(1), XF86Config(4/5) + - The mighty kernel sources: + o linux/drivers/video/ + o linux/include/linux/fb.h + o linux/include/video/ + + + +8. Mailing list +--------------- + +There are several frame buffer device related mailing lists at SourceForge: + - linux-fbdev-announce@lists.sourceforge.net, for announcements, + - linux-fbdev-user@lists.sourceforge.net, for generic user support, + - linux-fbdev-devel@lists.sourceforge.net, for project developers. + +Point your web browser to http://sourceforge.net/projects/linux-fbdev/ for +subscription information and archive browsing. + + +9. Downloading +-------------- + +All necessary files can be found at + + ftp://ftp.uni-erlangen.de/pub/Linux/LOCAL/680x0/ + +and on its mirrors. + +The latest version of fbset can be found at + + http://home.tvd.be/cr26864/Linux/fbdev/ + + +10. Credits +---------- + +This readme was written by Geert Uytterhoeven, partly based on the original +`X-framebuffer.README' by Roman Hodek and Martin Schaller. Section 6 was +provided by Frank Neumann. + +The frame buffer device abstraction was designed by Martin Schaller. diff --git a/Documentation/fb/intel810.txt b/Documentation/fb/intel810.txt new file mode 100644 index 00000000000..fd68b162e4a --- /dev/null +++ b/Documentation/fb/intel810.txt @@ -0,0 +1,272 @@ +Intel 810/815 Framebuffer driver + Tony Daplas <adaplas@pol.net> + http://i810fb.sourceforge.net + + March 17, 2002 + + First Released: July 2001 +================================================================ + +A. Introduction + This is a framebuffer driver for various Intel 810/815 compatible +graphics devices. These would include: + + Intel 810 + Intel 810E + Intel 810-DC100 + Intel 815 Internal graphics only, 100Mhz FSB + Intel 815 Internal graphics only + Intel 815 Internal graphics and AGP + +B. Features + + - Choice of using Discrete Video Timings, VESA Generalized Timing + Formula, or a framebuffer specific database to set the video mode + + - Supports a variable range of horizontal and vertical resolution, and + vertical refresh rates if the VESA Generalized Timing Formula is + enabled. + + - Supports color depths of 8, 16, 24 and 32 bits per pixel + + - Supports pseudocolor, directcolor, or truecolor visuals + + - Full and optimized hardware acceleration at 8, 16 and 24 bpp + + - Robust video state save and restore + + - MTRR support + + - Utilizes user-entered monitor specifications to automatically + calculate required video mode parameters. + + - Can concurrently run with xfree86 running with native i810 drivers + + - Hardware Cursor Support + +C. List of available options + + a. "video=i810fb" + enables the i810 driver + + Recommendation: required + + b. "xres:<value>" + select horizontal resolution in pixels + + Recommendation: user preference + (default = 640) + + c. "yres:<value>" + select vertical resolution in scanlines. If Discrete Video Timings + is enabled, this will be ignored and computed as 3*xres/4. + + Recommendation: user preference + (default = 480) + + d. "vyres:<value>" + select virtual vertical resolution in scanlines. If (0) or none + is specified, this will be computed against maximum available memory. + + Recommendation: do not set + (default = 480) + + e. "vram:<value>" + select amount of system RAM in MB to allocate for the video memory + + Recommendation: 1 - 4 MB. + (default = 4) + + f. "bpp:<value>" + select desired pixel depth + + Recommendation: 8 + (default = 8) + + g. "hsync1/hsync2:<value>" + select the minimum and maximum Horizontal Sync Frequency of the + monitor in KHz. If a using a fixed frequency monitor, hsync1 must + be equal to hsync2. + + Recommendation: check monitor manual for correct values + default (29/30) + + h. "vsync1/vsync2:<value>" + select the minimum and maximum Vertical Sync Frequency of the monitor + in Hz. You can also use this option to lock your monitor's refresh + rate. + + Recommendation: check monitor manual for correct values + (default = 60/60) + + IMPORTANT: If you need to clamp your timings, try to give some + leeway for computational errors (over/underflows). Example: if + using vsync1/vsync2 = 60/60, make sure hsync1/hsync2 has at least + a 1 unit difference, and vice versa. + + i. "voffset:<value>" + select at what offset in MB of the logical memory to allocate the + framebuffer memory. The intent is to avoid the memory blocks + used by standard graphics applications (XFree86). The default + offset (16 MB for a 64MB aperture, 8 MB for a 32MB aperture) will + avoid XFree86's usage and allows up to 7MB/15MB of framebuffer + memory. Depending on your usage, adjust the value up or down, + (0 for maximum usage, 31/63 MB for the least amount). Note, an + arbitrary setting may conflict with XFree86. + + Recommendation: do not set + (default = 8 or 16 MB) + + j. "accel" + enable text acceleration. This can be enabled/reenabled anytime + by using 'fbset -accel true/false'. + + Recommendation: enable + (default = not set) + + k. "mtrr" + enable MTRR. This allows data transfers to the framebuffer memory + to occur in bursts which can significantly increase performance. + Not very helpful with the i810/i815 because of 'shared memory'. + + Recommendation: do not set + (default = not set) + + l. "extvga" + if specified, secondary/external VGA output will always be enabled. + Useful if the BIOS turns off the VGA port when no monitor is attached. + The external VGA monitor can then be attached without rebooting. + + Recommendation: do not set + (default = not set) + + m. "sync" + Forces the hardware engine to do a "sync" or wait for the hardware + to finish before starting another instruction. This will produce a + more stable setup, but will be slower. + + Recommendation: do not set + (default = not set) + + n. "dcolor" + Use directcolor visual instead of truecolor for pixel depths greater + than 8 bpp. Useful for color tuning, such as gamma control. + + Recommendation: do not set + (default = not set) + +D. Kernel booting + +Separate each option/option-pair by commas (,) and the option from its value +with a colon (:) as in the following: + +video=i810fb:option1,option2:value2 + +Sample Usage +------------ + +In /etc/lilo.conf, add the line: + +append="video=i810fb:vram:2,xres:1024,yres:768,bpp:8,hsync1:30,hsync2:55, \ + vsync1:50,vsync2:85,accel,mtrr" + +This will initialize the framebuffer to 1024x768 at 8bpp. The framebuffer +will use 2 MB of System RAM. MTRR support will be enabled. The refresh rate +will be computed based on the hsync1/hsync2 and vsync1/vsync2 values. + +IMPORTANT: +You must include hsync1, hsync2, vsync1 and vsync2 to enable video modes +better than 640x480 at 60Hz. + +E. Module options + + The module parameters are essentially similar to the kernel +parameters. The main difference is that you need to include a Boolean value +(1 for TRUE, and 0 for FALSE) for those options which don't need a value. + +Example, to enable MTRR, include "mtrr=1". + +Sample Usage +------------ + +Using the same setup as described above, load the module like this: + + modprobe i810fb vram=2 xres=1024 bpp=8 hsync1=30 hsync2=55 vsync1=50 \ + vsync2=85 accel=1 mtrr=1 + +Or just add the following to /etc/modprobe.conf + + options i810fb vram=2 xres=1024 bpp=16 hsync1=30 hsync2=55 vsync1=50 \ + vsync2=85 accel=1 mtrr=1 + +and just do a + + modprobe i810fb + + +F. Setup + + a. Do your usual method of configuring the kernel. + + make menuconfig/xconfig/config + + b. Under "Code Maturity Options", enable "Prompt for experimental/ + incomplete code/drivers". + + c. Enable agpgart support for the Intel 810/815 on-board graphics. + This is required. The option is under "Character Devices" + + d. Under "Graphics Support", select "Intel 810/815" either statically + or as a module. Choose "use VESA GTF for video timings" if you + need to maximize the capability of your display. To be on the + safe side, you can leave this unselected. + + e. If you want a framebuffer console, enable it under "Console + Drivers" + + f. Compile your kernel. + + g. Load the driver as described in section D and E. + + Optional: + h. If you are going to run XFree86 with its native drivers, the + standard XFree86 4.1.0 and 4.2.0 drivers should work as is. + However, there's a bug in the XFree86 i810 drivers. It attempts + to use XAA even when switched to the console. This will crash + your server. I have a fix at this site: + + http://i810fb.sourceforge.net. + + You can either use the patch, or just replace + + /usr/X11R6/lib/modules/drivers/i810_drv.o + + with the one provided at the website. + + i. Try the DirectFB (http://www.directfb.org) + the i810 gfxdriver + patch to see the chipset in action (or inaction :-). + +G. Acknowledgment: + + 1. Geert Uytterhoeven - his excellent howto and the virtual + framebuffer driver code made this possible. + + 2. Jeff Hartmann for his agpgart code. + + 3. The X developers. Insights were provided just by reading the + XFree86 source code. + + 4. Intel(c). For this value-oriented chipset driver and for + providing documentation. + + 5. Matt Sottek. His inputs and ideas helped in making some + optimizations possible. + +H. Home Page: + + A more complete, and probably updated information is provided at +http://i810fb.sourceforge.net. + +########################### +Tony + diff --git a/Documentation/fb/internals.txt b/Documentation/fb/internals.txt new file mode 100644 index 00000000000..9b2a2b2f3e5 --- /dev/null +++ b/Documentation/fb/internals.txt @@ -0,0 +1,82 @@ + +This is a first start for some documentation about frame buffer device +internals. + +Geert Uytterhoeven <geert@linux-m68k.org>, 21 July 1998 +James Simmons <jsimmons@user.sf.net>, Nov 26 2002 + +-------------------------------------------------------------------------------- + + *** STRUCTURES USED BY THE FRAME BUFFER DEVICE API *** + +The following structures play a role in the game of frame buffer devices. They +are defined in <linux/fb.h>. + +1. Outside the kernel (user space) + + - struct fb_fix_screeninfo + + Device independent unchangeable information about a frame buffer device and + a specific video mode. This can be obtained using the FBIOGET_FSCREENINFO + ioctl. + + - struct fb_var_screeninfo + + Device independent changeable information about a frame buffer device and a + specific video mode. This can be obtained using the FBIOGET_VSCREENINFO + ioctl, and updated with the FBIOPUT_VSCREENINFO ioctl. If you want to pan + the screen only, you can use the FBIOPAN_DISPLAY ioctl. + + - struct fb_cmap + + Device independent colormap information. You can get and set the colormap + using the FBIOGETCMAP and FBIOPUTCMAP ioctls. + + +2. Inside the kernel + + - struct fb_info + + Generic information, API and low level information about a specific frame + buffer device instance (slot number, board address, ...). + + - struct `par' + + Device dependent information that uniquely defines the video mode for this + particular piece of hardware. + + +-------------------------------------------------------------------------------- + + *** VISUALS USED BY THE FRAME BUFFER DEVICE API *** + + +Monochrome (FB_VISUAL_MONO01 and FB_VISUAL_MONO10) +------------------------------------------------- +Each pixel is either black or white. + + +Pseudo color (FB_VISUAL_PSEUDOCOLOR and FB_VISUAL_STATIC_PSEUDOCOLOR) +--------------------------------------------------------------------- +The whole pixel value is fed through a programmable lookup table that has one +color (including red, green, and blue intensities) for each possible pixel +value, and that color is displayed. + + +True color (FB_VISUAL_TRUECOLOR) +-------------------------------- +The pixel value is broken up into red, green, and blue fields. + + +Direct color (FB_VISUAL_DIRECTCOLOR) +------------------------------------ +The pixel value is broken up into red, green, and blue fields, each of which +are looked up in separate red, green, and blue lookup tables. + + +Grayscale displays +------------------ +Grayscale and static grayscale are special variants of pseudo color and static +pseudo color, where the red, green and blue components are always equal to +each other. + diff --git a/Documentation/fb/matroxfb.txt b/Documentation/fb/matroxfb.txt new file mode 100644 index 00000000000..ad7a67707d6 --- /dev/null +++ b/Documentation/fb/matroxfb.txt @@ -0,0 +1,415 @@ +[This file is cloned from VesaFB. Thanks go to Gerd Knorr] + +What is matroxfb? +================= + +This is a driver for a graphic framebuffer for Matrox devices on +Alpha, Intel and PPC boxes. + +Advantages: + + * It provides a nice large console (128 cols + 48 lines with 1024x768) + without using tiny, unreadable fonts. + * You can run XF{68,86}_FBDev or XFree86 fbdev driver on top of /dev/fb0 + * Most important: boot logo :-) + +Disadvantages: + + * graphic mode is slower than text mode... but you should not notice + if you use same resolution as you used in textmode. + + +How to use it? +============== + +Switching modes is done using the video=matroxfb:vesa:... boot parameter +or using `fbset' program. + +If you want, for example, enable a resolution of 1280x1024x24bpp you should +pass to the kernel this command line: "video=matroxfb:vesa:0x1BB". + +You should compile in both vgacon (to boot if you remove you Matrox from +box) and matroxfb (for graphics mode). You should not compile-in vesafb +unless you have primary display on non-Matrox VBE2.0 device (see +Documentation/fb/vesafb.txt for details). + +Currently supported video modes are (through vesa:... interface, PowerMac +has [as addon] compatibility code): + + +[Graphic modes] + +bpp | 640x400 640x480 768x576 800x600 960x720 +----+-------------------------------------------- + 4 | 0x12 0x102 + 8 | 0x100 0x101 0x180 0x103 0x188 + 15 | 0x110 0x181 0x113 0x189 + 16 | 0x111 0x182 0x114 0x18A + 24 | 0x1B2 0x184 0x1B5 0x18C + 32 | 0x112 0x183 0x115 0x18B + + +[Graphic modes (continued)] + +bpp | 1024x768 1152x864 1280x1024 1408x1056 1600x1200 +----+------------------------------------------------ + 4 | 0x104 0x106 + 8 | 0x105 0x190 0x107 0x198 0x11C + 15 | 0x116 0x191 0x119 0x199 0x11D + 16 | 0x117 0x192 0x11A 0x19A 0x11E + 24 | 0x1B8 0x194 0x1BB 0x19C 0x1BF + 32 | 0x118 0x193 0x11B 0x19B + + +[Text modes] + +text | 640x400 640x480 1056x344 1056x400 1056x480 +-----+------------------------------------------------ + 8x8 | 0x1C0 0x108 0x10A 0x10B 0x10C +8x16 | 2, 3, 7 0x109 + +You can enter these number either hexadecimal (leading `0x') or decimal +(0x100 = 256). You can also use value + 512 to achieve compatibility +with your old number passed to vesafb. + +Non-listed number can be achieved by more complicated command-line, for +example 1600x1200x32bpp can be specified by `video=matroxfb:vesa:0x11C,depth:32'. + + +X11 +=== + +XF{68,86}_FBDev should work just fine, but it is non-accelerated. On non-intel +architectures there are some glitches for 24bpp videomodes. 8, 16 and 32bpp +works fine. + +Running another (accelerated) X-Server like XF86_SVGA works too. But (at least) +XFree servers have big troubles in multihead configurations (even on first +head, not even talking about second). Running XFree86 4.x accelerated mga +driver is possible, but you must not enable DRI - if you do, resolution and +color depth of your X desktop must match resolution and color depths of your +virtual consoles, otherwise X will corrupt accelerator settings. + + +SVGALib +======= + +Driver contains SVGALib compatibility code. It is turned on by choosing textual +mode for console. You can do it at boot time by using videomode +2,3,7,0x108-0x10C or 0x1C0. At runtime, `fbset -depth 0' does this work. +Unfortunately, after SVGALib application exits, screen contents is corrupted. +Switching to another console and back fixes it. I hope that it is SVGALib's +problem and not mine, but I'm not sure. + + +Configuration +============= + +You can pass kernel command line options to matroxfb with +`video=matroxfb:option1,option2:value2,option3' (multiple options should be +separated by comma, values are separated from options by `:'). +Accepted options: + +mem:X - size of memory (X can be in megabytes, kilobytes or bytes) + You can only decrease value determined by driver because of + it always probe for memory. Default is to use whole detected + memory usable for on-screen display (i.e. max. 8 MB). +disabled - do not load driver; you can use also `off', but `disabled' + is here too. +enabled - load driver, if you have `video=matroxfb:disabled' in LILO + configuration, you can override it by this (you cannot override + `off'). It is default. +noaccel - do not use acceleration engine. It does not work on Alphas. +accel - use acceleration engine. It is default. +nopan - create initial consoles with vyres = yres, thus disabling virtual + scrolling. +pan - create initial consoles as tall as possible (vyres = memory/vxres). + It is default. +nopciretry - disable PCI retries. It is needed for some broken chipsets, + it is autodetected for intel's 82437. In this case device does + not comply to PCI 2.1 specs (it will not guarantee that every + transaction terminate with success or retry in 32 PCLK). +pciretry - enable PCI retries. It is default, except for intel's 82437. +novga - disables VGA I/O ports. It is default if BIOS did not enable device. + You should not use this option, some boards then do not restart + without power off. +vga - preserve state of VGA I/O ports. It is default. Driver does not + enable VGA I/O if BIOS did not it (it is not safe to enable it in + most cases). +nobios - disables BIOS ROM. It is default if BIOS did not enable BIOS itself. + You should not use this option, some boards then do not restart + without power off. +bios - preserve state of BIOS ROM. It is default. Driver does not enable + BIOS if BIOS was not enabled before. +noinit - tells driver, that devices were already initialized. You should use + it if you have G100 and/or if driver cannot detect memory, you see + strange pattern on screen and so on. Devices not enabled by BIOS + are still initialized. It is default. +init - driver initializes every device it knows about. +memtype - specifies memory type, implies 'init'. This is valid only for G200 + and G400 and has following meaning: + G200: 0 -> 2x128Kx32 chips, 2MB onboard, probably sgram + 1 -> 2x128Kx32 chips, 4MB onboard, probably sgram + 2 -> 2x256Kx32 chips, 4MB onboard, probably sgram + 3 -> 2x256Kx32 chips, 8MB onboard, probably sgram + 4 -> 2x512Kx16 chips, 8/16MB onboard, probably sdram only + 5 -> same as above + 6 -> 4x128Kx32 chips, 4MB onboard, probably sgram + 7 -> 4x128Kx32 chips, 8MB onboard, probably sgram + G400: 0 -> 2x512Kx16 SDRAM, 16/32MB + 2x512Kx32 SGRAM, 16/32MB + 1 -> 2x256Kx32 SGRAM, 8/16MB + 2 -> 4x128Kx32 SGRAM, 8/16MB + 3 -> 4x512Kx32 SDRAM, 32MB + 4 -> 4x256Kx32 SGRAM, 16/32MB + 5 -> 2x1Mx32 SDRAM, 32MB + 6 -> reserved + 7 -> reserved + You should use sdram or sgram parameter in addition to memtype + parameter. +nomtrr - disables write combining on frame buffer. This slows down driver but + there is reported minor incompatibility between GUS DMA and XFree + under high loads if write combining is enabled (sound dropouts). +mtrr - enables write combining on frame buffer. It speeds up video accesses + much. It is default. You must have MTRR support enabled in kernel + and your CPU must have MTRR (f.e. Pentium II have them). +sgram - tells to driver that you have Gxx0 with SGRAM memory. It has no + effect without `init'. +sdram - tells to driver that you have Gxx0 with SDRAM memory. + It is a default. +inv24 - change timings parameters for 24bpp modes on Millenium and + Millenium II. Specify this if you see strange color shadows around + characters. +noinv24 - use standard timings. It is the default. +inverse - invert colors on screen (for LCD displays) +noinverse - show true colors on screen. It is default. +dev:X - bind driver to device X. Driver numbers device from 0 up to N, + where device 0 is first `known' device found, 1 second and so on. + lspci lists devices in this order. + Default is `every' known device for driver with multihead support + and first working device (usually dev:0) for driver without + multihead support. +nohwcursor - disables hardware cursor (use software cursor instead). +hwcursor - enables hardware cursor. It is default. If you are using + non-accelerated mode (`noaccel' or `fbset -accel false'), software + cursor is used (except for text mode). +noblink - disables cursor blinking. Cursor in text mode always blinks (hw + limitation). +blink - enables cursor blinking. It is default. +nofastfont - disables fastfont feature. It is default. +fastfont:X - enables fastfont feature. X specifies size of memory reserved for + font data, it must be >= (fontwidth*fontheight*chars_in_font)/8. + It is faster on Gx00 series, but slower on older cards. +grayscale - enable grayscale summing. It works in PSEUDOCOLOR modes (text, + 4bpp, 8bpp). In DIRECTCOLOR modes it is limited to characters + displayed through putc/putcs. Direct accesses to framebuffer + can paint colors. +nograyscale - disable grayscale summing. It is default. +cross4MB - enables that pixel line can cross 4MB boundary. It is default for + non-Millenium. +nocross4MB - pixel line must not cross 4MB boundary. It is default for + Millenium I or II, because of these devices have hardware + limitations which do not allow this. But this option is + incompatible with some (if not all yet released) versions of + XF86_FBDev. +dfp - enables digital flat panel interface. This option is incompatible with + secondary (TV) output - if DFP is active, TV output must be + inactive and vice versa. DFP always uses same timing as primary + (monitor) output. +dfp:X - use settings X for digital flat panel interface. X is number from + 0 to 0xFF, and meaning of each individual bit is described in + G400 manual, in description of DAC register 0x1F. For normal operation + you should set all bits to zero, except lowest bit. This lowest bit + selects who is source of display clocks, whether G400, or panel. + Default value is now read back from hardware - so you should specify + this value only if you are also using `init' parameter. +outputs:XYZ - set mapping between CRTC and outputs. Each letter can have value + of 0 (for no CRTC), 1 (CRTC1) or 2 (CRTC2), and first letter corresponds + to primary analog output, second letter to the secondary analog output + and third letter to the DVI output. Default setting is 100 for + cards below G400 or G400 without DFP, 101 for G400 with DFP, and + 111 for G450 and G550. You can set mapping only on first card, + use matroxset for setting up other devices. +vesa:X - selects startup videomode. X is number from 0 to 0x1FF, see table + above for detailed explanation. Default is 640x480x8bpp if driver + has 8bpp support. Otherwise first available of 640x350x4bpp, + 640x480x15bpp, 640x480x24bpp, 640x480x32bpp or 80x25 text + (80x25 text is always available). + +If you are not satisfied with videomode selected by `vesa' option, you +can modify it with these options: + +xres:X - horizontal resolution, in pixels. Default is derived from `vesa' + option. +yres:X - vertical resolution, in pixel lines. Default is derived from `vesa' + option. +upper:X - top boundary: lines between end of VSYNC pulse and start of first + pixel line of picture. Default is derived from `vesa' option. +lower:X - bottom boundary: lines between end of picture and start of VSYNC + pulse. Default is derived from `vesa' option. +vslen:X - length of VSYNC pulse, in lines. Default is derived from `vesa' + option. +left:X - left boundary: pixels between end of HSYNC pulse and first pixel. + Default is derived from `vesa' option. +right:X - right boundary: pixels between end of picture and start of HSYNC + pulse. Default is derived from `vesa' option. +hslen:X - length of HSYNC pulse, in pixels. Default is derived from `vesa' + option. +pixclock:X - dotclocks, in ps (picoseconds). Default is derived from `vesa' + option and from `fh' and `fv' options. +sync:X - sync. pulse - bit 0 inverts HSYNC polarity, bit 1 VSYNC polarity. + If bit 3 (value 0x08) is set, composite sync instead of HSYNC is + generated. If bit 5 (value 0x20) is set, sync on green is turned on. + Do not forget that if you want sync on green, you also probably + want composite sync. + Default depends on `vesa'. +depth:X - Bits per pixel: 0=text, 4,8,15,16,24 or 32. Default depends on + `vesa'. + +If you know capabilities of your monitor, you can specify some (or all) of +`maxclk', `fh' and `fv'. In this case, `pixclock' is computed so that +pixclock <= maxclk, real_fh <= fh and real_fv <= fv. + +maxclk:X - maximum dotclock. X can be specified in MHz, kHz or Hz. Default is + `don't care'. +fh:X - maximum horizontal synchronization frequency. X can be specified + in kHz or Hz. Default is `don't care'. +fv:X - maximum vertical frequency. X must be specified in Hz. Default is + 70 for modes derived from `vesa' with yres <= 400, 60Hz for + yres > 400. + + +Limitations +=========== + +There are known and unknown bugs, features and misfeatures. +Currently there are following known bugs: + + SVGALib does not restore screen on exit + + generic fbcon-cfbX procedures do not work on Alphas. Due to this, + `noaccel' (and cfb4 accel) driver does not work on Alpha. So everyone + with access to /dev/fb* on Alpha can hang machine (you should restrict + access to /dev/fb* - everyone with access to this device can destroy + your monitor, believe me...). + + 24bpp does not support correctly XF-FBDev on big-endian architectures. + + interlaced text mode is not supported; it looks like hardware limitation, + but I'm not sure. + + Gxx0 SGRAM/SDRAM is not autodetected. + + If you are using more than one framebuffer device, you must boot kernel + with 'video=scrollback:0'. + + maybe more... +And following misfeatures: + + SVGALib does not restore screen on exit. + + pixclock for text modes is limited by hardware to + 83 MHz on G200 + 66 MHz on Millennium I + 60 MHz on Millennium II + Because I have no access to other devices, I do not know specific + frequencies for them. So driver does not check this and allows you to + set frequency higher that this. It causes sparks, black holes and other + pretty effects on screen. Device was not destroyed during tests. :-) + + my Millennium G200 oscillator has frequency range from 35 MHz to 380 MHz + (and it works with 8bpp on about 320 MHz dotclocks (and changed mclk)). + But Matrox says on product sheet that VCO limit is 50-250 MHz, so I believe + them (maybe that chip overheats, but it has a very big cooler (G100 has + none), so it should work). + + special mixed video/graphics videomodes of Mystique and Gx00 - 2G8V16 and + G16V16 are not supported + + color keying is not supported + + feature connector of Mystique and Gx00 is set to VGA mode (it is disabled + by BIOS) + + DDC (monitor detection) is supported through dualhead driver + + some check for input values are not so strict how it should be (you can + specify vslen=4000 and so on). + + maybe more... +And following features: + + 4bpp is available only on Millennium I and Millennium II. It is hardware + limitation. + + selection between 1:5:5:5 and 5:6:5 16bpp videomode is done by -rgba + option of fbset: "fbset -depth 16 -rgba 5,5,5" selects 1:5:5:5, anything + else selects 5:6:5 mode. + + text mode uses 6 bit VGA palette instead of 8 bit (one of 262144 colors + instead of one of 16M colors). It is due to hardware limitation of + Millennium I/II and SVGALib compatibility. + + +Benchmarks +========== +It is time to redraw whole screen 1000 times in 1024x768, 60Hz. It is +time for draw 6144000 characters on screen through /dev/vcsa +(for 32bpp it is about 3GB of data (exactly 3000 MB); for 8x16 font in +16 seconds, i.e. 187 MBps). +Times were obtained from one older version of driver, now they are about 3% +faster, it is kernel-space only time on P-II/350 MHz, Millennium I in 33 MHz +PCI slot, G200 in AGP 2x slot. I did not test vgacon. + +NOACCEL + 8x16 12x22 + Millennium I G200 Millennium I G200 +8bpp 16.42 9.54 12.33 9.13 +16bpp 21.00 15.70 19.11 15.02 +24bpp 36.66 36.66 35.00 35.00 +32bpp 35.00 30.00 33.85 28.66 + +ACCEL, nofastfont + 8x16 12x22 6x11 + Millennium I G200 Millennium I G200 Millennium I G200 +8bpp 7.79 7.24 13.55 7.78 30.00 21.01 +16bpp 9.13 7.78 16.16 7.78 30.00 21.01 +24bpp 14.17 10.72 18.69 10.24 34.99 21.01 +32bpp 16.15 16.16 18.73 13.09 34.99 21.01 + +ACCEL, fastfont + 8x16 12x22 6x11 + Millennium I G200 Millennium I G200 Millennium I G200 +8bpp 8.41 6.01 6.54 4.37 16.00 10.51 +16bpp 9.54 9.12 8.76 6.17 17.52 14.01 +24bpp 15.00 12.36 11.67 10.00 22.01 18.32 +32bpp 16.18 18.29* 12.71 12.74 24.44 21.00 + +TEXT + 8x16 + Millennium I G200 +TEXT 3.29 1.50 + +* Yes, it is slower than Millennium I. + + +Dualhead G400 +============= +Driver supports dualhead G400 with some limitations: + + secondary head shares videomemory with primary head. It is not problem + if you have 32MB of videoram, but if you have only 16MB, you may have + to think twice before choosing videomode (for example twice 1880x1440x32bpp + is not possible). + + due to hardware limitation, secondary head can use only 16 and 32bpp + videomodes. + + secondary head is not accelerated. There were bad problems with accelerated + XFree when secondary head used to use acceleration. + + secondary head always powerups in 640x480@60-32 videomode. You have to use + fbset to change this mode. + + secondary head always powerups in monitor mode. You have to use fbmatroxset + to change it to TV mode. Also, you must select at least 525 lines for + NTSC output and 625 lines for PAL output. + + kernel is not fully multihead ready. So some things are impossible to do. + + if you compiled it as module, you must insert i2c-matroxfb, matroxfb_maven + and matroxfb_crtc2 into kernel. + + +Dualhead G450 +============= +Driver supports dualhead G450 with some limitations: + + secondary head shares videomemory with primary head. It is not problem + if you have 32MB of videoram, but if you have only 16MB, you may have + to think twice before choosing videomode. + + due to hardware limitation, secondary head can use only 16 and 32bpp + videomodes. + + secondary head is not accelerated. + + secondary head always powerups in 640x480@60-32 videomode. You have to use + fbset to change this mode. + + TV output is not supported + + kernel is not fully multihead ready, so some things are impossible to do. + + if you compiled it as module, you must insert matroxfb_g450 and matroxfb_crtc2 + into kernel. + +-- +Petr Vandrovec <vandrove@vc.cvut.cz> diff --git a/Documentation/fb/modedb.txt b/Documentation/fb/modedb.txt new file mode 100644 index 00000000000..e04458b319d --- /dev/null +++ b/Documentation/fb/modedb.txt @@ -0,0 +1,61 @@ + + + modedb default video mode support + + +Currently all frame buffer device drivers have their own video mode databases, +which is a mess and a waste of resources. The main idea of modedb is to have + + - one routine to probe for video modes, which can be used by all frame buffer + devices + - one generic video mode database with a fair amount of standard videomodes + (taken from XFree86) + - the possibility to supply your own mode database for graphics hardware that + needs non-standard modes, like amifb and Mac frame buffer drivers (which + use macmodes.c) + +When a frame buffer device receives a video= option it doesn't know, it should +consider that to be a video mode option. If no frame buffer device is specified +in a video= option, fbmem considers that to be a global video mode option. + +Valid mode specifiers (mode_option argument): + + <xres>x<yres>[-<bpp>][@<refresh>] + <name>[-<bpp>][@<refresh>] + +with <xres>, <yres>, <bpp> and <refresh> decimal numbers and <name> a string. +Things between square brackets are optional. + +To find a suitable video mode, you just call + +int __init fb_find_mode(struct fb_var_screeninfo *var, + struct fb_info *info, const char *mode_option, + const struct fb_videomode *db, unsigned int dbsize, + const struct fb_videomode *default_mode, + unsigned int default_bpp) + +with db/dbsize your non-standard video mode database, or NULL to use the +standard video mode database. + +fb_find_mode() first tries the specified video mode (or any mode that matches, +e.g. there can be multiple 640x480 modes, each of them is tried). If that +fails, the default mode is tried. If that fails, it walks over all modes. + +To specify a video mode at bootup, use the following boot options: + video=<driver>:<xres>x<yres>[-<bpp>][@refresh] + +where <driver> is a name from the table below. Valid default modes can be +found in linux/drivers/video/modedb.c. Check your driver's documentation. +There may be more modes. + + Drivers that support modedb boot options + Boot Name Cards Supported + + amifb - Amiga chipset frame buffer + aty128fb - ATI Rage128 / Pro frame buffer + atyfb - ATI Mach64 frame buffer + tdfxfb - 3D Fx frame buffer + tridentfb - Trident (Cyber)blade chipset frame buffer + +BTW, only a few drivers use this at the moment. Others are to follow +(feel free to send patches). diff --git a/Documentation/fb/pvr2fb.txt b/Documentation/fb/pvr2fb.txt new file mode 100644 index 00000000000..2bf6c2321c2 --- /dev/null +++ b/Documentation/fb/pvr2fb.txt @@ -0,0 +1,61 @@ +$Id: pvr2fb.txt,v 1.1 2001/05/24 05:09:16 mrbrown Exp $ + +What is pvr2fb? +=============== + +This is a driver for PowerVR 2 based graphics frame buffers, such as the +one found in the Dreamcast. + +Advantages: + + * It provides a nice large console (128 cols + 48 lines with 1024x768) + without using tiny, unreadable fonts. + * You can run XF86_FBDev on top of /dev/fb0 + * Most important: boot logo :-) + +Disadvantages: + + * Driver is currently limited to the Dreamcast PowerVR 2 implementation + at the time of this writing. + +Configuration +============= + +You can pass kernel command line options to pvr2fb with +`video=pvr2fb:option1,option2:value2,option3' (multiple options should be +separated by comma, values are separated from options by `:'). +Accepted options: + +font:X - default font to use. All fonts are supported, including the + SUN12x22 font which is very nice at high resolutions. + +mode:X - default video mode. The following video modes are supported: + 640x240-60, 640x480-60. + + Note: the 640x240 mode is currently broken, and should not be + used for any reason. It is only mentioned as a reference. + +inverse - invert colors on screen (for LCD displays) + +nomtrr - disables write combining on frame buffer. This slows down driver + but there is reported minor incompatibility between GUS DMA and + XFree under high loads if write combining is enabled (sound + dropouts). MTRR is enabled by default on systems that have it + configured and that support it. + +cable:X - cable type. This can be any of the following: vga, rgb, and + composite. If none is specified, we guess. + +output:X - output type. This can be any of the following: pal, ntsc, and + vga. If none is specified, we guess. + +X11 +=== + +XF86_FBDev should work, in theory. At the time of this writing it is +totally untested and may or may not even portray the beginnings of +working. If you end up testing this, please let me know! + +-- +Paul Mundt <lethal@linuxdc.org> + diff --git a/Documentation/fb/pxafb.txt b/Documentation/fb/pxafb.txt new file mode 100644 index 00000000000..db9b8500b43 --- /dev/null +++ b/Documentation/fb/pxafb.txt @@ -0,0 +1,54 @@ +Driver for PXA25x LCD controller +================================ + +The driver supports the following options, either via +options=<OPTIONS> when modular or video=pxafb:<OPTIONS> when built in. + +For example: + modprobe pxafb options=mode:640x480-8,passive +or on the kernel command line + video=pxafb:mode:640x480-8,passive + +mode:XRESxYRES[-BPP] + XRES == LCCR1_PPL + 1 + YRES == LLCR2_LPP + 1 + The resolution of the display in pixels + BPP == The bit depth. Valid values are 1, 2, 4, 8 and 16. + +pixclock:PIXCLOCK + Pixel clock in picoseconds + +left:LEFT == LCCR1_BLW + 1 +right:RIGHT == LCCR1_ELW + 1 +hsynclen:HSYNC == LCCR1_HSW + 1 +upper:UPPER == LCCR2_BFW +lower:LOWER == LCCR2_EFR +vsynclen:VSYNC == LCCR2_VSW + 1 + Display margins and sync times + +color | mono => LCCR0_CMS + umm... + +active | passive => LCCR0_PAS + Active (TFT) or Passive (STN) display + +single | dual => LCCR0_SDS + Single or dual panel passive display + +4pix | 8pix => LCCR0_DPD + 4 or 8 pixel monochrome single panel data + +hsync:HSYNC +vsync:VSYNC + Horizontal and vertical sync. 0 => active low, 1 => active + high. + +dpc:DPC + Double pixel clock. 1=>true, 0=>false + +outputen:POLARITY + Output Enable Polarity. 0 => active low, 1 => active high + +pixclockpol:POLARITY + pixel clock polarity + 0 => falling edge, 1 => rising edge diff --git a/Documentation/fb/sa1100fb.txt b/Documentation/fb/sa1100fb.txt new file mode 100644 index 00000000000..f1b4220464d --- /dev/null +++ b/Documentation/fb/sa1100fb.txt @@ -0,0 +1,39 @@ +[This file is cloned from VesaFB/matroxfb] + +What is sa1100fb? +================= + +This is a driver for a graphic framebuffer for the SA-1100 LCD +controller. + +Configuration +============== + +For most common passive displays, giving the option + +video=sa1100fb:bpp:<value>,lccr0:<value>,lccr1:<value>,lccr2:<value>,lccr3:<value> + +on the kernel command line should be enough to configure the +controller. The bits per pixel (bpp) value should be 4, 8, 12, or +16. LCCR values are display-specific and should be computed as +documented in the SA-1100 Developer's Manual, Section 11.7. Dual-panel +displays are supported as long as the SDS bit is set in LCCR0; GPIO<9:2> +are used for the lower panel. + +For active displays or displays requiring additional configuration +(controlling backlights, powering on the LCD, etc.), the command line +options may not be enough to configure the display. Adding sections to +sa1100fb_init_fbinfo(), sa1100fb_activate_var(), +sa1100fb_disable_lcd_controller(), and sa1100fb_enable_lcd_controller() +will probably be necessary. + +Accepted options: + +bpp:<value> Configure for <value> bits per pixel +lccr0:<value> Configure LCD control register 0 (11.7.3) +lccr1:<value> Configure LCD control register 1 (11.7.4) +lccr2:<value> Configure LCD control register 2 (11.7.5) +lccr3:<value> Configure LCD control register 3 (11.7.6) + +-- +Mark Huang <mhuang@livetoy.com> diff --git a/Documentation/fb/sisfb.txt b/Documentation/fb/sisfb.txt new file mode 100644 index 00000000000..3b50c517a08 --- /dev/null +++ b/Documentation/fb/sisfb.txt @@ -0,0 +1,158 @@ + +What is sisfb? +============== + +sisfb is a framebuffer device driver for SiS (Silicon Integrated Systems) +graphics chips. Supported are: + +- SiS 300 series: SiS 300/305, 540, 630(S), 730(S) +- SiS 315 series: SiS 315/H/PRO, 55x, (M)65x, 740, (M)661(F/M)X, (M)741(GX) +- SiS 330 series: SiS 330 ("Xabre"), (M)760 + + +Why do I need a framebuffer driver? +=================================== + +sisfb is eg. useful if you want a high-resolution text console. Besides that, +sisfb is required to run DirectFB (which comes with an additional, dedicated +driver for the 315 series). + +On the 300 series, sisfb on kernels older than 2.6.3 furthermore plays an +important role in connection with DRM/DRI: Sisfb manages the memory heap +used by DRM/DRI for 3D texture and other data. This memory management is +required for using DRI/DRM. + +Kernels >= around 2.6.3 do not need sisfb any longer for DRI/DRM memory +management. The SiS DRM driver has been updated and features a memory manager +of its own (which will be used if sisfb is not compiled). So unless you want +a graphical console, you don't need sisfb on kernels >=2.6.3. + +Sidenote: Since this seems to be a commonly made mistake: sisfb and vesafb +cannot be active at the same time! Do only select one of them in your kernel +configuration. + + +How are parameters passed to sisfb? +=================================== + +Well, it depends: If compiled statically into the kernel, use lilo's append +statement to add the parameters to the kernel command line. Please see lilo's +(or GRUB's) documentation for more information. If sisfb is a kernel module, +parameters are given with the modprobe (or insmod) command. + +Example for sisfb as part of the static kernel: Add the following line to your +lilo.conf: + + append="video=sisfb:mode:1024x768x16,mem:12288,rate:75" + +Example for sisfb as a module: Start sisfb by typing + + modprobe sisfb mode=1024x768x16 rate=75 mem=12288 + +A common mistake is that folks use a wrong parameter format when using the +driver compiled into the kernel. Please note: If compiled into the kernel, +the parameter format is video=sisfb:mode:none or video=sisfb:mode:1024x768x16 +(or whatever mode you want to use, alternatively using any other format +described above or the vesa keyword instead of mode). If compiled as a module, +the parameter format reads mode=none or mode=1024x768x16 (or whatever mode you +want to use). Using a "=" for a ":" (and vice versa) is a huge difference! +Additionally: If you give more than one argument to the in-kernel sisfb, the +arguments are separated with ",". For example: + + video=sisfb:mode:1024x768x16,rate:75,mem:12288 + + +How do I use it? +================ + +Preface statement: This file only covers very little of the driver's +capabilities and features. Please refer to the author's and maintainer's +website at http://www.winischhofer.net/linuxsisvga.shtml for more +information. Additionally, "modinfo sisfb" gives an overview over all +supported options including some explanation. + +The desired display mode can be specified using the keyword "mode" with +a parameter in one of the follwing formats: + - XxYxDepth or + - XxY-Depth or + - XxY-Depth@Rate or + - XxY + - or simply use the VESA mode number in hexadecimal or decimal. + +For example: 1024x768x16, 1024x768-16@75, 1280x1024-16. If no depth is +specified, it defaults to 8. If no rate is given, it defaults to 60Hz. Depth 32 +means 24bit color depth (but 32 bit framebuffer depth, which is not relevant +to the user). + +Additionally, sisfb understands the keyword "vesa" followed by a VESA mode +number in decimal or hexadecimal. For example: vesa=791 or vesa=0x117. Please +use either "mode" or "vesa" but not both. + +Linux 2.4 only: If no mode is given, sisfb defaults to "no mode" (mode=none) if +compiled as a module; if sisfb is statically compiled into the kernel, it +defaults to 800x600x8 unless CRT2 type is LCD, in which case the LCD's native +resolution is used. If you want to switch to a different mode, use the fbset +shell command. + +Linux 2.6 only: If no mode is given, sisfb defaults to 800x600x8 unless CRT2 +type is LCD, in which case it defaults to the LCD's native resolution. If +you want to switch to another mode, use the stty shell command. + +You should compile in both vgacon (to boot if you remove you SiS card from +your system) and sisfb (for graphics mode). Under Linux 2.6, also "Framebuffer +console support" (fbcon) is needed for a graphical console. + +You should *not* compile-in vesafb. And please do not use the "vga=" keyword +in lilo's or grub's configuration file; mode selection is done using the +"mode" or "vesa" keywords as a parameter. See above and below. + + +X11 +=== + +If using XFree86 or X.org, it is recommended that you don't use the "fbdev" +driver but the dedicated "sis" X driver. The "sis" X driver and sisfb are +developed by the same person (Thomas Winischhofer) and cooperate well with +each other. + + +SVGALib +======= + +SVGALib, if directly accessing the hardware, never restores the screen +correctly, especially on laptops or if the output devices are LCD or TV. +Therefore, use the chipset "FBDEV" in SVGALib configuration. This will make +SVGALib use the framebuffer device for mode switches and restoration. + + +Configuration +============= + +(Some) accepted options: + +off - Disable sisfb. This option is only understood if sisfb is + in-kernel, not a module. +mem:X - size of memory for the console, rest will be used for DRI/DRM. X + is in kilobytes. On 300 series, the default is 4096, 8192 or + 16384 (each in kilobyte) depending on how much video ram the card + has. On 315/330 series, the default is the maximum available ram + (since DRI/DRM is not supported for these chipsets). +noaccel - do not use 2D acceleration engine. (Default: use acceleration) +noypan - disable y-panning and scroll by redrawing the entire screen. + This is much slower than y-panning. (Default: use y-panning) +vesa:X - selects startup videomode. X is number from 0 to 0x1FF and + represents the VESA mode number (can be given in decimal or + hexadecimal form, the latter prefixed with "0x"). +mode:X - selects startup videomode. Please see above for the format of + "X". + +Boolean options such as "noaccel" or "noypan" are to be given without a +parameter if sisfb is in-kernel (for example "video=sisfb:noypan). If +sisfb is a module, these are to be set to 1 (for example "modprobe sisfb +noypan=1"). + +-- +Thomas Winischhofer <thomas@winischhofer.net> +May 27, 2004 + + diff --git a/Documentation/fb/sstfb.txt b/Documentation/fb/sstfb.txt new file mode 100644 index 00000000000..628d7ffa876 --- /dev/null +++ b/Documentation/fb/sstfb.txt @@ -0,0 +1,174 @@ + +Introduction + + This is a frame buffer device driver for 3dfx' Voodoo Graphics + (aka voodoo 1, aka sst1) and VoodooČ (aka Voodoo 2, aka CVG) based + video boards. It's highly experimental code, but is guaranteed to work + on my computer, with my "Maxi Gamer 3D" and "Maxi Gamer 3dČ" boards, + and with me "between chair and keyboard". Some people tested other + combinations and it seems that it works. + The main page is located at <http://sstfb.sourceforge.net>, and if + you want the latest version, check out the CVS, as the driver is a work + in progress, I feel uncomfortable with releasing tarballs of something + not completely working...Don't worry, it's still more than useable + (I eat my own dog food) + + Please read the Bug section, and report any success or failure to me + (Ghozlane Toumi <gtoumi@laposte.net>). + BTW, If you have only one monitor , and you don't feel like playing + with the vga passthrou cable, I can only suggest borrowing a screen + somewhere... + + +Installation + + This driver (should) work on ix86, with "late" 2.2.x kernel (tested + with x = 19) and "recent" 2.4.x kernel, as a module or compiled in. + It has been included in mainstream kernel since the infamous 2.4.10. + You can apply the patches found in sstfb/kernel/*-2.{2|4}.x.patch, + and copy sstfb.c to linux/drivers/video/, or apply a single patch, + sstfb/patch-2.{2|4}.x-sstfb-yymmdd to your linux source tree. + + Then configure your kernel as usual: choose "m" or "y" to 3Dfx Voodoo + Graphics in section "console". Compile, install, have fun... and please + drop me a report :) + + +Module Usage + + Warnings. + # You should read completely this section before issuing any command. + # If you have only one monitor to play with, once you insmod the + module, the 3dfx takes control of the output, so you'll have to + plug the monitor to the "normal" video board in order to issue + the commands, or you can blindly use sst_dbg_vgapass + in the tools directory (See Tools). The latest solution is pass the + parameter vgapass=1 when insmodding the driver. (See Kernel/Modules + Options) + + Module insertion: + # insmod sstfb.o + you should see some strange output frome the board: + a big blue square, a green and a red small squares and a vertical + white rectangle. why ? the function's name is self explanatory : + "sstfb_test()"... + (if you don't have a second monitor, you'll have to plug your monitor + directely to the 2D videocard to see what you're typing) + # con2fb /dev/fbx /dev/ttyx + bind a tty to the new frame buffer. if you already have a frame + buffer driver, the voodoo fb will likely be /dev/fb1. if not, + the device will be /dev/fb0. You can check this by doing a + cat /proc/fb. You can find a copy of con2fb in tools/ directory. + if you don't have another fb device, this step is superfluous, + as the console subsystem automagicaly binds ttys to the fb. + # switch to the virtual console you just mapped. "tadaaa" ... + + Module removal: + # con2fb /dev/fbx /dev/ttyx + bind the tty to the old frame buffer so the module can be removed. + (how does it work with vgacon ? short answer : it doesn't work) + # rmmod sstfb + + +Kernel/Modules Options + + You can pass some otions to sstfb module, and via the kernel command + line when the driver is compiled in : + for module : insmod sstfb.o option1=value1 option2=value2 ... + in kernel : video=sstfb:option1,option2:value2,option3 ... + + sstfb supports the folowing options : + +Module Kernel Description + +vgapass=0 vganopass Enable or disable VGA passthrou cable. +vgapass=1 vgapass When enabled, the monitor will get the signal + from the VGA board and not from the voodoo. + Default: nopass + +mem=x mem:x Force frame buffer memory in MiB + allowed values: 0, 1, 2, 4. + Default: 0 (= autodetect) + +inverse=1 inverse Supposed to enable inverse console. + doesn't work yet... + +clipping=1 clipping Enable or disable clipping. +clipping=0 noclipping With clipping enabled, all offscreen + reads and writes are disgarded. + Default: enable clipping. + +gfxclk=x gfxclk:x Force graphic clock frequency (in MHz). + Be carefull with this option, it may be + DANGEROUS. + Default: auto + 50Mhz for Voodoo 1, + 75MHz for Voodoo 2. + +slowpci=1 fastpci Enable or disable fast PCI read/writes. +slowpci=1 slowpci Default : fastpci + +dev=x dev:x Attach the driver to device number x. + 0 is the first compatible board (in + lspci order) + +Tools + + These tools are mostly for debugging purposes, but you can + find some of these interesting : + - con2fb , maps a tty to a fbramebuffer . + con2fb /dev/fb1 /dev/tty5 + - sst_dbg_vgapass , changes vga passthrou. You have to recompile the + driver with SST_DEBUG and SST_DEBUG_IOCTL set to 1 + sst_dbg_vgapass /dev/fb1 1 (enables vga cable) + sst_dbg_vgapass /dev/fb1 0 (disables vga cable) + - glide_reset , resets the voodoo using glide + use this after rmmoding sstfb, if the module refuses to + reinsert . + +Bugs + + - DO NOT use glide while the sstfb module is in, you'll most likely + hang your computer. + - If you see some artefacts (pixels not cleaning and stuff like that), + try turning off clipping (clipping=0), and/or using slowpci + - the driver don't detect the 4Mb frame buffer voodoos, it seems that + the 2 last Mbs wrap around. looking into that . + - The driver is 16 bpp only, 24/32 won't work. + - The driver is not your_favorite_toy-safe. this includes SMP... + [Actually from inspection it seems to be safe - Alan] + - when using XFree86 FBdev (X over fbdev) you may see strange color + patterns at the border of your windows (the pixels lose the lowest + byte -> basicaly the blue component nd some of the green) . I'm unable + to reproduce this with XFree86-3.3, but one of the testers has this + problem with XFree86-4. apparently recent Xfree86-4.x solve this + problem. + - I didn't really test changing the palette, so you may find some weird + things when playing with that. + - Sometimes the driver will not recognise the DAC , and the + initialisation will fail. this is specificaly true for + voodoo 2 boards , but it should be solved in recent versions. please + contact me . + - the 24/32 is not likely to work anytime soon , knowing that the + hardware does ... unusual thigs in 24/32 bpp + - When used with anther video board, current limitations of linux + console subsystem can cause some troubles, specificaly, you should + disable software scrollback , as it can oops badly ... + +Todo + + - Get rid of the previous paragraph. + - Buy more coffee. + - test/port to other arch. + - try to add panning using tweeks with front and back buffer . + - try to implement accel on voodoo2 , this board can actualy do a + lot in 2D even if it was sold as a 3D only board ... + +ghoz. + +-- +Ghozlane Toumi <gtoumi@laposte.net> + + +$Date: 2002/05/09 20:11:45 $ +http://sstfb.sourceforge.net/README diff --git a/Documentation/fb/tgafb.txt b/Documentation/fb/tgafb.txt new file mode 100644 index 00000000000..250083ada8f --- /dev/null +++ b/Documentation/fb/tgafb.txt @@ -0,0 +1,69 @@ +$Id: tgafb.txt,v 1.1.2.2 2000/04/04 06:50:18 mato Exp $ + +What is tgafb? +=============== + +This is a driver for DECChip 21030 based graphics framebuffers, a.k.a. TGA +cards, which are usually found in older Digital Alpha systems. The +following models are supported: + +ZLxP-E1 (8bpp, 2 MB VRAM) +ZLxP-E2 (32bpp, 8 MB VRAM) +ZLxP-E3 (32bpp, 16 MB VRAM, Zbuffer) + +This version is an almost complete rewrite of the code written by Geert +Uytterhoeven, which was based on the original TGA console code written by +Jay Estabrook. + +Major new features since Linux 2.0.x: + + * Support for multiple resolutions + * Support for fixed-frequency and other oddball monitors + (by allowing the video mode to be set at boot time) + +User-visible changes since Linux 2.2.x: + + * Sync-on-green is now handled properly + * More useful information is printed on bootup + (this helps if people run into problems) + +This driver does not (yet) support the TGA2 family of framebuffers, so the +PowerStorm 3D30/4D20 (also known as PBXGB) cards are not supported. These +can however be used with the standard VGA Text Console driver. + + +Configuration +============= + +You can pass kernel command line options to tgafb with +`video=tgafb:option1,option2:value2,option3' (multiple options should be +separated by comma, values are separated from options by `:'). +Accepted options: + +font:X - default font to use. All fonts are supported, including the + SUN12x22 font which is very nice at high resolutions. + +mode:X - default video mode. The following video modes are supported: + 640x480-60, 800x600-56, 640x480-72, 800x600-60, 800x600-72, + 1024x768-60, 1152x864-60, 1024x768-70, 1024x768-76, + 1152x864-70, 1280x1024-61, 1024x768-85, 1280x1024-70, + 1152x864-84, 1280x1024-76, 1280x1024-85 + + +Known Issues +============ + +The XFree86 FBDev server has been reported not to work, since tgafb doesn't do +mmap(). Running the standard XF86_TGA server from XFree86 3.3.x works fine for +me, however this server does not do acceleration, which make certain operations +quite slow. Support for acceleration is being progressively integrated in +XFree86 4.x. + +When running tgafb in resolutions higher than 640x480, on switching VCs from +tgafb to XF86_TGA 3.3.x, the entire screen is not re-drawn and must be manually +refreshed. This is an X server problem, not a tgafb problem, and is fixed in +XFree86 4.0. + +Enjoy! + +Martin Lucina <mato@kotelna.sk> diff --git a/Documentation/fb/tridentfb.txt b/Documentation/fb/tridentfb.txt new file mode 100644 index 00000000000..8a6c8a43e6a --- /dev/null +++ b/Documentation/fb/tridentfb.txt @@ -0,0 +1,54 @@ +Tridentfb is a framebuffer driver for some Trident chip based cards. + +The following list of chips is thought to be supported although not all are +tested: + +those from the Image series with Cyber in their names - accelerated +those with Blade in their names (Blade3D,CyberBlade...) - accelerated +the newer CyberBladeXP family - nonaccelerated + +Only PCI/AGP based cards are supported, none of the older Tridents. + +How to use it? +============== + +When booting you can pass the video parameter. +video=tridentfb + +The parameters for tridentfb are concatenated with a ':' as in this example. + +video=tridentfb:800x600,bpp=16,noaccel + +The second level parameters that tridentfb understands are: + +noaccel - turns off acceleration (when it doesn't work for your card) +accel - force text acceleration (for boards which by default are noacceled) + +fp - use flat panel related stuff +crt - assume monitor is present instead of fp + +center - for flat panels and resolutions smaller than native size center the + image, otherwise use +stretch + +memsize - integer value in Kb, use if your card's memory size is misdetected. + look at the driver output to see what it says when initializing. +memdiff - integer value in Kb,should be nonzero if your card reports + more memory than it actually has.For instance mine is 192K less than + detection says in all three BIOS selectable situations 2M, 4M, 8M. + Only use if your video memory is taken from main memory hence of + configurable size.Otherwise use memsize. + If in some modes which barely fit the memory you see garbage at the bottom + this might help by not letting change to that mode anymore. + +nativex - the width in pixels of the flat panel.If you know it (usually 1024 + 800 or 1280) and it is not what the driver seems to detect use it. + +bpp - bits per pixel (8,16 or 32) +mode - a mode name like 800x600 (as described in Documentation/fb/modedb.txt) + +Using insane values for the above parameters will probably result in driver +misbehaviour so take care(for instance memsize=12345678 or memdiff=23784 or +nativex=93) + +Contact: jani@astechnix.ro diff --git a/Documentation/fb/vesafb.txt b/Documentation/fb/vesafb.txt new file mode 100644 index 00000000000..814e2f56a6a --- /dev/null +++ b/Documentation/fb/vesafb.txt @@ -0,0 +1,167 @@ + +What is vesafb? +=============== + +This is a generic driver for a graphic framebuffer on intel boxes. + +The idea is simple: Turn on graphics mode at boot time with the help +of the BIOS, and use this as framebuffer device /dev/fb0, like the m68k +(and other) ports do. + +This means we decide at boot time whenever we want to run in text or +graphics mode. Switching mode later on (in protected mode) is +impossible; BIOS calls work in real mode only. VESA BIOS Extensions +Version 2.0 are required, because we need a linear frame buffer. + +Advantages: + + * It provides a nice large console (128 cols + 48 lines with 1024x768) + without using tiny, unreadable fonts. + * You can run XF68_FBDev on top of /dev/fb0 (=> non-accelerated X11 + support for every VBE 2.0 compliant graphics board). + * Most important: boot logo :-) + +Disadvantages: + + * graphic mode is slower than text mode... + + +How to use it? +============== + +Switching modes is done using the vga=... boot parameter. Read +Documentation/svga.txt for details. + +You should compile in both vgacon (for text mode) and vesafb (for +graphics mode). Which of them takes over the console depends on +whenever the specified mode is text or graphics. + +The graphic modes are NOT in the list which you get if you boot with +vga=ask and hit return. The mode you wish to use is derived from the +VESA mode number. Here are those VESA mode numbers: + + | 640x480 800x600 1024x768 1280x1024 +----+------------------------------------- +256 | 0x101 0x103 0x105 0x107 +32k | 0x110 0x113 0x116 0x119 +64k | 0x111 0x114 0x117 0x11A +16M | 0x112 0x115 0x118 0x11B + +The video mode number of the Linux kernel is the VESA mode number plus +0x200. + + Linux_kernel_mode_number = VESA_mode_number + 0x200 + +So the table for the Kernel mode numbers are: + + | 640x480 800x600 1024x768 1280x1024 +----+------------------------------------- +256 | 0x301 0x303 0x305 0x307 +32k | 0x310 0x313 0x316 0x319 +64k | 0x311 0x314 0x317 0x31A +16M | 0x312 0x315 0x318 0x31B + +To enable one of those modes you have to specify "vga=ask" in the +lilo.conf file and rerun LILO. Then you can type in the desired +mode at the "vga=ask" prompt. For example if you like to use +1024x768x256 colors you have to say "305" at this prompt. + +If this does not work, this might be because your BIOS does not support +linear framebuffers or because it does not support this mode at all. +Even if your board does, it might be the BIOS which does not. VESA BIOS +Extensions v2.0 are required, 1.2 is NOT sufficient. You will get a +"bad mode number" message if something goes wrong. + +1. Note: LILO cannot handle hex, for booting directly with + "vga=mode-number" you have to transform the numbers to decimal. +2. Note: Some newer versions of LILO appear to work with those hex values, + if you set the 0x in front of the numbers. + +X11 +=== + +XF68_FBDev should work just fine, but it is non-accelerated. Running +another (accelerated) X-Server like XF86_SVGA might or might not work. +It depends on X-Server and graphics board. + +The X-Server must restore the video mode correctly, else you end up +with a broken console (and vesafb cannot do anything about this). + + +Refresh rates +============= + +There is no way to change the vesafb video mode and/or timings after +booting linux. If you are not happy with the 60 Hz refresh rate, you +have these options: + + * configure and load the DOS-Tools for your the graphics board (if + available) and boot linux with loadlin. + * use a native driver (matroxfb/atyfb) instead if vesafb. If none + is available, write a new one! + * VBE 3.0 might work too. I have neither a gfx board with VBE 3.0 + support nor the specs, so I have not checked this yet. + + +Configuration +============= + +The VESA BIOS provides protected mode interface for changing +some parameters. vesafb can use it for palette changes and +to pan the display. It is turned off by default because it +seems not to work with some BIOS versions, but there are options +to turn it on. + +You can pass options to vesafb using "video=vesafb:option" on +the kernel command line. Multiple options should be separated +by comma, like this: "video=vesafb:ypan,invers" + +Accepted options: + +invers no comment... + +ypan enable display panning using the VESA protected mode + interface. The visible screen is just a window of the + video memory, console scrolling is done by changing the + start of the window. + pro: * scrolling (fullscreen) is fast, because there is + no need to copy around data. + * You'll get scrollback (the Shift-PgUp thing), + the video memory can be used as scrollback buffer + kontra: * scrolling only parts of the screen causes some + ugly flicker effects (boot logo flickers for + example). + +ywrap Same as ypan, but assumes your gfx board can wrap-around + the video memory (i.e. starts reading from top if it + reaches the end of video memory). Faster than ypan. + +redraw scroll by redrawing the affected part of the screen, this + is the safe (and slow) default. + + +vgapal Use the standard vga registers for palette changes. + This is the default. +pmipal Use the protected mode interface for palette changes. + +mtrr setup memory type range registers for the vesafb framebuffer. + +vremap:n + remap 'n' MiB of video RAM. If 0 or not specified, remap memory + according to video mode. (2.5.66 patch/idea by Antonino Daplas + reversed to give override possibility (allocate more fb memory + than the kernel would) to 2.4 by tmb@iki.fi) + +vtotal:n + if the video BIOS of your card incorrectly determines the total + amount of video RAM, use this option to override the BIOS (in MiB). + +Have fun! + + Gerd + +-- +Gerd Knorr <kraxel@goldbach.in-berlin.de> + +Minor (mostly typo) changes +by Nico Schmoigl <schmoigl@rumms.uni-mannheim.de> |