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authorAlbert ARIBAUD <albert.u.boot@aribaud.net>2013-04-12 22:07:57 +0200
committerAlbert ARIBAUD <albert.u.boot@aribaud.net>2013-04-12 22:07:57 +0200
commit18122019972ca639ee3b581257e3a63ff7c8efeb (patch)
tree52f7223e7c63f43322f3eee4722743e12190a19f /README
parent90639feaa0d66a204f9d03a325ab14e2f97f6cbb (diff)
parent785881f775252940185e10fbb2d5299c9ffa6bce (diff)
downloadu-boot-18122019972ca639ee3b581257e3a63ff7c8efeb.tar.gz
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Merge branch 'u-boot/master' into 'u-boot-arm/master'
Conflicts: drivers/video/exynos_fb.c
Diffstat (limited to 'README')
-rw-r--r--README95
1 files changed, 89 insertions, 6 deletions
diff --git a/README b/README
index 6272853993..14c83f4bb1 100644
--- a/README
+++ b/README
@@ -496,6 +496,13 @@ The following options need to be configured:
exists, unlike the similar options in the Linux kernel. Do not
set these options unless they apply!
+- CPU timer options:
+ CONFIG_SYS_HZ
+
+ The frequency of the timer returned by get_timer().
+ get_timer() must operate in milliseconds and this CONFIG
+ option must be set to 1000.
+
- Linux Kernel Interface:
CONFIG_CLOCKS_IN_MHZ
@@ -1329,6 +1336,29 @@ The following options need to be configured:
CONFIG_SH_MMCIF_CLK
Define the clock frequency for MMCIF
+- USB Device Firmware Update (DFU) class support:
+ CONFIG_DFU_FUNCTION
+ This enables the USB portion of the DFU USB class
+
+ CONFIG_CMD_DFU
+ This enables the command "dfu" which is used to have
+ U-Boot create a DFU class device via USB. This command
+ requires that the "dfu_alt_info" environment variable be
+ set and define the alt settings to expose to the host.
+
+ CONFIG_DFU_MMC
+ This enables support for exposing (e)MMC devices via DFU.
+
+ CONFIG_DFU_NAND
+ This enables support for exposing NAND devices via DFU.
+
+ CONFIG_SYS_DFU_MAX_FILE_SIZE
+ When updating files rather than the raw storage device,
+ we use a static buffer to copy the file into and then write
+ the buffer once we've been given the whole file. Define
+ this to the maximum filesize (in bytes) for the buffer.
+ Default is 4 MiB if undefined.
+
- Journaling Flash filesystem support:
CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE,
CONFIG_JFFS2_NAND_DEV
@@ -1930,15 +1960,15 @@ CBFS (Coreboot Filesystem) support
I2C_READ
- Code that returns TRUE if the I2C data line is high,
- FALSE if it is low.
+ Code that returns true if the I2C data line is high,
+ false if it is low.
eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0)
I2C_SDA(bit)
- If <bit> is TRUE, sets the I2C data line high. If it
- is FALSE, it clears it (low).
+ If <bit> is true, sets the I2C data line high. If it
+ is false, it clears it (low).
eg: #define I2C_SDA(bit) \
if(bit) immr->im_cpm.cp_pbdat |= PB_SDA; \
@@ -1946,8 +1976,8 @@ CBFS (Coreboot Filesystem) support
I2C_SCL(bit)
- If <bit> is TRUE, sets the I2C clock line high. If it
- is FALSE, it clears it (low).
+ If <bit> is true, sets the I2C clock line high. If it
+ is false, it clears it (low).
eg: #define I2C_SCL(bit) \
if(bit) immr->im_cpm.cp_pbdat |= PB_SCL; \
@@ -2768,6 +2798,32 @@ FIT uImage format:
Adds the MTD partitioning infrastructure from the Linux
kernel. Needed for UBI support.
+- UBI support
+ CONFIG_CMD_UBI
+
+ Adds commands for interacting with MTD partitions formatted
+ with the UBI flash translation layer
+
+ Requires also defining CONFIG_RBTREE
+
+ CONFIG_UBI_SILENCE_MSG
+
+ Make the verbose messages from UBI stop printing. This leaves
+ warnings and errors enabled.
+
+- UBIFS support
+ CONFIG_CMD_UBIFS
+
+ Adds commands for interacting with UBI volumes formatted as
+ UBIFS. UBIFS is read-only in u-boot.
+
+ Requires UBI support as well as CONFIG_LZO
+
+ CONFIG_UBIFS_SILENCE_MSG
+
+ Make the verbose messages from UBIFS stop printing. This leaves
+ warnings and errors enabled.
+
- SPL framework
CONFIG_SPL
Enable building of SPL globally.
@@ -3487,6 +3543,33 @@ but it can not erase, write this NOR flash by SRIO or PCIE interface.
environment. If redundant environment is used, it will be copied to
CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE.
+- CONFIG_ENV_IS_IN_UBI:
+
+ Define this if you have an UBI volume that you want to use for the
+ environment. This has the benefit of wear-leveling the environment
+ accesses, which is important on NAND.
+
+ - CONFIG_ENV_UBI_PART:
+
+ Define this to a string that is the mtd partition containing the UBI.
+
+ - CONFIG_ENV_UBI_VOLUME:
+
+ Define this to the name of the volume that you want to store the
+ environment in.
+
+ - CONFIG_ENV_UBI_VOLUME_REDUND:
+
+ Define this to the name of another volume to store a second copy of
+ the environment in. This will enable redundant environments in UBI.
+ It is assumed that both volumes are in the same MTD partition.
+
+ - CONFIG_UBI_SILENCE_MSG
+ - CONFIG_UBIFS_SILENCE_MSG
+
+ You will probably want to define these to avoid a really noisy system
+ when storing the env in UBI.
+
- CONFIG_SYS_SPI_INIT_OFFSET
Defines offset to the initial SPI buffer area in DPRAM. The