From a9f8ad8f2acdb2398da5d32a5efc19cb0196d79f Mon Sep 17 00:00:00 2001 From: David Gibson Date: Fri, 1 Apr 2011 15:15:34 +1100 Subject: Add SLOF-based partition firmware for pSeries machine, allowing more boot options Currently, the emulated pSeries machine requires the use of the -kernel parameter in order to explicitly load a guest kernel. This means booting from the virtual disk, cdrom or network is not possible. This patch addresses this limitation by inserting a within-partition firmware image (derived from the "SLOF" free Open Firmware project). If -kernel is not specified, qemu will now load the SLOF image, which has access to the qemu boot device list through the device tree, and can boot from any of the usual virtual devices. In order to support the new firmware, an extension to the emulated machine/hypervisor is necessary. Unlike Linux, which expects multi-CPU entry to be handled kexec() style, the SLOF firmware expects only one CPU to be active at entry, and to use a hypervisor RTAS method to enable the other CPUs one by one. This patch also implements this 'start-cpu' method, so that SLOF can start the secondary CPUs and marshal them into the kexec() holding pattern ready for entry into the guest OS. Linux should, and in the future might directly use the start-cpu method to enable initially disabled CPUs, but for now it does require kexec() entry. Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Paul Mackerras Signed-off-by: David Gibson Signed-off-by: Alexander Graf --- pc-bios/README | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'pc-bios/README') diff --git a/pc-bios/README b/pc-bios/README index 3fc09449fa..646a31a313 100644 --- a/pc-bios/README +++ b/pc-bios/README @@ -13,6 +13,11 @@ The included image for PowerPC (for 32 and 64 bit PPC CPUs), Sparc32 and Sparc64 are built from OpenBIOS SVN revision 1018. +- SLOF (Slimline Open Firmware) is a free IEEE 1275 Open Firmware + implementation for certain IBM POWER hardware. The sources are at + https://github.com/dgibson/SLOF, and the image currently in qemu is + built from git tag qemu-slof-20110323. + - The PXE roms come from Rom-o-Matic gPXE 0.9.9 with BANNER_TIMEOUT=0 e1000 8086:100E -- cgit v1.2.3