[PATCH] move coreboot_ram to CBFS - coreboot

27 May 2009


      Hi,
attached patch moves coreboot_ram and coreboot_apc to CBFS. That allows to 
reduce the size of the bootblock (the patch does this for kontron/986lcd-m), 
though I'll work on a more generic solution next (that will fix normal images 
with CBFS, too)
coreboot_ram and coreboot_apc are lzma compressed, which gives ~12kb versus 
nrv2b on the kontron, some of which will be used for the additional cbfs+lzma 
code in the ROM stage.
I tested it with qemu, kontron and amd/serengenti_cheetah (both with and 
without CBFS)
The patch for src/lib/cbfs.c isn't very clean right now, I'll fix it up later 
by adding ntohll there and fixing up cbfstool to create those fields in 
network order, too.
The patch creates three new files by copying:
A  +   src/arch/i386/init/ldscript_fallback_cbfs.lb
A  +   src/arch/i386/init/ldscript_cbfs.lb
A  +   src/arch/i386/lib/cbfs_and_run.c
They are created from ldscript_fallback.lb, ldscript.lb and copy_and_run.c in 
the respective directories, then modified.
An example on how the CBFS is used now (as said, the bootblocks can be reduced 
in size)
cbfstool coreboot-builds/kontron_986lcd-m/coreboot.rom print
coreboot-builds/kontron_986lcd-m/coreboot.rom: 1024 kB, bootblocksize 131072, 
romsize 1048576, offset 0x0
Alignment: 16 bytes
Name                           Offset     Type         Size
normal/payload                 0x0        payload      23229
normal/coreboot_ram            0x5af0     stage        107448
fallback/payload               0x1fee0    payload      23229
fallback/coreboot_ram          0x259e0    stage        107053
                               0x3fc50    free         656280
cbfstool coreboot-builds/amd_serengeti_cheetah/coreboot.rom print
coreboot-builds/amd_serengeti_cheetah/coreboot.rom: 512 kB, bootblocksize 
266240, romsize 524288, offset 0x0
Alignment: 16 bytes
Name                           Offset     Type         Size
normal/payload                 0x0        payload      23229
normal/coreboot_ram            0x5af0     stage        61307
normal/coreboot_apc            0x14ab0    stage        5687
fallback/payload               0x16120    payload      23229
fallback/coreboot_ram          0x1bc20    stage        60849
fallback/coreboot_apc          0x2aa10    stage        5687
                               0x2c080    free         77704
Signed-off-by: Patrick Georgi patrick.georgi@coresystems.de