[coreboot] C720 swapparoo

[John Lewis]

On 29/01/14 22:49, Aaron Durbin wrote:

>>
>> Okay. I ran:
>>
>> git fetch http://review.coreboot.org/coreboot refs/changes/71/4771/1 && git
>> checkout FETCH_HEAD
>>
>> then ran make, which updated the binary, but still no change in reading the
>> file.
>>
>> I also compiled and ran the cbfstool in ./util in case that was somehow
>> different, but same result.
>
> I did this w/ the ChromeOS coreboot:
>
> $ dd if=/dev/zero of=spi.bin bs=1M count=7
> $ cat spi.bin c720-coreboot.bin > c720-coreboot-8MiB.bin
> $ cbfstool c720-coreboot-8MiB.bin  print
> c720-coreboot-8MiB.bin: 8192 kB, bootblocksize 3144, romsize 8388608,
> offset 0x700000
> alignment: 64 bytes, architecture: x86
>
> Name                           Offset     Type         Size
> cmos_layout.bin                0x700000   cmos_layout  1164
> pci8086,0406.rom               0x7004c0   optionrom    65536
> cpu_microcode_blob.bin         0x710500   microcode    41024
> config                         0x71a5c0   raw          5541
> fallback/vboot                 0x71bbc0   stage        15081
> (empty)                        0x71f700   null         2136
> fallback/romstage              0x71ff80   stage        42497
> fallback/coreboot_ram          0x72a600   stage        91421
> fallback/payload               0x740b80   payload      54921
> u-boot.dtb                     0x74e280   (unknown)    7923
> (empty)                        0x7501c0   null         327128
> mrc.bin                        0x79ffc0   (unknown)    190180
> (empty)                        0x7ce700   null         120984
> spd.bin                        0x7ebfc0   (unknown)    1792
> (empty)                        0x7ec700   null         76888
>
> The file you use with cbfstool needs to match the header rom size. In
> this case it is 8MiB.
>
> Hope that helps.
>
> -Aaron
>

Yep, that's it. Thanks very much. I don't pretend to understand how the 
CBFS portion relates to the rest of the ROM, I just know the ROM format 
here is a little different to the older generation Chromebooks.

FTR, the mrc.bin I extracted manually was the right size! ;)

-John