On 23.05.2017 18:49, Gailu Singh wrote:
Hi Experts,
If we use CBFS_SIZE to be same as ROM_SIZE on our apollolake board grub fails to load grub.cfg located in CBFS. Based on experiments we found that grub.cfg is loaded correctly if we keep minimum difference of 64KB between CBFS_SIZE and ROM_SIZE if we reduce it to less that 64KB problem happens.
Can someone please explain the behavior and if it is expected behavior or a bug?
Setting both the same seems very wrong to me for Apollo Lake. ROM_SIZE is supposed to be the full size of the flash chip. That chip is shared by SoC configuration, blobs and the BIOS/coreboot. coreboot will reside in the "BIOS" region of the chip, CBFS_SIZE should be at most the size of that region.
Hope that helps, Nico
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Nico Huber