[coreboot] CONFIG_CBFS_SIZE vs CONFIG_ROM_SIZE

[Gailu Singh]

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?
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