We are using grub2 payload.
When we configure coreboot with CONFIG_CBFS_SIZE and CONFIG_ROM_SIZE to be same, grub fails to mount cbfsdisk. We added prints and found that it fails at following check in grub-core/fs/cbfs.c
ptr = grub_cpu_to_le32 (ptr);
header_off = (grub_disk_get_size (disk) << GRUB_DISK_SECTOR_BITS)
+ (grub_int32_t) ptr;
if (grub_disk_read (disk, 0, header_off,
sizeof (head), &head))
goto fail;
However if we keep margin of min 64KB between CONFIG_ROM_SIZE and CONFIG_CBFS_SIZE it works perfectly.
Is there any possibility that coreboot mess up cbfs layout when both rom size and cbfs size are same
Thank you