[coreboot] CBFS mounting failure

Nico Huber nico.h at gmx.de
Thu Jun 15 00:15:40 CEST 2017


On 14.06.2017 23:23, Gailu Singh wrote:
> Hi Experts,
> 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.

if you work with a modern x86 system that is expected. The flash chip
isn't dedicated to the "BIOS" anymore. In case of an Intel system the
CBFS must not be bigger than the BIOS region of the flash chip, or it
will be overwritten by other firmware parts. Again in case of Intel,
you can use `ifdtool` [1] to decode the flash regions.


[1] in `util/ifdtool` of the coreboot source tree

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