Thanks Micha,
The exemplar fmd you linked is very close to the simplest scheme I imagine.
I may be going to work on the build system, in order to generate such fmd automatically in the future, since there is a Kconfig variable CBFS_SIZE which actually stands for the size of SI_BIOS section, and sizes of SI_DESC, SI_GBE and SI_ME section can be inspected from the IFD file via ifdtool.
On Thursday, August 8, 2019 8:12 AM, Michal Zygowski michal.zygowski@3mdeb.com wrote:
Yes, if you are interested entirely in measured boot mode only, the RO section is sufficient.
The GBB is much greater since ChromeOS recovery bitmaps resides there. For non-ChromeOS devices (like many Lenovo laptops implement in coreboot) I saw min 120KiB (0x1e000). Should be sufficient. Example fmap description of flash with RO section: https://github.com/coreboot/coreboot/blob/master/src/mainboard/ocp/wedge100s... (probably you would like to adjust some offsets and sizes)
Best regards,