Hi,

Do you already have a 64MB BIOS chip? If not, you first need to check if your CPU supports that size (that's pretty big, I'd be surprised). If it does, are you planning to swap the chip?

Assuming the answer to the above is "yes", you'll also need to change the Intel Firmware Descriptor to recognize a 64MB chip so you can flash it.

I did this to upgrade my 8MB chip to a 16MB chip and wrote up a guide / experience report here: https://rsend.wordpress.com/x210-coreboot/increasing-rom-chip-size-on-an-x210/

Good luck,

Rafael

On Thu, Jun 11, 2020 at 9:44 AM <nitin.ramesh.singh@gmail.com> wrote:

Hi,

I am trying to build a Coreboot for a Flash Size as 64 MB, with 32MB reserved for a BIOS region.

I have modified the descriptor for a bios region:
02000000:03ffffff bios

The fmap used for the given setting is as follows:

FLASH@4227858432 0x4000000 {
BIOS@33554432 0x2000000 {
FMAP@0 0x200

RW_MRC_CACHE@65536 0x10000
COREBOOT(CBFS)@131072 33423360
}
}

Flash start -> 0xFC000000 (with-in 4GB space @4227858432)
Flash Size -> 0x4000000
BIOS Start offset w.r.t Flash start -> 0x2000000 (@33554432)
Bios region size -> 0x2000000
CBFS Size -> ‭0x1FE0000‬

Can any one please let me know what are the other changes required to incorporate the Coreboot image as per the given layout?

Thanks,
Nitin.
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