[coreboot] Burn 2MB coreboot.rom on 8MB flash chip

[Jose Trujillo]

Hello Zvika:

First get the correct original full 8MB FW from the manufacturer or dump it from the board with the command in EFI:
"ftp -d BYT_orig.bin" and double save it.

2.- in coreboot/util/ifdtool do make and sudo make install.
3.- in terminal go to the FW directory and do:    "ifdtool BYT_orig.bin -f fw_layout.txt"
      a).- in "fw_layout.txt" you will get the BIOS area size from the original FW (just substract).
      b).- if the size of the original BIOS is bigger or equal than coreboot build you are good to go ahead.
4.- copy/move "BYT_orig.bin" in the directory which resides the coreboot folder (not inside the coreboot folder) and do:
     ifdtool -i BIOS:./coreboot/build/coreboot.rom CB_baytrail.bin
5.- flash it:   "fpt -f CB_baytrail.bin" booting from UEFI.

If the build was correctly done and followed accurately those steps the system should boot.

Good luck,
Jose Trujillo.

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Monday, September 24, 2018 10:18 PM, Zvi Vered <veredz72 at gmail.com> wrote:

> Hello,
>
> I have an Intel's ATOM Bay Trail board. The output of "inteltool" is:
>
> CPU: ID 0x30679, Processor Type 0x0, Family 0x6, Model 0x37, Stepping 0x9
> Northbridge: 8086:0f00 (Bay Trail)
> Southbridge: 8086:0f1c (Bay Trail)
> IGD: 8086:0f31 (unknown)
>
> In coreboot configuration I selected:
> Mainboard -> Mainboard model -> Bayley Bay FSP-based CRB
> The default ROM chip size is 2MB.
> This is also the size of coreboot.rom created after "make"
>
> The board has 8MB BIOS flash.
> It's delivered with a BIOS programming utility that runs under EFI shell.
>
> The original BIOS has 2 versions: rom (5MB) and bin (8MB)
> I tried to burn the 2MB coreboot.rom with the vendor's BIOS utlity.
>
> I got:
> 3 - Error: ROM file size does not match existing BIOS size.
> Should I convert coreboot.rom to coreboot.bin ? How ?
> If not, how can I program coreboot.rom ?
>
> Thank you,
> Zvika
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