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

Jose Trujillo ce.autom at protonmail.com
Tue Sep 25 11:15:50 CEST 2018

Sorry I Forgot:
"CB_baytrail.bin" is just a renamed copy of "BYT_orig.bin".
After that command a new file will be named: "BYT_orig.bin.new"

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Tuesday, September 25, 2018 10:16 AM, Jose Trujillo <ce.autom at protonmail.com> wrote:

> 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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