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.bin5.- 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@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 0x9Northbridge: 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 CRBThe 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