"flashrom" command succeeded on reading chip containing one-time programmable memory on 3 trials, but "cmp" command says there are different bytes among the 3 output files. - flashrom

14 Nov 2021


      Hello Flashrom team,
As captioned. I read the flashrom man page and understand that one-time
programmable memory may be out of scope of flashrom and hence the failure
on my chip readings.
My goal is to make a backup of the chip before I put my motherboard into
production and connect it to the internet. If my motherboard is hacked and
content within the chip changed, I can easily roll back the chip to a known
trustable state by flashing the backed up image back into the chip.
Can you please advise how I can achieve my goal? Should I go purchase a
hardware flash programmer and mess with it (I don't have any electronic
knowledge)? I searched the net and found "Bus Pirate", am I correct to say
that it is a programmer/debugger that can talk "directly" to the chip?
Would this possibly help in my case?
Motherboard                  : ASRock X300M-STX
CPU                          : AMD Ryzen 5600G
BIOS chip                    : Winbond W25Q128.w
"AMD fTPM switch" within BIOS: Disabled
Programmer used              : CH341a /w USB interface
Thank you for your time considering my questions. I hope you will have a
good day.
Alan