[flashrom] Why does the flash content differ

[microsoft gaofei]

The commands are just the following:
sudo flashrom -w newbios --programmer internal
The operation is successful, BIOS content is replaced and the computer can reboot successfully.
sudo flashrom -r compare --programmer internal
I later checked their SHA256 and found they¡¯re different. So what happened? Did the internal programmer modify the content?

[David Hendricks]

Post by microsoft gaofei
sudo flashrom -w newbios --programmer internal
The operation is successful, BIOS content is replaced and the computer can
reboot successfully.
sudo flashrom -r compare --programmer internal
I later checked their SHA256 and found they’re different. So what happened?
Did the internal programmer modify the content?

It's likely that something else wrote to the ROM (management engine,
embedded controller, BIOS, etc), especially during after doing a
reboot cycle.

[microsoft gaofei]

Sorry, it probably isn¡¯t flashrom problem. Some mainboards like ASUS put the debug information into the chip. To ensure that nothing is wrong, using an external programmer may be better.

[microsoft gaofei]

Is that possible to put a virus into another hardware rather than BIOS?

[microsoft gaofei]

Is that possible to put a virus into another hardware rather than BIOS? Why do the controller and engine write to BIOS?
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