[flashrom] Fwd: BIOS Write Enable bit problem.

Rich Futyma rich.futyma at sanmina.com
Sun Feb 10 01:45:05 CET 2013


Would happen to know which linux driver handles this interrupt?

Also, do you know where is this "correct handshake" described? It seems
that once bit 1 is set it can only be cleared by the reset.

On Sat, Feb 9, 2013 at 5:34 PM, Andrew Goodbody <ajg4tadpole at gmail.com>wrote:

> On 08/02/13 23:47, Rich Futyma wrote:
>> Does anyone know why bit 0 in the BIOS Control register cannot be set
>> using
>> Intel® X79 Express Chipset. This is what I get when running:
>> flashrom -r /tmp/bios.rom -p internal or  flashrom -w xx.rom -p internal
>> *Warning: Setting Bios Control at 0xdc from 0x2a to 0x0b on X79 failed.*
>> *New value is 0x2a.*
> You can see that bit 1 is already set. This will generate an SMI when you
> attempt to set bit 0. There will be SMM code that will reset bit 0 if you
> have not performed the correct handshake beforehand. This is a protection
> mechanism to prevent unauthorised modification of the BIOS.
> Andrew

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