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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