[flashrom] Erasing on Asus M2N68-VM

Michael Karcher Michael.Karcher at fu-berlin.de
Fri Dec 4 01:42:00 CET 2009

Am Freitag, den 04.12.2009, 01:00 +0100 schrieb Michael Karcher:

some speculations, as guessing is cool:
> To select the BIOS ROM:
>   - Set bit 0 in the bitbang register
wild guess: This disables an chipset-internal SPI interface used for a
read-only mapping of the flash rom to the processor address space. But
it does not abort a transaction if it is running.
>   - Wait for bit 8 to be set (this is the *only* word access to the
> bitbang register, everything els is bytewise)
wild guess: This bit indicates that the chipset-internal SPI is idle.
>   - Clear bit 1 in the bitbang register
wild guess: This bit enables bit-bang access to the SPI interface.

  Michael Karcher
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