[flashrom] multiple spi chips and controllers question

Andriy Gapon avg at icyb.net.ua
Sat Sep 12 22:28:00 CEST 2009

on 10/09/2009 21:36 Andriy Gapon said the following:
> The reason I am asking - this mainboard has Gigabyte DualBIOS feature
> ("non-virtual"), and there are two physical SPI flash chips on the board.
> I am curious as to how they are wired.
> Are they wired to different controllers? Or the same one - then which one?
> Can I access both of them?
> Does anybody know about that or has a reasonable guess?

Not sure if I am correct or if it matters to anybody besides me, but it seems
that in my case both SPI flash chips are connected to IT8718 SuperIO.
And I think that the chips are selected via bit 0 of register 0xEF of device
with LDN 7 (i.e. GPIO).
That register and bit do not appear to be documented in the publicly available
specifications that I could find via google.

Maybe somebody would find this information useful.

Andriy Gapon

More information about the flashrom mailing list