[coreboot] Hello and a question.

Peter Stuge peter at stuge.se
Wed Aug 11 21:01:34 CEST 2010

Votier, Sean (DS-1) wrote:
> these chipsets is there some basic legacy I/O mapping for parallel,
> serial and other real mode devices by default on power up?

Not sure, but I believe not - you usually need to configure that
legacy hardware stuff.

Maybe some GPIO on the FWH is reachable already very early; assuming
that the addresses needed to read it are decoded to the FWH..

> I'm hoping that something similar happens to the way that the
> Firmware Hub is made to look like a BIOS rom on power up.

The FWH is a flash chip on a LPC bus. The chipset needs to come up in
a way that CPU fetch from the reset vector is decoded to the flash.

> I need to read one GPIO pin very early in the bios initialisation
> and hope I can just look at a bit at I/O address 378.

My guess is that another solution would be better.


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