RE: Subsystem IDs, again

["Kevin D. Davis" <kevind@ti.com>]

Please don't count on the BIOS to load up cards.

Once ACPI comes along, there is a good chance that your boot time BIOS 
won't get control after a power transistion.  There MIGHT be a chance for 
your driver to remember the ids, but that's not entirely clear to me.

As for your chip reading directly from the BIOS, for chips I put in the 
notebook, I merge the BIOS into the system BIOS.  Thus, MY core logic chip 
controls access to the BIOS, not your chip.  So, if you use this approach, 
make sure there is a cheap solution for notebooks.

Kevin

----------
From:  John R Pierce[SMTP:pierce@scruznet.com]
Sent:  Friday, August 02, 1996 1:20 AM
To:  Mailing List Recipients
Subject:  RE: Subsystem IDs, again

Peter wrote...
>A serial ROM is the only solution for expansion cards, but I don't think 
it
>violates the spirit or the letter of this requirement to use a write to 
the
>user config space to set up the subsystem ID on motherboard devices, and
>this would save motherboard designers the need to have one SROM per PCI
>device.

Actually, there is an alternative for devices with bios roms (mainly 
graphics
and scsi adapters)...  The subsystem ID registers can be mapped to fetch
from the bios rom in parallel...

-jrp

ꏯ