Re: PCI IRQ problems -- update

Jim Paris
2004-12-11T20:23:19Z

> The PIIX should be in legacy mode by default in which case it would be
> on IRQ 14/15 only. Can you post boot messages ?

This is interesting:

$ lspci -x -s 1f.1
0000:00:1f.1 IDE interface: Intel Corp. 82801CAM IDE U100 (rev 02)
00: 86 80 8a 24 07 00 80 02 02 8e 01 01 00 00 00 00
10: f1 01 00 00 f5 03 00 00 01 00 00 00 01 00 00 00
20: 41 18 00 00 00 00 10 e0 00 00 00 00 f7 10 38 83
30: 00 00 00 00 00 00 00 00 00 00 00 00 ff 01 00 00

The ICH3-M datasheet says offset 0x09 is the Programming Interface
register. Default value is 0x8A (legacy on both), value here is 0x8E
(legacy on primary, native on secondary). This mixed-mode setting
is noted as a disallowed combination in the datasheet.

So it looks like my BIOS is screwing me. Where could/should I fix
this up?

-jim