linux-kernel - Re: e100 PCI bridge problem

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Date:	Fri, 13 Jul 2007 13:36:26 -0700
From:	"Kok, Auke" <auke-jan.h.kok@...el.com>
To:	William Montgomery <william@...nicus.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: e100 PCI bridge problem

William Montgomery wrote:
> In an earlier post to the list I described a hard lockup condition
> that occurs on linux kernels 2.4.22, 2.6.13, and 2.6.17 when using
> a 4 port 10/100 fast ethernet card.  The lockup is easily repeatable
> and occurs on 2 out of 3 computers.
> 
> Further testing has revealed that the lockup can be prevented on all
> computers by making sure the card is installed on the primary PCI bus.
> If the card is installed in a slot on the secondary PCI bus (behind a
> PCI to PCI bridge) the lockup occurs.

sounds like int-A/B/C/D routing issues

> Are there any PCI tuning registers that I can tweak to get around
> this problem?  Any changes I could make to the e100 driver to fix this?

this issue might be resolvable by quirking the bridgee chips and adjusting any 
APIC where needed. Unfortunately I don't know much about this but it's 
physically not possible from the e100 driver. The special (non-intel) card that 
has these 4 ports onboard contains a bridge chip itself which explains the 
issues. Even a BIOS issue could be the cause here.

Perhaps the linuxfirmwarekit will reveal more information. In any case, fixing 
this in software would be a gigantic effort.

Auke
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