Re: e100 PCI bridge problem

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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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