On Sun, 07 Jan 2001, Linus Torvalds wrote:
[snip]
> If the VIA logic for getting/setting the irq is wrong, it should only be
> a problem if there are devices that _haven't_ been routed by the BIOS.
> Usually these devices are limited to things like USB, ACPI and CardBus
> controllers, and getting the irq routing wrong in that case can be
> deadly (infinite irq streams on the wrong irq line).
hmmmm, interesting that you should mention usb in this conversation.
there's a problem with usb in smp-enabled kernels running on the via
apollo pro 133a chipset. basically, unless apic is disabled, the usb
controller (usb-uhci) doesn't get any interrupts and no usb device will
be recognized. this has existed since the early 2.4.0-test days, if not
earlier.
i was talking with johannes erdfelt about this and he feels that it's a
pci irq routing problem. as of yet, we haven't been able to find anyone
who can help. we do see an occasional message on linux-usb about this
problem though.
> Could anybody with a VIA chip who has the energy please do something for
> me:
> - enable DEBUG in arch/i386/kernel/pci-i386.h
> - do a "/sbin/lspci -xxvvv" on the interrupt routing chip (it's the
> "ISA bridge" chip - the VIA numbers are 82c586, 82c596, the PCI
> numbers for them are 1106:0586 and 1106:0596, I think)
> - do a cat /proc/pci
from a follow-up post, i get the impression that this won't help with
smp-enabled systems, but if there's something similar that you think
might help solve this one, please let me know and i'll be more than
happy to oblige.
thanks,
pete
-- Pete Toscano p:sigsegv@psinet.com w:pete@research.netsol.com GPG fingerprint: D8F5 A087 9A4C 56BB 8F78 B29C 1FF0 1BA7 9008 2736
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