[mpeg2] Re: got kfir going!

[Dan Hollis <goemon@anime.net>]

On Fri, 2 Feb 2001, Ralph Metzler wrote:
> Dan Hollis writes:
>  > On Fri, 2 Feb 2001, Kees Cook wrote:
>  > > Makes me wonder how the kfir cards were built.  Perhaps their PCI hardware
>  > > isn't so great...  I tried *two* kfir card, and both acted the same way.
> The critical accesses usually are when the driver reads and writes
> from/to the Altera registers through the PLX PCI bridge.
> I don't know how the PCI config also influences this.

It is also possible the plx pci bridge requires some feature of the
motherboard bridge that some motherboards don't have.

Ralph if you could share some datasheets I could try investigating this
also.

> I developed the driver on an ASUS P2B-LS with Celeron 150@450 and an ABIT
> KT7-100 with Duron 600. It works with both of them now without
> crashing either at first insmod or after reloading with loaded=1.
> But as was reported by Kees it seems to depend on what other drivers
> might already be loaded and I will test if the same happens on my boards.
> I don't understand how this happens. Maybe the other drivers change
> something in the PCI config.

Remember that most motherboards have USB controller integrated into the
southbridge! This could definitely change the behaviour of the PCI bus.
Who knows what evil things the linux usb driver might be doing also... ;)

Maybe it's worth checking lspci output before and after loading USB module
to see if any pci config was changed?

-Dan