Re: PCI cache line messages 2.4/2.5

David S. Miller (davem@redhat.com)
05 Jun 2003 04:05:58 -0700

On Thu, 2003-06-05 at 03:39, Alan Cox wrote:
> > Your BIOS did not set the PCI cache line size correctly. The kernel
> > caught that mistake, and fixed it.
>
> I can't find anywhere the BIOS is obliged to set it for you if a PnP OS
> is installed, ditto in the presence of any form of hotplug the test is
> wrong.
>
> As far as I can see you can only warn if MWI is already set in the
> control word, and (I'd have to check the spec) possibly if the
> cache line size is non zero.

I don't know how PnP OS plays into it, but the last time I dug into this
deep dark area, the BIOS was expected to setup the cache line size for
all PCI devices in the system.

I do specifically remember situations, involving Acenic cards, where
one Acenic card would have things setup correctly but for whatever
reason the BIOS decided not to init the other Acenic cards.

-- 
David S. Miller <davem@redhat.com>
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