Re: PCI cache line messages 2.4/2.5

From: David S. Miller (
Date: Thu Jun 05 2003 - 06:05:58 EST

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 <>
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