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SubjectRe: [PATCH] quiet MMCONFIG related printks
On Wed, 2007-01-03 at 08:49 -0800, Jesse Barnes wrote:
> On Wednesday, January 3, 2007 5:53 am, Arjan van de Ven wrote:
> > On Mon, 2007-01-01 at 21:01 -0800, Jesse Barnes wrote:
> > > Using MMCONFIG for PCI config space access is simply an
> > > optimization, not a requirement. Therefore, when it can't be used,
> > > there's no need for KERN_ERR level message. This patch makes the
> > > message a KERN_INFO instead to reduce some of the noise in a kernel
> > > boot with the 'quiet' option. (Note that this has no effect on a
> > > normal boot, which is ridiculously verbose these days.)
> >
> > this is wrong, please leave this loud complaint in...
> So the issues as I understand them:
> o some BIOSes are broken and don't properly map MCFG space (though
> according to Petr V. reserving MCFG space in e820 is optional, so
> the test may be slightly wrong as-is)

it's optional but it's the best test we have for "is the bios total
crap" ;(

> o MCFG space is required for (many) PCIe devices (any regular PCI
> devices?)

it's not required for *many* (it can't be, windows XP doesn't use MCFG),
but it's required for some of the advanced PCI-E features

> o often, there's nothing the user can do to address the points above

other than complain to the vendor.

> So where does that leave us? I've got what I consider to be a stupid
> error message in my log.

contact your bios vendor.

> My system behavior isn't affected in any way
> (at least that I can tell), yet I get a loud complaint at boot time.
> I guess I just have to live with it?

We really really should complain about bios issues. If only to make sure
vendors who do pay attention to linux have a chance of finding and
fixing them (and via the firmware kit, several big vendors pay attention
early on nowadays)

if you want to mail me at work (you don't), use arjan (at)
Test the interaction between Linux and your BIOS via

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