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    SubjectRe: [PATCH] quiet MMCONFIG related printks
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    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) linux.intel.com
    Test the interaction between Linux and your BIOS via http://www.linuxfirmwarekit.org

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