linux-kernel - Re: [PATCH] Re-add quirk for ServerWorks bridge secondary buses

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Date:	Mon, 28 Mar 2011 13:36:53 -0700
From:	Jonathan McDowell <noodles@...th.li>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Re-add quirk for ServerWorks bridge secondary buses

On Thu, Mar 24, 2011 at 05:58:30PM -0700, Bjorn Helgaas wrote:
> On Thu, Mar 24, 2011 at 11:27 AM, Jonathan McDowell
> <noodles@...th.li>wrote:
> 
> > On Wed, Mar 23, 2011 at 10:50:20PM -0700, Bjorn Helgaas wrote:
>
> > > I assume that since you don't have a standard BIOS, you don't have
> > > ACPI?
> >
> > Nope. Nor DMI. As previously mentioned there is a custom ASIC, but
> > it's hidden behind these bridges.
> >
> 
> Thanks.   Looks like your box doesn't even have PCI BIOS, so
> pcibios_last_bus == -1 until pci_fixup_serverworks() updates it, so we
> only scan bus 00.
> 
> Another option would be to boot with "pci=lastbus=0xff".  If you just
> have a box or two, that might be the easiest solution, but I guess I'm
> not opposed to a quirk like this.  It's a firmware workaround, not a
> hardware bug, and the message is irrelevant and possibly distracting
> on machines with decent firmware, but it's not terrible.

I've managed to get detection of the non-standard BIOS working, so I can
actually quirk much more specifically now for my purposes. I don't
believe there's any need to take this upstream if no one else is
reporting problems.

J.

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