From: Jon Smirl <jonsmirl@gmail.com>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Linux Kernel list <linux-kernel@vger.kernel.org>,
Jon Smirl <jonsmirl@yahoo.com>
Subject: Re: pci_fixup_video() bogosity
Date: Tue, 8 Mar 2005 00:57:33 -0500 [thread overview]
Message-ID: <9e473391050307215776f5c06@mail.gmail.com> (raw)
In-Reply-To: <1110256709.13607.248.camel@gaston>
On Tue, 08 Mar 2005 15:38:29 +1100, Benjamin Herrenschmidt
<benh@kernel.crashing.org> wrote:
> Hi !
>
> While working on writing a VGA access arbiter for kernel & userland,
> I wondered how to properly get my "initial" state at boot. For that,
> I looked at how the new PCI ROM stuff does to find out who owns the
> memory shadow at c0000, and found it quite bogus.
>
> >From what I see, the code is only based on looking at what bridges
> have VGA forwarding enabled. It doesn't test the actual IO and Memory
> enable bits of the VGA cards themselves.
Let's fix it up and make it more robust. I was playing with checking
IO/mem enable and forgot to finish it.
> What if you have 2 cards under the same bridge ?
I believe the default on x86 is to pick the one in the lowest slot
number. What happens on PPC?
--
Jon Smirl
jonsmirl@gmail.com
next prev parent reply other threads:[~2005-03-08 5:58 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-08 4:38 pci_fixup_video() bogosity Benjamin Herrenschmidt
2005-03-08 5:57 ` Jon Smirl [this message]
2005-03-08 7:17 ` Benjamin Herrenschmidt
2005-03-11 3:39 ` Jon Smirl
2005-03-11 3:42 ` Benjamin Herrenschmidt
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