Subject: Re: Intel D945GNT crashes with AGP enabled
From: Marcel Holtmann <marcel@holtmann.org>
To: Alan Hourihane <alanh@fairlite.demon.co.uk>
Cc: Dave Jones <davej@redhat.com>, linux-kernel@vger.kernel.org
In-Reply-To: <1130593470.6786.4.camel@jetpack.demon.co.uk>
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	 <1130593470.6786.4.camel@jetpack.demon.co.uk>
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Date: Sat, 29 Oct 2005 15:55:10 +0200
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Hi Alan,

> > > And btw why can't I compile the intelfb on x86_64? I use the internal
> > > graphics card (8086:2772) of the D945GNT motherboard.
> > > 
> > > 0000:00:02.0 VGA compatible controller: Intel Corporation 945G Integrated Graphics Controller (rev 02)
> > > 
> > > The Kconfig file makes it unselectable on x86_64 system.
> > > 
> > > config FB_INTEL
> > >         tristate "Intel 830M/845G/852GM/855GM/865G support (EXPERIMENTAL)"
> > >         depends on FB && EXPERIMENTAL && PCI && X86 && !X86_64
> > > 
> > > It seems that the most recent support in this driver is for the 915G and
> > > not for the 945G. Are they so different that we need a complete new
> > > driver or is the !X86_64 a relict from old times?
> > 
> > it seems that the first problem is:
> > 
> > arch/x86_64/kernel/built-in.o: In function `pci_iommu_init':
> > pci-gart.c:(.init.text+0x8f0c): undefined reference to `agp_amd64_init'
> > pci-gart.c:(.init.text+0x8f1a): undefined reference to `agp_bridge'
> > pci-gart.c:(.init.text+0x8f1f): undefined reference to `agp_copy_info'
> > make: *** [.tmp_vmlinux1] Error 1
> > 
> > Is this fixable or will the intelfb never work on x86_64 system?
> 
> You are barking up the wrong tree with this. Read the tristate line.
> 
> It doesn't mention 915 or 945 support. Intelfb only supports upto the
> 865G anyway.

I read that line and enabling the compilation of the intelfb on x86_64
was only a simple try to see if it compiles. It doesn't and basically I
have no idea how to fix it.

The 915G (8086:2582) is supported by the driver in the latest vanilla
kernel. Look at intelfb.h file and then you will see that the comment
line in Kconfig is outdated. I also found a patch to support the 915GM
(8086:2592) and maybe a similar patch will make the 945 work with the
intelfb driver.

Regards

Marcel


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