Date: Sun, 30 Jan 2005 18:45:47 +0100
From: David =?iso-8859-1?Q?H=E4rdeman?= <david@2gen.com>
To: linux-kernel@vger.kernel.org
Subject: Non transparent Intel 82801 PCI Bridge fix in mainline kernel?
Message-ID: <20050130174547.GB3373@hardeman.nu>
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Hi,

after installing more RAM in my IBM Thinkpad G40 laptop, I ran into the 
problem that PCMCIA ceased to work.

The problem turned out to have been reported to this list in 2003:
http://www.ussg.iu.edu/hypermail/linux/kernel/0306.3/0956.html

For a 2.6 kernel the fix seems to be to either comment out 
pci_fixup_transparent_bridge in arch/i386/pci/fixup.c or to raise the 
value of pci_mem_start in arch/i386/kernel/setup.c.

However, none of these fixes have made it into mainline kernel (and I 
guess that is because they would break other platforms where the 
pci_fixup_transparent_bridge *is* needed). So lots of newer IBM 
Thinkpads with 1Gb RAM or more are unsupported with a vanilla kernel.

Now, the question is, is there any probability of a more specific 
fix being merged into the kernel and is there anyone with the code-fu to 
create such a patch?

Kind regards,
David H?rdeman

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