linux-kernel - re: skge error; hangs w/ hardware memory hole (was re: X86

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Message-ID: <456983E2.2060007@highlandsun.com>
Date:	Sun, 26 Nov 2006 04:09:06 -0800
From:	Howard Chu <hyc@...hlandsun.com>
To:	linux-kernel@...r.kernel.org
Subject: re: skge error; hangs w/ hardware memory hole (was re: X86_64 + VIA
 + 4g problems)

References: <20060703205238.GA10851@...recation.cyrius.com> 
<p73bqyufo97.fsf@...di.suse.de>

Just to tie up a loose end... I tested Andi Kleen's new patch for this 
issue on 2.6.18.3. While the patch didn't automatically detect the VIA 
chipset in my Asus A8V Deluxe, it allowed me to manually set a boot 
option that fixes the problem (by disabling DMA to addresses over 4GB). 
The fix is essentially the same as Andi posted here

http://groups.google.com/group/linux.kernel/msg/b1e820ef0212ee5e

although you have to patch pci-dma.c now, not pci-gart.c.

As another note - with my AGP aperture set to only 64MB, 3904MB are 
visible. With the aperture set to 256MB, the full 4096MB are visible.

-- 
  -- Howard Chu
  Chief Architect, Symas Corp.  http://www.symas.com
  Director, Highland Sun        http://highlandsun.com/hyc
  OpenLDAP Core Team            http://www.openldap.org/project/

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