From mboxrd@z Thu Jan  1 00:00:00 1970
From: richardvoigt at gmail.com <richardvoigt@gmail.com>
Date: Sun, 4 Apr 2010 02:03:38 -0500
Subject: [14e4:4315] Fatal DMA errors on Dell Vostro 1310 (Celeron M540)
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> Again with the PCI-E core selected, if the PCI-E core revision is >= 6,
> set bit 0x8000 in MMIO register 0x280A.
>
> When running wl on my machine, these changes show up as the contents of
> 0x0800 going from 0x2801 to 0x3801 and 0x280A going from 0x6FDE to
> 0xEBDE. On John's Netbook, both values are already at the correct values.

In your example, bit 0x8000 at 0x280A is set, but bit 0x0400 is also
unset.  Don't know if that's important.