ASUS A7V-E SE + Linux Kernel 2.6.15.1 = SATA Issues

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I have a system which was working perfectly with A7V motherboard and
kernel 2.6.13.2.  After a motherboard upgrade to A7V-E SE (only other
changes being graphics card and power supply), kernel 2.6.13.2 hung
during initial ATA detection, so I am now attempting to get 2.6.15.1
working (as the latest stable kernel).

2.6.15.1 can read the hard disks, just very slowly (with many timeouts,
I am now leaving the system overnight to boot up - so far, it has
autorun the MD arrays and detected the ReiserFS format).

System summary:
        Motherboard: ASUS A7V-E SE
        BIOS: 1007; set to IDE in "SATA Mode" (IDE or RAID)
        Kernel: 2.6.15.1 with CONFIG_SCSI_SATA_VIA
        Hard disks: 2 x WDC WD2500KS-00M Rev 02.0; Linux MD RAID1

Hangs are experienced followed by the following lines on the console:
        ata1: slow completion (cmd ef)
        ata2: slow completion (cmd ef)
                -- above messages occur once each per boot
        ata1: command 0x25 timeout, stat 0x50 host_stat 24
        ata2: command 0x25 timeout, stat 0x50 host_stat 24
                -- above messages occur numerous times,
                   perhaps even every block read

Other interesting bootup messages include numerous PCI: Via IRQ fixup
messages (presumably one per device, definitely including the SATA
controller).

dmesg and lspci -vvx will be sent through if the boot completes,
assuming the kernel log buffer is long enough to perform a dmesg
with information other than all the timeouts once the boot
completes.  Or, if the boot doesn't complete by tomorrow, I'll
look into building a kernel with significantly reduced SATA
command timeouts (and a larger kernel log buffer if required),
to try and get this information.

Any initial suggestions in the interim?  I need PCI Express
for a graphics card to support a Dell 3007FPW, avoided nForce4
due to excessive random corruption with the nForce4 and WD2500KS
drives under Windows in another system, and would really prefer
not to buy yet another motherboard, so I would really like
to get this working.

Random irrelevant evil thoughts: could Intel VT make BIOS hard
disk access viable for Linux by proxying disk accesses through
a second virtual machine?  Or even Windows SATA driver support
through SAMBA to a disk image on a Windows machine on a second
virtual machine?

David.
-- 
David Luyer
Pacific Internet (Australia) Pty Ltd
Business card: http://www.luyer.net/bc.html
Important notice: http://www.pacific.net.au/disclaimer/
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