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Date: Sun, 15 Feb 2009 14:42:41 +0200
From: Alexander Motin <mav@FreeBSD.org>
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Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org,
	src-committers@freebsd.org
Subject: Re: booting with ATA-AHCI now broken
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Gary Jennejohn wrote:
> The latest commit to dev/ata/chipsets/ata-ahci.c totally breaks
> booting on my machine.
> 
> I didn't save the commit message so I can't quote the exact commit
> revision number.
> 
> _Every_ ata port now times out.
> 
> Here the relevant bits from pciconf:
> 
> atapci0@pci0:0:17:0:    class=0x010601 card=0xb0021458 chip=0x43911002 rev=0x00 hdr=0x00
>     vendor     = 'ATI Technologies Inc'
>     class      = mass storage
>     subclass   = SATA

According to Linux drivers, this chip has bug with port multiplier 
probing which this commit may trigger. Can you try to change 
'ata_ahci_softreset(dev, ATA_PM)' with 'ata_ahci_softreset(dev, 0)' in 
ata-ahci.c to check it?

-- 
Alexander Motin