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Date: Mon, 10 Sep 2007 09:34:32 +0400
From: "Andrey V. Elsukov" <bu7cher@yandex.ru>
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To: Dave Grochowski <malus.x@gmail.com>
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Cc: freebsd-bugs@FreeBSD.org
Subject: Re: kern/111699: [sata] SATA drives on an Asus A8V-MX are no longer
 detected on 7.0-CURRENT (regression)
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Dave Grochowski wrote:
>  The attached patch fixes the problem for me. The value for VIAAHCI 
>  should probably be 0x0C00 instead of 0x0800, but I do not know if this 
>  will have any ramifications for future AHCI capable VIA chipsets.

Hm.. VIAAHCI & VIABAR == 0.
This changes disable AHCI.

>  --- /usr/src/sys/dev/ata/ata-chipset.c.orig	2007-09-09 21:01:35.000000000 -0400
>  +++ /usr/src/sys/dev/ata/ata-chipset.c	2007-09-09 21:02:12.000000000 -0400
>  @@ -5098,7 +5098,7 @@
>        { ATA_VIA6420,   0x00, 7,      0x00,    ATA_SA150, "6420" },
>        { ATA_VIA6421,   0x00, 6,      VIABAR,  ATA_SA150, "6421" },
>        { ATA_VIA8237A,  0x00, 7,      0x00,    ATA_SA150, "8237A" },
>  -     { ATA_VIA8251,   0x00, 0,      VIAAHCI, ATA_SA300, "8251" },
>  +     { ATA_VIA8251,   0x00, 0,      VIAAHCI & VIABAR, ATA_SA300, "8251" },
>        { 0, 0, 0, 0, 0, 0 }};
>       char buffer[64];

Can you show verbose dmesg from RELENG_6 (without this patch)?

-- 
WBR, Andrey V. Elsukov