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Date: Tue, 30 Dec 2008 16:37:38 +0000
From: "Bruce M. Simpson" <bms@FreeBSD.org>
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To: "Andrey V. Elsukov" <bu7cher@yandex.ru>
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Cc: David Ehrmann <ehrmann@gmail.com>, freebsd-stable@freebsd.org,
	=?ISO-8859-1?Q?S=F8ren_Schmidt?= <sos@FreeBSD.org>
Subject: Re: SATA hotplug and AHCI
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Andrey V. Elsukov wrote:
> ...
> Linux's libata driver has a quirk for VIA AHCI:
>
> /* vt8251 doesn't clear BSY on signature FIS reception,
>  * request follow-up softreset.
>  */
>
> If i right understand it issues softreset for VIA controllers just
> after hardreset. And after softreset it is trying to read device 
> signature.
>
> FreeBSD CURRENT has similar code, but it is disabled by default.
> You can try install CURRENT and rebuild ata_ahci driver with AHCI_PM 
> option.
> May be it will help..
>

I'm glad this came up. When I asked a few weeks ago about SATA Hotplug 
support, I was asking because of a board with a VIA SATA controller I 
was planning to add drives too, on a JBOD basis.

Perhaps this hack can be backported to 7.x to actually make VIA 
controllers useful?

P.S. VIA's SATA RAID BIOS is a pile of poop, don't bother using VIA for 
RAID.

cheers
BMS