linux-kernel - Re: [PATCH] libata: fix combined mode (was Re: Happy New Year (and v2.6.20-rc3 released))

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Date:	Tue, 2 Jan 2007 23:27:06 +0000
From:	Alan <alan@...rguk.ukuu.org.uk>
To:	Jeff Garzik <jgarzik@...ox.com>
Cc:	Linus Torvalds <torvalds@...l.org>,
	Alessandro Suardi <alessandro.suardi@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] libata: fix combined mode (was Re: Happy New Year (and
 v2.6.20-rc3 released))

> 2.6.0 - 2.6.19:  libata guarantees that all PCI BARs are reserved to the 
> libata driver.

Please read the code Jeff. The old IDE quirk code in the PCI layer blanked
BAR 0 to BAR 3 of a compatibility mode controller

You then request_region 0x1f0 and 0x170 (BAR 0 and BAR 2) directly. You
never request the legacy BAR 1 and BAR 3 because they were erased by the
PCI quirk code and thus never claim the other port. Thats been a bug since
day one but it never seemed worth fixing in the short term.

Alan
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