Re: kern/57362 (piixide / wd does not fall back to PIO4 after excessive DMA errors)

To: jdolecek%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost, gnats-admin%netbsd.org@localhost, jdolecek%NetBSD.org@localhost, ltning-netbsd%anduin.net@localhost
Subject: Re: kern/57362 (piixide / wd does not fall back to PIO4 after excessive DMA errors)
From: jdolecek%NetBSD.org@localhost
Date: Tue, 18 Jul 2023 07:20:58 +0000 (UTC)

Synopsis: piixide / wd does not fall back to PIO4 after excessive DMA errors

State-Changed-From-To: analyzed->feedback
State-Changed-By: jdolecek%NetBSD.org@localhost
State-Changed-When: Tue, 18 Jul 2023 07:20:58 +0000
State-Changed-Why:
Taylor's change to enable the ATA downgrade for LEGACY kernel should be enough.
Note the problem occurs if the hardware claims to support DMA, but actually
doesn't. There shouldn't be any SATA devices like that, and there should
be even very few ATA (IDE) devices like that.
Anything else to do?

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