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Date: Wed, 24 Sep 2008 15:32:04 +0200
From: "Marco Trillo" <marcotrillo@gmail.com>
To: "Nathan Whitehorn" <nwhitehorn@freebsd.org>
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Cc: freebsd-ppc@freebsd.org
Subject: Re: Call for testers: Apple ATA DMA
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Hi,

On Wed, Sep 24, 2008 at 3:27 PM, Nathan Whitehorn
<nwhitehorn@freebsd.org> wrote:
>
> Ugh. I really don't know, and am flying blind without hardware. If you
> disable ATAPI DMA or the macio controller, does ad0 at least work?
> -Nathan
>

I reverted the ata_macio.c patch and now Kauai uses DMA just fine! ad0
now works in UDMA100 mode without any errors :-)

ata0 mem 0x20000-0x20fff,0x8800-0x88ff irq 24,12 on macio0
ata0: [ITHREAD]
ata1: <Intrepid Kauai ATA Controller> mem 0xf5004000-0xf5007fff irq
39,1 at device 13.0 on pci2
ata1: [ITHREAD]
acd0: DVDR <HL-DT-ST RW/DVD GCC-4481B/2.05> at ata0-master BIOSPIO
ad0: 38166MB <Seagate ST340015A 3.01> at ata1-master UDMA100

And indeed the ad0 disk performance is much better. Thank you!

So it looks like an ata_macio specific problem.

Regards,
Marco.