Date: Mon, 23 Mar 2009 18:45:49 +0900 From: Weongyo Jeong <weongyo.jeong@gmail.com> To: Nathan Whitehorn <nwhitehorn@freebsd.org> Cc: freebsd-ppc@freebsd.org Subject: Re: Apple ATA DMA problems with ATAPI Message-ID: <20090323094549.GB3713@weongyo.cdnetworks.kr> In-Reply-To: <alpine.BSF.2.00.0903221941130.18715@banshee.munuc.org> References: <20090322180638.GA3708@narn.knownspace> <8B9483E9-D6D4-441E-9202-31FA34F5DA98@mac.com> <20090322215406.GA1257@narn.knownspace> <alpine.BSF.2.00.0903221941130.18715@banshee.munuc.org>
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On Sun, Mar 22, 2009 at 07:43:44PM -0500, Nathan Whitehorn wrote: > > On Sun, 22 Mar 2009, Justin Hibbits wrote: > > >On Sun, Mar 22, 2009 at 01:41:18PM -0700, Marcel Moolenaar wrote: > >> > >>On Mar 22, 2009, at 11:06 AM, Justin Hibbits wrote: > >> > >>>Well, it seems I was bitten by the ATA DMA problems from a few > >>>months back. > >> > >>Try disabling DMA for atapi in /boot/loader.conf and enable > >>it in /etc/sysctl.conf. For some reason, on my Mac Mini at > >>least, it helps to first program PIO and then program *DMA. > >> > >>YMMV, > >> > > > >It appears hw.ata.atapi_dma is a read-only tunable, so /etc/sysctl.conf > >has no > >effect on it, and only throws a warning about being unable to change it. > >It's > >working sufficiently as PIO, though. > > > > So it looks like this issue is limited to ATAPI devices, and as a result I > have one more stab in the dark. Apparently at least some of these > controllers die if you try to give them an ATAPI command with a length > that is not divisible by 16. I have a patch at > http://people.freebsd.org/~nwhitehorn/ata-alignment.diff that converts > such commands to PIO. Could you see if it works? > > If this fails, I'll apply a sledgehammer and force all ATAPI devices on > Apple controllers to PIO. FWIW I applied your patch then tried to rebuild kernel but it still encountered a panic in my iBook G4 without hw.ata.atapi_dma=0 during booting. My bug was: http://lists.freebsd.org/pipermail/freebsd-ppc/2009-February/003539.html regards, Weongyo Jeong
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