Date: Sun, 22 Mar 2009 17:54:06 -0400 From: Justin Hibbits <jrh29@alumni.cwru.edu> To: Marcel Moolenaar <xcllnt@mac.com> Cc: freebsd-ppc@freebsd.org Subject: Re: Apple ATA DMA problems with ATAPI Message-ID: <20090322215406.GA1257@narn.knownspace> In-Reply-To: <8B9483E9-D6D4-441E-9202-31FA34F5DA98@mac.com> References: <20090322180638.GA3708@narn.knownspace> <8B9483E9-D6D4-441E-9202-31FA34F5DA98@mac.com>
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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, > > -- > Marcel Moolenaar > xcllnt@mac.com > > > 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. - Justin
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