Date: Mon, 23 Mar 2009 10:07:57 -0700 From: Marcel Moolenaar <xcllnt@mac.com> To: Justin Hibbits <jrh29@alumni.cwru.edu> Cc: freebsd-ppc@freebsd.org Subject: Re: Apple ATA DMA problems with ATAPI Message-ID: <27BA1256-55A2-4E9E-9228-F1DC12EBE2A7@mac.com> In-Reply-To: <20090322215406.GA1257@narn.knownspace> References: <20090322180638.GA3708@narn.knownspace> <8B9483E9-D6D4-441E-9202-31FA34F5DA98@mac.com> <20090322215406.GA1257@narn.knownspace>
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On Mar 22, 2009, at 2:54 PM, 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. >> > 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. Hmmm... I misremembered. Use atacontrol to set the mode: mini-g4% sudo atacontrol mode acd0 wdma2 current mode = WDMA2 FYI, -- Marcel Moolenaar xcllnt@mac.com
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