Date: Tue, 24 Apr 2007 11:32:00 -0700 From: "Josh Carroll" <josh.carroll@gmail.com> To: "Thomas Quinot" <thomas@freebsd.org> Cc: freebsd-scsi@freebsd.org, bug-followup@freebsd.org Subject: Re: kern/103602: drive gets wedged on READ CD CAPACITY if no disc is in Message-ID: <8cb6106e0704241132vfa6b312s3b4cbea0c823b796@mail.gmail.com> In-Reply-To: <20070424165843.GD7087@melamine.cuivre.fr.eu.org> References: <8cb6106e0703261318o120c620ar6b2461802632fc01@mail.gmail.com> <4608A35E.3010404@samsco.org> <8cb6106e0703262157m7fd0ae96p3bb5368af797dc6b@mail.gmail.com> <460AA9E3.4030106@samsco.org> <8cb6106e0703281531k4c5bebecp5566c64c8f458a74@mail.gmail.com> <8cb6106e0704030039if46397fvfc993d9c9e19e1fc@mail.gmail.com> <8cb6106e0704032107w457026b1t1e04ed11008af48a@mail.gmail.com> <20070424162008.GA7087@melamine.cuivre.fr.eu.org> <8cb6106e0704240929j38178df6k1b6391446c69a2ae@mail.gmail.com> <20070424165843.GD7087@melamine.cuivre.fr.eu.org>
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> *And* you mentioned, very early in this PR, that disabling DMA > altogether made the problem disappear. So, let's try something: enable > DMA only for READ and WRITE commands (where it's most useful). > > Apparently it's not a completely unhead-of situation that some drives > have problems with DMA for commands other than READ and WRITE, see: > http://www.mail-archive.com/linux-ide@vger.kernel.org/msg05425.html > Hi Thomas, Unfortunately, the other patches along with this produced a panic about a MTX not owned, and removing the CAMDEBUG options resulted in a different panic about ATAPICAM not locked. I'll look more closely tonight to see if I can get the kernel to load without a panic. Thanks, Josh
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