Date: Tue, 26 Apr 2005 16:57:34 +0200 From: Tilman Linneweh <tilman@arved.at> To: Mathew Kanner <mat@cnd.mcgill.ca> Cc: freebsd-usb@freebsd.org Subject: Re: Using uaudio(4) on systems withoug ISA bus Message-ID: <20050426145734.GC2894@arved.at> In-Reply-To: <20050426140134.GA11709@cnd.mcgill.ca> References: <20050425215452.GB2894@arved.at> <20050426140134.GA11709@cnd.mcgill.ca>
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* Mathew Kanner [2005-04-26 16:02]: > > I have tried to use my USB Headphone on my Mac mini. > > > > Unfortunately the sound system seems to require an ISA Bus, because in > > channel.c sndbuf_dmasetdir and sndbuf_dmabounce are used, which are only > > compiled if there is an isa device. > > > > Without knowing what i am doing i commented out these lines and everything > > seems to compile and work, apart from mixer(8) saying Device not configured > > and the following LOR on the first sound output: > > I think you have two very interesting issues here. I'm busy > right now but I'll try to get time to look at them, don't give up if > you don't here from me :) I anticipate this hump will be over in a > couple of days but maybe through 'till the weekend > 1/ There is a dependency on ISA in the generic PCM code. This > is news to me and we need to get rid of it. Well, i was a bit surprised too, because i have not figured out yet, how yongari resolved this for the sparc64 cs4231 driver. (His original patch at http://lists.freebsd.org/pipermail/freebsd-sparc64/2004-July/001823.html works around the problem, see the first XXX, but he did not commit this part) Unfortunately i don't understand much of the soundsystem code yet. > 2/ There is a lock order reversal. We haven't seen one of > these in a while for the sound code. > > Just to clear things up for me, when you say Mac mini, this > means you aren't running the standard i386/amd64, right? > --Mat Exactly, this is FreeBSD/powerpc. Thanks for your quick reply regards tilman
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