Using uaudio(4) on systems withoug ISA bus

Mathew Kanner mat at
Tue Apr 26 07:02:07 PDT 2005

On Apr 25, Tilman Linneweh wrote:
> Hi everyone,
> 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:

	Hi Tilman,
	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.
	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?

ps, i've removed sound the the list as I think it's only me at the

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