Date: Fri, 25 Apr 2014 22:41:34 +0200 From: Bernd Walter <ticso@cicely7.cicely.de> To: Hans Petter Selasky <hps@selasky.org> Cc: freebsd-arm@freebsd.org, Scott Aitken <freebsd-lists-3@thismonkey.com> Subject: Re: USB audio device on Raspberry Pi - link_elf: symbol isa_dmastatus undefined Message-ID: <20140425204134.GA458@cicely7.cicely.de> In-Reply-To: <535A8AEA.1000100@selasky.org> References: <20140425154430.GA76168@utility-01.thismonkey.com> <535A8AEA.1000100@selasky.org>
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On Fri, Apr 25, 2014 at 06:18:50PM +0200, Hans Petter Selasky wrote: > On 04/25/14 17:44, Scott Aitken wrote: > >Hi all, > > > >I'm hoping to use my RPi/FreeBSD as an Airplay device to my amplifier which > >presents a USB DAC. > > > > Hi, > > Audio devices which use ISOCHRONOUS data transport are not supported i > FreeBSD, because the RPi uses very small buffers and has to handle 8000 > IRQ/s typically for ISOC transfers. This looks more like uaudio module fails to load because it depends on sound module, which itself then requires ISA bus support in kernel. The sound.ko shouldn't require ISA when build on ARM. It might work to compile the drivers into the kernel. If it uses ISOCHRONOUS, then that's an unrelated problem IMO. Do all uaudio devices use isochronous endpoints or is it an optional thing? If it is optional, then he might have a chance. -- B.Walter <bernd@bwct.de> http://www.bwct.de Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.
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