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Date: Wed, 04 Jun 2014 15:10:02 +0200
From: Hans Petter Selasky <hps@selasky.org>
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To: Yoshiro MIHIRA <sanpei.ml@gmail.com>, freebsd-arm@freebsd.org
Subject: Re: only issue on FreeBSD/arm(beaglebone black) with multi channel
 USB audio device.
References: <CALwmBx1STSve8DmM46O7x1Kz-R8HmTcnTtAkyxUcKob8cb4EUQ@mail.gmail.com>
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On 06/04/14 15:03, Yoshiro MIHIRA wrote:
> I have multi-channel USB audio device.
>
> *1 Kyo-On DIGI(sorry,this page was writtin in Japanese)
> http://www.area-powers.jp/product/usb_product/product/kyo-on/u1soundt4.html
>
> I can use this device without issue on **FreeBSD/i386-current**[OK].
> (only I set below setting in /boot/loader.conf
> hw.usb.uaudio.default_
> channels=16
>
> [FYI] we discussed below thread.
> http://comments.gmane.org/gmane.os.freebsd.devel.usb/6213
>
> I tried to use this USB audio on **FreeBSD/arm BeagleBone Black** same
> source tree(r267049).
> However I have noise sound **playback** sound[NG](mpg123 and wavplay).
> If I **record** this device on BeagleBone Black, there is no issues.
>
> If I use 2ch USB audio device, there is no issues on BeagleBone Black.
>
> Does someone have any idea to use this device on BeagleBone Black?
>

Hi,

Can you give some more information about your USB audio device:

High Speed or Full Speed?

What USB controllers are used?

There are some limitations currently, that high-payload isochonous 
transfers are not fully supported by the non ehci/ohci/uhci/xhci 
controllers. That probably explains why only 2-channels are working.

--HPS