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Date:      Tue, 6 Sep 2016 09:44:08 +0200
From:      Hans Petter Selasky <hps@selasky.org>
To:        Adrian Chadd <adrian@freebsd.org>, =?UTF-8?B?T3RhY8OtbGlv?= <otacilio.neto@bsd.com.br>
Cc:        "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org>, "freebsd-wireless@freebsd.org" <freebsd-wireless@freebsd.org>
Subject:   Re: Small example program shut down urtwn
Message-ID:  <65f68e6c-a1cc-73ec-f3f0-048d4f339ad8@selasky.org>
In-Reply-To: <CAJ-Vmokotf8cf2HEDhwc6WYzMNLGoj-ZeV4UAxJFDjD6=yu76w@mail.gmail.com>
References:  <fea1f0b8-d17c-5fc1-9593-6d8a6e2032db@bsd.com.br> <CAJ-Vmokotf8cf2HEDhwc6WYzMNLGoj-ZeV4UAxJFDjD6=yu76w@mail.gmail.com>

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On 09/06/16 06:47, Adrian Chadd wrote:
>  missing some bus
> barriers for ARM or something?

FYI: Most of the USB control and data memory is coherently allocated and 
don't need barriers. You can try capturing a trace using usbdump, of the 
traffic on your device, and see where it hangs:

usbdump -i usbusX -f Y -s 65536

--HPS



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