Re: [Jack-Devel] jack2 on ARM - patch

On 01/01/2013 09:26 PM, Jeremy Jongepier wrote:
> On 01/01/2013 06:29 PM, Robin Gareus wrote:
>> Hi,
>>
>> jackd-1.9.10 (recent git) still crashes on ARM with a "Bus error". After
>> brief discussion on #jack, Nedko pointed out that packed structures are
>> still an issue. Attached patch resolves the issue. Tested working on
>> armv7, cortex-A8 and A10 platform.
>>
>> Cheers!
>> robin
>
> Now you guys rock! I'll see if I can get it running on my RPi. Would be
> awesome, then I can finally use it for something useful.
>
> Regards,
>
> Jeremy

Applied patch to the source package of jackd2 available for raspbian, 
rebuild, remounted /dev/shm and modified /etc/dbus-1/system.conf and 
guess what? JACK with my UA-25 on my Rpi! Great, thanks again!

Here's the recipe:

wget 
http://jack-audio.10948.n7.nabble.com/attachment/15962/0/jack2_armel.diff
apt-get source jackd2
cd jackd2-1.9.8~dfsg.4+20120529git007cdc37
patch -p1 -i ../jack2_armel.diff
dpkg-source --commit
dpkg-buildpackage -rfakeroot -uc -b
cd ..
sudo dpkg -i 
libjack-jackd2-0_1.9.8~dfsg.4+20120529git007cdc37-5_armhf.deb 
jackd2_1.9.8~dfsg.4+20120529git007cdc37-5_armhf.deb

Now add the following lines to /etc/dbus-1/system.conf:
   <policy user="pi">
        <allow own="org.freedesktop.ReserveDevice1.Audio1"/>
   </policy>

This depends on the sound device you're using, it could be different. 
Now remount /dev/shm:
sudo mount -o remount,size=128M /dev/shm

And if you're on a headless RPi:
export DBUS_SESSION_BUS_ADDRESS=unix:path=/run/dbus/system_bus_socket

Now you can fire up JACK but not in full-duplex, only capture or 
playback, so use -C or -P. This is probably because the ethernet adapter 
is also on the same usb bus. Maybe disabling it allows JACK to run in 
duplex mode, haven't tried it yet.

Jeremy

1357078158.27713_0.ltw:2,Sa <50E35E85.6050204 at autostatic dot com>