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Thanks for the update Jeremy but according to a user on jack-devel, JACK is
having probs running on the BBB too.
I may try J1 on my Pandaboard too but it'd be just out of curiosity to see
if it does work. The lack of ARM/NEON optimization in the LA stack
currently means I can't realistically use the Panda for what I like to do
with Linux audio. Wheezy is otherwise rock solid on it. I had to power it
down yesterday when we were doing some work on the house and it had an
uptime of 18.5 days. No great feat but I'm sure it would've been up for
much longer if given the chance.
If I was real gung-ho about JACK on ARM I'd prob consider one of the
Chromebooks - gone are the days when dev boards are the only option for
those wanting a modern ARM Linux machine.
On Fri, Jun 28, 2013 at 2:52 PM, Jeremy Jongepier wrote:
> On 06/19/2013 03:39 PM, Jeremy Jongepier wrote:
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Thanks for the update Jeremy but according to a user =
on jack-devel, JACK is having probs running on the BBB too.I may try J1 on my Pandaboard too but it'd be just out of curiosity =
to see if it does work. The lack of ARM/NEON optimization in the LA stack c=
urrently means I can't realistically use the Panda for what I like to d=
o with Linux audio. Wheezy is otherwise rock solid on it. I had to power it=
down yesterday when we were doing some work on the house and it had an upt=
ime of 18.5 days. No great feat but I'm sure it would've been up fo=
r much longer if given the chance.
If I was real gung-ho about JACK on ARM I'd prob conside=
r one of the Chromebooks - gone are the days when dev boards are the only o=
ption for those wanting a modern ARM Linux machine.
n Fri, Jun 28, 2013 at 2:52 PM, Jeremy Jongepier <email@example.com=
On 06/19/2013 03:39 PM, Je=
remy Jongepier wrote:
On 06/19/2013 12:08 AM, Dan MacDonald wrote:
That's what I expected, seeing how little success I've had on my
with J2 git. Have you tried J1 too?
Ok, got Jack1 running. Recompiled the kernel without debugging and
disabled WiFi. I now see I can also tweak the IRQ threads, nice.
Just an update. Getting things stable is quite some work actually but I'=
;m slowly getting there. I've stripped the kernel config a bit further =
and have a good starting point now. Some findings:
* RT patch doesn't apply cleanly. I've hacked my way through it but=
can't get it to compile.
* I've tried using threadirqs but then the stick wouldn't boot (cou=
ldn't find any rootfs to load from MMC). Applied this patch: http://www.spinics.net/lists/linux-rt-users/msg08062.html
Then I get threaded IRQs but it's not much of an improvement, the USB I=
RQ that has the WiFi connected to it consumes a lot of CPU and I can't =
get JACK to run stable. I did try prioritizing IRQs with rtirq but it didn&=
#39;t make any difference, the board seems to run better without threaded I=
* Tried dwc_otg.speed=3D1 as a kernel parameter, no improvement.
* This thing doesn't have serial console access, I've tried all pos=
sible pads, vias and pins but no joy :( I did manage to solder a button on =
the board that allows me to directly boot into flash mode which is already =
* No ethernet access, only WiFi. But enabling WiFi means JACK won't run=
properly. Also tried an external USB dongle, same problems basically.
* So I have to work using the HDMI connection and a keyboard. Had to disabl=
e blanking otherwise JACK would crash.
Well, that last example sums it all up I guess, this board isn't really=
made for doing real-time audio. Unless people prove me wrong, I'd love=
to hear what other people's experiences are. Any tips, ideas, suggesti=
ons? I'm now glazing at amsynth 1.4.0 running headless while JACK occas=
ionally spits out 'delay of .... usecs exceeds estimated spare time of =
.....; restart ...' messages and that with jackd -P84 -p32 -t2000 -dals=
a -n3 -p128 -s
I HAVE to use the ALSA -s (softmode) option otherwise the whole USB stack l=
ocks up. Pffff, maybe I should buy a board that does work, like the pcDuino=
or BeagleBone Black.
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