On Fri, June 28, 2013 11:52 pm, Jeremy Jongepier wrote: > On 06/19/2013 03:39 PM, Jeremy 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 >>> Pandaboard >>> 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. >> >> Jeremy > > 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. What are the error messages? > * I've tried using threadirqs but then the stick wouldn't boot (couldn'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 > IRQ 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't make any difference, the board seems to run better without > threaded IRQs. > * Tried dwc_otg.speed=1 as a kernel parameter, no improvement. > * This thing doesn't have serial console access, I've tried all possible > 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 > quite convenient. > * No ethernet access, only WiFi. But enabling WiFi means JACK won't run > properly. Also tried an external USB dongle, same problems basically. What is the wifi chipset? > * So I have to work using the HDMI connection and a keyboard. Had to > disable 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, > suggestions? I'm now glazing at amsynth 1.4.0 running headless while > JACK occasionally spits out 'delay of .... usecs exceeds estimated spare > time of .....; restart ...' messages and that with jackd -P84 -p32 > -t2000 -dalsa -n3 -p128 -s What happens at higher period values and if you disable duplex mode? > I HAVE to use the ALSA -s (softmode) option otherwise the whole USB > stack locks up. Pffff, maybe I should buy a board that does work, like > the pcDuino or BeagleBone Black. > > Regards, > > Jeremy > _______________________________________________ > Linux-audio-user mailing list > Linux-audio-user@xxxxxxxxxxxxxxxxxxxx > http://lists.linuxaudio.org/listinfo/linux-audio-user > -- Patrick Shirkey Boost Hardware Ltd _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
