Re: [Jack-Devel] jackd2 bus error on openwrt
I have found that on this embedded platform, they don't define __arm__
they define __mips__ below is the output from /proc/cpuinfo.
I have a patch for jack1, however I am not sure that packing is the
problem ... how can I tell ?
I have tried clearing the packing definition with jackd 2 and I still
get "bus error".
What I do find however is that when I start jackd and then netjack one I
can't get any I2S signal. When I use aplay on the device I do get I2S
audio signal. Is there a way to put signal through jack on the device ?
Here are the available jack commands on the device :
jack_alias jack_load jack_samplerate
jack_bufsize jack_load_test jack_session_notify
jack_connect jack_lsp jack_thread_wait
jack_disconnect jack_midi_dump jack_transport
jack_evmon jack_monitor_client jack_unload
jack_freewheel jack_netsource jack_wait
jack_iodelay jack_property jackd
thanks
Matt
.... begin cat /proc/cpuinfo ....
system type : Atheros AR9330 rev 1
processor : 0
cpu model : MIPS 24Kc V7.4
BogoMIPS : 265.42
wait instruction : yes
microsecond timers : yes
tlb_entries : 16
extra interrupt vector : yes
hardware watchpoint : yes, count: 4, address/irw mask: [0x0ffc,
0x0ffc, 0x0ffb, 0x0ffb]
isa : mips1 mips2 mips32r1 mips32r2
ASEs implemented : mips16
shadow register sets : 1
kscratch registers : 0
package : 0
core : 0
VCED exceptions : not available
VCEI exceptions : not available
On 16/08/15 21:10, Adrian Knoth wrote:
> On Sun, Aug 16, 2015 at 09:40:18AM +1000, Matt Flax wrote:
>
> Hi!
>
>> I am revisiting running jackd2 on openwrt using another ARM
>> architecture. It is compiled from git commit
>> cd59d67847afb57393a1db6d39badd94a4973f6e
>>
>> When jack starts I still get bus error :
>> root@OpenWrt:/# jackd -v -d alsa
>> jackdmp 1.9.11
>> Bus error
>>
>> Not sure what to do next to debug, beyond hacking console outputs
>> into the command line.
> You are most likely dealing with unaligned memory access here, usually
> mis-aligned structs. I'm somewhat surprised that it didn't surface on
> other ARM platforms before, but then again, there are many variations of
> "ARM".
>
> Further reading:
>
> https://www.kernel.org/doc/Documentation/arm/mem_alignment
>
> specifically:
>
> echo 1 > /proc/sys/debug/alignment
>
> and then check the syslog.
>
> If this confirms that it's unaligned access, you know what to look for.
>
> A good and comprehensive read:
>
> http://www.catb.org/esr/structure-packing/
>
> Maybe "pahole" in the tools section can be of further help, but let's
> not jump to conclusions.
>
> I've only skimmed the following link, but it also seems like a good
> introduction to memory alignment:
>
> https://lwn.net/Articles/259732/
>
> In other words: set aside half a day for hunting this down.
>
> Last not least: ARM behaviour may be different depending on the compiler
> flags. I vaguely recall different CPU targets behaving differently. I
> assume you used the correct flags that match your platform, endianess
> etc.
>
>
>
> Cheers
>
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#define __QQ_IBIT__ 0
#define __ATOMIC_ACQ_REL 4
#define __ATOMIC_RELEASE 3
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