Re: [Xenomai] Hung task on Xenomai patched ARM 3.8.13 BeagleBone Kernel

[Charles Steinkuehler <charles@steinkuehler.net>]

On 10/16/2013 10:58 AM, Gilles Chanteperdrix wrote:
> On 10/16/2013 05:25 PM, Charles Steinkuehler wrote:
>> On 10/16/2013 7:52 AM, Charles Steinkuehler wrote:
>>> Anyway, are there any in-between steps I can test with the kernel that
>>> might help isolate what code to go over in the mmc driver?  Anything
>>> between "no xenomai patches" and "patched and configured to run xenomai"
>>> might potentially be enlightening.
>>
>> I built and tested a patched kernel that has no xenomai configure
>> options enabled:
>>
>> # CONFIG_XEN is not set

Oops...too quick with the cut-and-paste.  This is the configuration I
tested with that still fails.

CONFIG_IPIPE_WANT_ACTIVE_MM=y
CONFIG_IPIPE_ARM_KUSER_TSC=y
CONFIG_IPIPE=y
CONFIG_IPIPE_LEGACY=y
CONFIG_IPIPE_CORE=y
CONFIG_IPIPE_CORE_APIREV=2
CONFIG_IPIPE_TARGET_APIREV=1
CONFIG_IPIPE_HAVE_HOSTRT=y
CONFIG_IPIPE_DELAYED_ATOMICSW=y
# CONFIG_IPIPE_DEBUG is not set

# CONFIG_XENOMAI is not set
CONFIG_XENO_GENERIC_STACKPOOL=y
CONFIG_XENO_FASTSYNCH_DEP=y
CONFIG_XENO_FASTSYNCH=y

> CONFIG_XEN is for Xen, not Xenomai. The interesting steps are:
> - CONFIG_IPIPE enabled with CONFIG_XENOMAI disabled
> - patched kernel with CONFIG_IPIPE off and CONFIG_XENOMAI off.

So it looks like I tried the first option (ipipe enabled, xenomai
disabled, result = still broken), I'll try disabling ipipe as well and
see what happens.

> In addition to the troubleshooting guide, you may find the following
> documentation useful:
> https://www.xenomai.org/index.php/I-pipe-core:ArmPorting

Thanks!

> If the issue is not a timer issue, and it does not seem to be, the most
> probable explanation is that either the MMC driver or the interrupt
> controller does not like receiving interrupts while they are masked. In
> this case, you will find that the patched kernel does not work with
> CONFIG_IPIPE but works with CONFIG_IPIPE off and CONFIG_XENOMAI off.
> Do you know if the interrupt is level or edge triggered?

I don't know much detail yet, I'm still crawling around the driver code
and trying to make sense of things.

I'll test with ipipe disabled, go through the Arm Porting guide, and see
where that gets me...

Many thanks for all the help!

-- 
Charles Steinkuehler
charles@steinkuehler.net

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