Re: RT tests on OMAP3

[Kevin Hilman <khilman@deeprootsystems.com>]

Cliff Brake <cliff.brake@gmail.com> writes:

> On Mon, Aug 31, 2009 at 11:16 PM, Cliff Brake<cliff.brake@gmail.com> wrote:
>
>> Applying
>>
>> http://cgit.openembedded.org/cgit.cgi/openembedded/diff/recipes/linux/linux-omap-2.6.29/0001-implement-TIF_RESTORE_SIGMASK-support-and-enable-the.patch?id=1f0d91e152f16fbd40bb2fb3c44a30d774d4dede
>>
>> Seems to fix or mask the udev problems.  But, with preempt-rt, and
>> EHCI enabled, I still get messages continually scrolling:
>
> A few more notes, the above patch is not required to make the PXA270
> work.  Without EHCI enabled, the system boots and performs fairly
> normal (I'm able to log in, etc).

This looks to me like a case of poor (or non-existent) locking in the
USB/EHCI driver, resulting in some corruption since the PC is at a
bogus address (0x14).

Does your PXA270 use the same EHCI driver?  I assume not.

I've been using -rt on a basic OMAP3 kernel, but have not enabled
EHCI so haven't seen this.

Might be useful to enable some of the in-kernel lock debugging to
see if it turns up anything.

Kevin

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