[ECOS] Re: Problems with "Scheduler lock not zero"

Øyvind Harboe oyvind.harboe@zylin.com
Wed Nov 8 15:31:00 GMT 2006

On 11/7/06, Andrew Lunn <andrew@lunn.ch> wrote:
> Hi Folks
> I think it is unlikley this is your problem, but i will mention it
> anyway. I once had an assertion failure in the same place. It was
> caused by a thread exiting with the scheduler locked.
> Another thing to check is do you have an spurious interrupts. There
> has been problems on the ARM platform not correctly dealing with
> this. Since spurious interrupts generally means broken hardware, its
> not the easiest thing to test and debug.

After fixing a bug in our DDR controller(implemented in FPGA), we can
no longer reproduce the problem..... Crossing fingers.... :-)

It is hard enough to tell how a system behaves when it works, but to
explain what possible a *nearly* working DDR controller could result
in, is pretty much impossible.

The main symptom of our broken DDR controller was that the whole
system locked up. We'll run some more overnight testing, but it looks
like the  "Scheduler lock not zero" assert failure was just another,
albeit unfatohmable, manifestation of that same problem.

Øyvind Harboe

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