Re: [Xenomai] Altera Cyclone V

[Charles Steinkuehler <charles@steinkuehler.net>]

On 1/7/2014 6:51 PM, Charles Steinkuehler wrote:
> 
> Thanks for the details!  My to-do list just got longer...  :)
> 
> I'll do some testing (on the BeagleBone) and post the results, but it
> might take a couple of days.

I did a quick check with the BeagleBone kernels I've already built (no
IPipe debugging) and I'm getting much better results than the last time
I tested.  Typical latency is around 20 uS, and worst case is about 45
uS (although I obviously didn't run overnight!).

I've got about half of the suggested kernel settings "correct" already,
but the others need to be tweaked (including disabling SMP, thanks for
the hint!).  I tried using all the recommended settings, but the kernel
build failed when linking:

  LD      init/built-in.o
arch/arm/kernel/built-in.o: In function `__irq_usr':
:(.kprobes.text+0x3c2): relocation truncated to fit: R_ARM_THM_JUMP19
against symbol `__ipipe_ret_to_user_irqs_disabled' defined in .text
section in arch/arm/kernel/built-in.o
arch/arm/kernel/built-in.o: In function `ret_from_exception':
:(.kprobes.text+0x600): relocation truncated to fit: R_ARM_THM_JUMP19
against symbol `__ipipe_ret_to_user_irqs_disabled' defined in .text
section in arch/arm/kernel/built-in.o
make: *** [vmlinux] Error 1

The link error goes away if I disable CONFIG_THUMB2_KERNEL, which wasn't
set in the original kernel config.

I'll report details when I get some debug kernels tested and capture the
requested data.

-- 
Charles Steinkuehler
charles@steinkuehler.net

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