From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Wed, 08 Jan 2014 09:21:53 +0100
From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
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Subject: Re: [Xenomai] Altera Cyclone V
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To: Charles Steinkuehler <charles@steinkuehler.net>
Cc: xenomai@xenomai.org

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On 01/08/2014 05:04 AM, Charles Steinkuehler wrote:
> 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.

Have you tried enabling workaround for broken gas?
CONFIG_THUMB2_AVOID_R_ARM_THM_JUMP11?

Also note that you may want to use a toolchain with hard floating
points. I use linaro toolchains for instance.


- -- 
                                                                Gilles.
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