Re: [Xenomai] Trying to get Xenomai on P1010RDB

[Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>]

On 08/17/2012 05:37 PM, Philippe Gerum wrote:
> On 08/17/2012 05:11 PM, Gilles Chanteperdrix wrote:
>> On 08/17/2012 05:02 PM, Philippe Gerum wrote:
>>> On 08/17/2012 04:41 PM, Gilles Chanteperdrix wrote:
>>>> On 08/17/2012 04:24 PM, Charles Retailleau wrote:
>>>>> Thanks Lennart that was very useful, it now works.
>>>>> Here is the little patch I made, yet I couldn't find a switch to force
>>>>> it for core e500/e500xx only...
>>>>>
>>>>>
>>>>> --- ./xenomai-2.6.1.orig/include/asm-powerpc/syscall.h	2011-11-09
>>>>> 13:21:36.000000000 +0100
>>>>> +++ ./xenomai-2.6.1.mine/./include/asm-powerpc/syscall.h	2012-08-17
>>>>> 15:47:28.387435909 +0200
>>>>> @@ -167,9 +167,9 @@
>>>>>    	} u;
>>>>>    	unsigned long __tbu;
>>>>>
>>>>> -	__asm__ __volatile__("1: mftbu %0\n"
>>>>> -			     "mftb %1\n"
>>>>> -			     "mftbu %2\n"
>>>>> +	__asm__ __volatile__("1: mfspr %0,269\n"
>>>>> +			     "mfspr %1,268\n"
>>>>> +			     "mfspr %2,269\n"
>>>>>    			     "cmpw %2,%0\n"
>>>>>    			     "bne- 1b\n":"=r"(u.v[0]),
>>>>>    			     "=r"(u.v[1]), "=r"(__tbu));
>>>>> Thanks to all for your help
>>>>> Charles,
>>>>
>>>> If I understand correctly, this patch breaks old powerpcs. So, do we
>>>> have a compilation constant allowing to know whether we are compiling
>>>> for an old or new powerpc?
>>>>
>>>
>>> For the sake of completeness, we could condition mftb to CONFIG_POWER3,
>>> all others we care for (i.e. >= ISA 2.01) do support mfspr 268.
>>>
>>
>> is CONFIG_POWER3 available when configuring user-space support?
>>
> 
> No, but actually, I never ported Xenomai to power3 and will likely never 
> do this. It's the early 64bit server architecture; we won't officially 
> support any 64bit platform which does not comply with ISA 2.04 at least 
> anyway. Best effort would be to depend on a gcc define built-in for 
> mcpu=power3 if any.
> 

Ok. According to ppc64-linux-gcc from ELDK 4.2, all architectures above
power4 have _ARCH_PWR4 defined.

-- 
					    Gilles.