Re: [Xenomai] Trying to get Xenomai on P1010RDB

[Charles Retailleau <charles.retailleau@axesseurope.com>]

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,

Le 16/08/2012 16:46, Lennart Sorensen a écrit :
> On Thu, Aug 16, 2012 at 04:30:39PM +0200, Charles Retailleau
> wrote:
>> Hi all, The patching/compilation/installation steps seem fine. 
>> But at the end I cannot have any Xenomai software running on the 
>> P1010RDB (I tried most of the provided test SW).
>> 
>> I focused on latency and tried to debug it. I get that:
>> 
>> Program received signal SIGILL, Illegal instruction. 0x0ffde120
>> in __xn_rdtsc () from ....xenomai/lib/libnative.so.3
>> 
>> It appears that the 'mftb/mftbu' instructions are in cause (cf.
>> the small test in attachment, the 1st part works but not the mftb
>> test). Furthermore when I check the core e500 ref manual 
>> http://cache.freescale.com/files/32bit/doc/ref_manual/E500CORERM.pdf
>>
>> 
MFTB appears has NOT being part of the instruction list.
>> 
>> Yet, Xenomai seems to work on P1020RDB which has the same core,
>> so I'm confused... What did I do wrong ?
>> 
>> I'm using Xenomai 2.6.1, linux 3.2.21 configured with
>> mpc85xx_defconfig (default options for the rest of it), 
>> Freescale's SDK 1.1.2 (that's the main difference between me and 
>> Lukasz Zemla's config on P1020RDB, so I'm trying to get the
>> latest 1.2)
> 
> mftb is a phased out instruction according to the powerpc 2.06 rev 
> B documentation.  mfspr is the prefered instruction to use instead
> on everything other than the old 603 and POWER3 CPUs.
> 
> It is quite possible the e500 hence doesn't support it.  According
> to http://cache.freescale.com/files/32bit/doc/app_note/AN3445.pdf
> it specificly does NOT have mftb.  Neither does the e300 core which
> is what we are using with xenomai (MPC8360e specificly).
>