Re: [Xenomai] Trying to get Xenomai on P1010RDB

["Lennart Sorensen" <lsorense@csclub.uwaterloo.ca>]

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).

-- 
Len Sorensen