Re: [RTnet-developers] ppc/powerpc ambiguity while cross-compiling rtnet

[Wolfgang G. <wg...@gr...>]

Wolfgang Grandegger wrote:
> Jan Kiszka wrote:
>> Giammarco Zacheo wrote:
>>> Hi,
>>> while compiling rtnet 0.9.11 for a mpc5200-based (powerpc) board with
>>> xenomai 2.4.8 on a denx-2.6.29.4 kernel, i had problems while running
>>> the configure script, which wasn't able to find Xenomai headers in the
>>> kernel tree. This is due to the fact that the configure script is
>>> still looking for the arch/ppc obsoleted directory.
>>>
>>> The following patch worked for me, but I'm afraid this could break
>>> compatibility with older kernels and/or RTAI/Xenomai releases. There's
>>> probably a better way to do this. Any ideas?
>>>
>>> Cheers,
>>> Giammarco
>>>
>>> --- a/configure.ac
>>> +++ b/configure.ac
>>> @@ -58,10 +58,14 @@ case "$host" in
>>>         RTNET_TARGET_ARCH=arm
>>>         wanted_kernel_arch=CONFIG_ARM
>>>         ;;
>>> -    powerpc-*|ppc-*)
>>> +    ppc-*)
>>>         RTNET_TARGET_ARCH=ppc
>>>         wanted_kernel_arch=CONFIG_PPC
>>>         ;;
>>> +    powerpc-*)
>>> +        RTNET_TARGET_ARCH=powerpc
>>> +        wanted_kernel_arch=CONFIG_PPC
>>> +        ;;
>>> #    mips-*|mipsel-*)
>>> #       RTNET_TARGET_ARCH=mips
>>> #       wanted_kernel_arch=CONFIG_MIPS
>>>
>> Wolfgang, can you check if it breaks anything (specifically 2.4)?
> 
> This does not work for Kernels using the arch/ppc tree. Retrieving the
> real ARCH from $host (powerpc-unknown-linux-gnu in my case) gives always
> "powerpc". Either we provide a configuration parameter "--arch=" or we
> try to retrieve ARCH from the kernel tree, e.g. by checking "include/asm".

Giammarco, does the patch below work for you?

Wolfgang.

---
 configure.ac |    9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

Index: rtnet/configure.ac
===================================================================
--- rtnet.orig/configure.ac
+++ rtnet/configure.ac
@@ -59,7 +59,7 @@ case "$host" in
         wanted_kernel_arch=CONFIG_ARM
         ;;
     powerpc-*|ppc-*)
-        RTNET_TARGET_ARCH=ppc
+        RTNET_TARGET_ARCH=powerpc
         wanted_kernel_arch=CONFIG_PPC
         ;;
 #    mips-*|mipsel-*)
@@ -225,6 +225,13 @@ else
     AC_MSG_RESULT([$RTEXT_LINUX_DIR (kernel ${RTEXT_LINUX_VERSION}${CONFIG_SMP:+-SMP} + Xenomai)])
 fi
 
+# Fixup real arch for powerpc
+if test "${RTNET_TARGET_ARCH}" = "powerpc" ; then
+   AC_MSG_CHECKING([for real PowerPC arch])
+    readlink ${CONFIG_RTNET_LINUX_DIR}/include/asm | grep -q ppc && RTNET_TARGET_ARCH="ppc"
+    AC_MSG_RESULT([$RTNET_TARGET_ARCH])
+fi
+
 #
 # from now we think we've found some RT-extension, so if we got an error
 # it will be fatal, thus exit with AC_MSG_ERROR