Jan Kiszka wrote:
Wolfgang Grandegger wrote:
Jan Kiszka wrote:
Wolfgang Grandegger wrote:
Jan Kiszka wrote:
Wolfgang Grandegger wrote:
Hi Jan,
I have now finally a RTnet running on MPC860/FCC <-> MPC8260/EEPRO100.
Next I will test MPC860/SCC <-> MPC8260/FCC. A few fixes are
needed, one
with the compiler flags for module compilation. I think we should use
the same flags as the kernel uses to build it's modules. In old
Xenomai
or RTAI there was a way to get them automatically. What do you think?
Yes, it's probably best to port this into current RTnet. Or is there an
official interface now in recent 2.4 kernels to obtain them?
I don't know. Is there one in 2.6?
Not that I know. It's not needed because you build via
"make -C <kernel_src> SUBDIRS=<your_module_src> modules",
using the original make rules of the kernel. For me the question is how
other external modules for 2.4 handle this. They all have the same
problem like we do now.
Yes, and for this reason the "flags capturing trick" was invented, I
guess. But to avoid trouble...
Of course we can install the "flags capturing trick" in configure that
RTAI does for 2.4. But this is some code to copy and it seems to be
arch-dependent as well:
[configure.in of RTAI]
...
kmod_cflags=`cd $srcdir/base/config/modules && make -s
RTAI_LINUX_DIR=$RTAI_LINUX_DIR ARCH=$RTAI_TARGET_ARCH CC=$CC | grep
'^RTAI_KMOD_CFLAGS='`
eval $kmod_cflags
if test "$RTAI_KMOD_CFLAGS" = ""; then
AC_MSG_ERROR([Unable to retrieve compilation flags for kernel
modules out of $RTAI_LINUX_DIR/Makefile])
fi
...
case $RTAI_TARGET_ARCH in
...
ppc)
RTAI_TARGET_SUBARCH=
RTAI_KMOD_CFLAGS="$RTAI_KMOD_CFLAGS -I${RTAI_LINUX_DIR}/arch/ppc"
:-/
Hm, the include path is already included. When I do the following I get:
make RTAI_LINUX_DIR=/temp/rtai/devel/linuxppc_2_4_devel ARCH=ppc
make -s -C /temp/rtai/devel/linuxppc_2_4_devel CC=cc
/temp/rtai/devel/linuxppc_2_4_devel/include/linux/modversions.h
make -s -C /temp/rtai/devel/linuxppc_2_4_devel CC=cc ARCH=ppc
SUBDIRS=/opt/eldk/ppc_8xx/root/rtai/kilauea/rtai-core/config/modules
modules
RTAI_KMOD_CFLAGS="-D__KERNEL__
-I/temp/rtai/devel/linuxppc_2_4_devel/include -Wall -Wstrict-prototypes
-Wno-trigraphs -O2 -fno-strict-aliasing -fno-common -fomit-frame-pointer
-I/temp/rtai/devel/linuxppc_2_4_devel/arch/ppc -fsigned-char
-msoft-float -pipe -ffixed-r2 -Wno-uninitialized -mmultiple -mstring -g
-ggdb -DMODULE -DEXPORT_SYMTAB -Wall"
That's good. Ok, then just take over the capturing stuff. Could you do this?
Yes.
Have a nice weekend.
Wolfgang.
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