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? Thanks, Jan
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