Re: [Xenomai] Raspberry Pi + Xenomai doesn't compile

["Marc Marí" <5.markmb.5@gmail.com>]

El Thu, 21 May 2015 23:27:32 +0200
Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org> escribió:
> On Thu, May 21, 2015 at 04:48:56PM -0400, Lennart Sorensen wrote:
> > On Thu, May 21, 2015 at 10:18:11PM +0200, Marc Marí wrote:
> > > Hello
> > > 
> > > I'm trying to put Xenomai 2.6.4 on top of a Raspberry Pi model B
> > > with kernel version 3.8.13. In theory, it should be
> > > straightforward, but I don't get it to compile, and I don't know
> > > if I'm missing something vital or something is broken.
> > > 
> > > This is what I executed:
> > > 
> > > $ git clone git@github.com:raspberrypi/linux.git
> > > $ mv linux rpi-xenomai
> > > $ git checkout rpi-3.8.y
> > > $ patch -p1 -i \
> > > ../xenomai-2.6.4/ksrc/arch/arm/patches/raspberry/ipipe-core-3.8.13-raspberry-pre-2.patch
> > > $ ../xenomai-2.6.4/scripts/prepare-kernel.sh --arch=arm
> > > --linux=./ \
> > > --adeos=../xenomai-2.6.4/ksrc/arch/arm/patches/ipipe-core-3.8.13-arm-4.patch
> > > $ patch -p1 -i
> > > \ ../xenomai-2.6.4/ksrc/arch/arm/patches/raspberry/ipipe-core-3.8.13-raspberry-post-2.patch
> > > $ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf-
> > > bcmrpi_defconfig $ make ARCH=arm
> > > CROSS_COMPILE=arm-linux-gnueabihf-
> > > 
> > > I get this output:
> > > 
> > > kernel/ipipe/core.c: In function ‘ipipe_probe_kernel_read’:
> > > kernel/ipipe/core.c:1748:2: error: implicit declaration of
> > > function ‘get_fs’ [-Werror=implicit-function-declaration]
> > >   mm_segment_t old_fs = get_fs();
> > >   ^
> > > kernel/ipipe/core.c:1750:2: error: implicit declaration of
> > > function ‘set_fs’ [-Werror=implicit-function-declaration]
> > >   set_fs(KERNEL_DS);
> > >   ^
> > > kernel/ipipe/core.c:1750:9: error: ‘KERNEL_DS’ undeclared (first
> > > use in this function)
> > >   set_fs(KERNEL_DS);
> > >          ^
> > > kernel/ipipe/core.c:1750:9: note: each undeclared identifier is
> > > reported only once for each function it appears in
> > > kernel/ipipe/core.c:1753:2: error: implicit declaration of
> > > function
> > > ‘__copy_from_user_inatomic’ [-Werror=implicit-function-declaration]
> > > ret = __copy_from_user_inatomic(dst, ^
> > > kernel/ipipe/core.c: In function ‘ipipe_probe_kernel_write’:
> > > kernel/ipipe/core.c:1767:9: error: ‘KERNEL_DS’ undeclared (first
> > > use in this function)
> > >   set_fs(KERNEL_DS);
> > >          ^
> > > kernel/ipipe/core.c:1770:2: error: implicit declaration of
> > > function
> > > ‘__copy_to_user_inatomic’ [-Werror=implicit-function-declaration]
> > > ret = __copy_to_user_inatomic((__force void __user *)dst, src,
> > > size); ^ cc1: some warnings being treated as errors
> > > scripts/Makefile.build:307: recipe for target
> > > 'kernel/ipipe/core.o' failed
> > > make[2]: *** [kernel/ipipe/core.o] Error 1
> > > scripts/Makefile.build:454: recipe for target 'kernel/ipipe'
> > > failed make[1]: *** [kernel/ipipe] Error 2
> > > Makefile:791: recipe for target 'kernel' failed
> > > make: *** [kernel] Error 2
> > > 
> > > 
> > > I tried by including asm/uaccess.h, which solved the issue. But
> > > the kernel doesn't boot, and there is no message. It just hangs.
> > > 
> > > I tried the same kernel without Xenomai patch, and it compiles and
> > > boots without problem.
> > 
> > Did you enable IPIPE in the config?  After all bcmrpi_defconfig
> > probably does NOT include IPIPE config, and most releases of ipipe
> > don't compile if you disable IPIPE support.  I have only ever seen
> > recent versions actually be able to compile with CONFIG_IPIPE=n.
> 
> That statement is simply not true. Most I-pipe patched kernel
> compile with IPIPE off, but you happened to find one that did not.
> Please stop spreading this misconception.
> 

Thanks. I had to disable a few config options, including the DWC OTG
driver in order to boot. It now works.

Thanks
Marc