[Xenomai] Cross-compiling for ARM

[Xenomai] Cross-compiling for ARM

[John Morris]

My Debian kernel packages are just updated to Xenomai 2.6.3 and Linux 
3.8.13 (will ask for testing soon), and I'm starting to look at adding 
armhf packages using Robert C Nelson's and Charles Steinkuehler's patch 
sets.  However, I'm brand-new at cross-compiling and would appreciate a 
pointer.

Right out of the box, pbuilder can build in a QEMU-emulated chroot by 
setting --arch=armhf and --debootstrap=qemu-debootstrap.  Super easy. 
Super slow.

Is there a way to cross-compile in an x86 native environment so that the 
(x86 native) compiler/assembler/linker/etc. cross-build for ARM 
architecture?

	John

Re: [Xenomai] Cross-compiling for ARM

[Gilles Chanteperdrix]

On 05/18/2014 10:36 PM, John Morris wrote:
> My Debian kernel packages are just updated to Xenomai 2.6.3 and Linux 
> 3.8.13 (will ask for testing soon), and I'm starting to look at adding 
> armhf packages using Robert C Nelson's and Charles Steinkuehler's patch 
> sets.  However, I'm brand-new at cross-compiling and would appreciate a 
> pointer.
> 
> Right out of the box, pbuilder can build in a QEMU-emulated chroot by 
> setting --arch=armhf and --debootstrap=qemu-debootstrap.  Super easy. 
> Super slow.
> 
> Is there a way to cross-compile in an x86 native environment so that the 
> (x86 native) compiler/assembler/linker/etc. cross-build for ARM 
> architecture?

You need to install a cross compilation toolchain. You can find 
pre-built ones, for instance for armhf, you can use the linaro 
toolchain. Cross-compilation toolchain programs names begin with a 
string identifying the target architecture. For instance, linaro 
toolchain compiler is arm-linux-gnueabihf-gcc. In order to cross-
compile a kernel for this architecture, you whould use

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf-

For the user-space part you need to pass the prefix without the final 
dash to configure's --host option. As in:
./configure --host=arm-linux-gnueabihf

The installation procedure is described in README.INSTALL, see for
instance:
http://www.xenomai.org/documentation/xenomai-2.6/html/README.INSTALL/#arm


-- 
                                                                Gilles.

Re: [Xenomai] Cross-compiling for ARM

[Charles Steinkuehler]

On 5/18/2014 4:04 PM, Gilles Chanteperdrix wrote:
> On 05/18/2014 10:36 PM, John Morris wrote:
>> My Debian kernel packages are just updated to Xenomai 2.6.3 and Linux 
>> 3.8.13 (will ask for testing soon), and I'm starting to look at adding 
>> armhf packages using Robert C Nelson's and Charles Steinkuehler's patch 
>> sets.  However, I'm brand-new at cross-compiling and would appreciate a 
>> pointer.
>>
>> Right out of the box, pbuilder can build in a QEMU-emulated chroot by 
>> setting --arch=armhf and --debootstrap=qemu-debootstrap.  Super easy. 
>> Super slow.
>>
>> Is there a way to cross-compile in an x86 native environment so that the 
>> (x86 native) compiler/assembler/linker/etc. cross-build for ARM 
>> architecture?
> 
> You need to install a cross compilation toolchain. You can find 
> pre-built ones, for instance for armhf, you can use the linaro 
> toolchain.

The RCN kernel build scripts (so my scripts as well) will download a
known working linaro cross-compiler if you run on an x86 machine and
don't point the build scripts to a pre-installed tool chain.

Review the scripts/gcc.sh shell script if you need hints on getting the
cross-compiler up and running, but it's pretty straight-forward.

-- 
Charles Steinkuehler
charles@steinkuehler.net

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