[Buildroot] How to compile a kernel with Adeos and Xenomai patches using Buildroot

[Giovanni Balestrieri]

Dear Buildroot mailing list,

I would like to build a Real Time system for the Raspberry Pi board with
the Xenomai and Adeos patches. In this link
https://code.google.com/p/picnc/wiki/RPiXenomaiKernel
patches are applied in the following order:

   1. ipipe-core-3.8.13-raspberry-pre-2.patch
   2. ipipe-core-3.8.13-arm-3.patch
   3. ipipe-core-3.8.13-raspberry-post-2.patch

I've followed the instructions provided in /board/raspberrypi/readme.txt
and I configured Buildroot using the raspberrypi_defconfig. Then I changed
the linux kernel version (BR2_DEFAULT_KERNEL_VERSION) to match the one
compatible with xenomai (3.8.13) and set these options.

BR2_LINUX_KERNEL_EXT_XENOMAI_ADEOS_PATCH: patch_to_adeos_patch

BR2_LINUX_KERNEL_PATCH: path_PRE_patch path_POST_patch

   - With *Buildroot 2013-11, *the compilation ends with 2 errors:

   [...]
   mv autoupdate.tmp autoupdate
   autom4te: need GNU m4 1.4 or later:
   /home/userk/Development/Linux/RaspberryPi/buildroot-2013.11/output/host/usr/bin/m4
   make[3]: *** [autoconf.in] Error 1
   make[3]: Leaving directory
   `/home/userk/Development/Linux/RaspberryPi/buildroot-2013.11/output/build/host-autoconf-2.69/bin'
   make[2]: *** [all-recursive] Error 1
   make[2]: Leaving directory
   `/home/userk/Development/Linux/RaspberryPi/buildroot-2013.11/output/build/host-autoconf-2.69'
   make[1]: *** [all] Error 2
   make[1]: Leaving directory
   `/home/userk/Development/Linux/RaspberryPi/buildroot-2013.11/output/build/host-autoconf-2.69'
   make: ***
   [/home/userk/Development/Linux/RaspberryPi/buildroot-2013.11/output/build/host-autoconf-2.69/.stamp_built]
   Error 2


   - With *Buildroot 2014-11*, the compilation works but the system does
   not
   boot. The boot process stops at

   Starting network...
   usb 1-1 new high-speed USB device number 2 using dwc_otg
   Indeed it is in host mode hprt0 = 00001101


How can I correctly configure Buildroot with Xenomai?

Thank you,
Giovanni Balestrieri.
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