On Tuesday 2. February 2016 14.44.34 Nourhan Mohamed wrote:
I wanted to build a simple character device module for L4Linux on ARM device. However, I don't know who should I compile it for the L4Linux version (version 4.3.0). Can you please help me with what files should I download to cross compile the module and what should be included in the Makefile? My machine is a 64-bit machine running Ubuntu with Linux kernel version 4.3.3.
I know that others will be able to offer far more assistance than I can, but is the problem related to cross-compiling in general or the specific task of cross-compiling the module?
On the more general topic, I've been using Debian to cross-compile L4Re and Fiasco.OC, and it's been possible to use the cross-toolchains in the unstable version of Debian. I guess the following packages are relevant for ARM:
https://packages.debian.org/sid/gcc-arm-linux-gnueabi https://packages.debian.org/sid/gcc-arm-linux-gnueabihf
I've been using the following package for MIPS:
https://packages.debian.org/sid/gcc-mipsel-linux-gnu
I believe that Ubuntu has raced ahead with some aspects of providing cross- toolchains for ARM, and I found these:
http://packages.ubuntu.com/xenial/gcc-arm-linux-gnueabi http://packages.ubuntu.com/xenial/gcc-arm-linux-gnueabihf
On a slightly less general topic, I've followed these instructions for the most part to get L4Re and Fiasco.OC cross-compiled:
https://github.com/MIPS/fiasco-l4re/blob/master/HOWTO.fiasco-l4re#L75
The SYSTEM_TARGET setting seems to be pertinent here.
I also found that I needed to do this (for MIPS):
ln -s /usr/share/pkg-config-crosswrapper /usr/bin/mipsel-linux-gnu-pkg-config
But I did read once that Ubuntu's packages set up various symbolic links for ARM (ignoring the need to do this generically for many architectures).
And I also found that I needed to change src/l4/mk/Makeconf so that the correct pkg-config would be used:
PKG_CONFIG = $(SYSTEM_TARGET)pkg-config
I hope this isn't telling you things you already know, and I can't help you with your specific topic of Linux module compilation, unfortunately.
Paul