Cross compiling linux-gpib for Raspbian

Folks,
Now that Frank has made the jump to separate the package into kernel
and user parts - cross compilation has become a lot easier. Here is a
procedure that I tested out recently.

Prerequisites
-------------

You have downloaded the raspbian tools and kernel and compiled the
kernel sources as per the instructions in
https://www.raspberrypi.org/documentation/linux/kernel/building.md

In the following it is assumed that:

   1. the linux-gpib-kernel sources are in   ~/gpib/linux-gpib-kernel-4.2.0
   2. the linux-gpib-user sources are in     ~/gpib/linux-gpib-user-4.2.0
   3. the raspbian toolchain is installed in ~/tools
   4. the raspbian kernel source tree is  in ~/raspbian-linux
   5. the ext4 partition of the raspberry pi sd-card is mounted on /mnt/ext4


Modify the procedure below accordingly if your setup is different.

Procedure
---------

1: Set your PATH for the Makfiles to find the build tools

export
> PATH=$PATH:~/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin


2: Set the environment variables for cross compilation

export CROSS_COMPILE=arm-linux-gnueabihf-
> export ARCH=arm
> export CC=arm-linux-gnueabihf-gcc


3: Build and install the kernel modules

cd ~/gpib/linux-gpib-kernel-4.2.0
> ./configure --prefix=/mnt/ext4 --with-linux-srcdir=$HOME/raspbian-linux/
> --host=arm
> make
> sudo -E make INSTALL_MOD_PATH=/mnt/ext4 install


4: Build and install the user space package

cd ~/gpib/linux-gpib-user-4.2.0
> ./configure --prefix=/mnt/ext4/usr/local --sysconfdir=/etc --host=arm
> make
> sudo -E make install


At this point you can unmount the sd-card partition(s), install the card
in your pi system and test out the gpib installation.

Notes
-----

Cross compilation for the perl binding is broken as its Makefile is
still not made with the standard autotools.

If you are uncomfortable with the sudo -E option you can include the
shell variable assignments in each of the sudo make commands instead:

sudo make INSTALL_MOD_PATH=/mnt/ext4 install
> CROSS_COMPILE=arm-linux-gnueabihf- ARCH=arm CC=arm-linux-gnueabihf-gcc


cheers,
-Dave

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