====== Compiling the Linux kernel ======
===== Preparation =====
Installing the source code management system.
<code bash>
user@ubuntu:~$ sudo apt-get install git-core stgit uboot-mkimage
</code>

Create a directory for the Linux source code:
<code bash>
user@ubuntu:~$ mkdir ~/src
user@ubuntu:~$ cd ~/src
</code>

==== Fetch source code ====
Download archive with patch files and get the corresponding version of the Linux kernel. In this case the patches for version v2.6.34.9 from branch 2.6.34.y.

Download the source code using git:
<code bash>
user@ubuntu:~/src$ git clone https://git.kernel.org/pub/scm/linux/kernel/git/longterm/linux-2.6.34.y.git
</code>

Change to directory ''linux-2.6.34.y''
<code bash>
user@ubuntu:~/src$ cd linux-2.6.34.y
</code>

Create local branch named v2.6.34.9 with the source code of version 2.6.34.9:
<code bash>
user@ubuntu:~/src/linux-2.6.34.y$ git checkout -b v2.6.34.9 v2.6.34.9
</code>

The source code of Linux kernel version 2.6.34.9 is now in directory ''/home/user/src/linux-2.6.34.y''.

==== Patch sources ====
Copy the archive with the patches to a local directory, e.g. to ''~/src/BSP/Linux/linux/src''. Extract the archive there using tar.

<WRAP round info>
The directory with the patches is on the supplied DVD, and on the [[http://www.tq-group.com/tqma35#product-downloads|TQ product page]]
</WRAP>

<code bash>
user@ubuntu:~$ cd ~/src/BSP/Linux/linux/src
user@ubuntu:~/src/BSP/Linux/linux/src$ tar -xvf patches-tqma35_v2.6.34.9.tar
</code>

Apply the patches to the downloaded Linux kernel sources:

<code bash>
user@ubuntu:~/src/linux-2.6.34.y$ stg init
user@ubuntu:~/src/linux-2.6.34.y$ stg import -t -s ~/src/BSP/Linux/linux/src/patches-tqma35_v2.6.34.9/series
</code>
===== Build kernel =====
Set variables for cross compilation:
<code bash>
user@ubuntu:~/src/linux-2.6.34.y$ export ARCH=arm
user@ubuntu:~/src/linux-2.6.34.y$ export CROSS_COMPILE=/opt/freescale/usr/local/gcc-4.4.4-glibc-2.11.1-multilib-1.0/arm-fsl-linux-gnueabi/bin/arm-none-linux-gnueabi-
</code>
<WRAP round tip>
For the current user the environment variables can be stored permanently in the file ''~/.bashrc'', or system-wide in the file ''/etc/bash.bashrc''.
</WRAP>

Configue and build:
<code bash>
user@ubuntu:~/src/linux-2.6.34.y$ make tqma35_defconfig
user@ubuntu:~/src/linux-2.6.34.y$ make uImage
</code>

==== Download kernel via TFTP ====
The kernel image ''uImage'' in directory arch/arm/boot has to be copied or linked to the [[:tftp|TFTP]] root directory. Depending on the configuration of the [[:tftp|TFTP]] server it is e.g. ''/tftpboot''. Starting from the kernel source directory copy the ''uImage'' to the ''tftpboot'' directory with the command:
<code bash>
user@ubuntu:~/src/linux-2.6.34.y$ sudo cp arch/arm/boot/uImage /tftpboot
</code>

**Or:**
With the following command a symbolic link in the TFTP root directory can be created:
<code bash>
user@ubuntu:~/src/linux-2.6.34.y$ sudo ln -s  ~/src/linux-2.6.34.y/arch/arm/boot/uImage /tftpboot/uImage
</code>