Compiling the Linux kernel
Preparation
Installing the source code management system.
user@ubuntu:~$ sudo apt-get install git-core stgit uboot-mkimage
Create a directory for the Linux source code:
user@ubuntu:~$ mkdir ~/src user@ubuntu:~$ cd ~/src
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:
user@ubuntu:~/src$ git clone https://git.kernel.org/pub/scm/linux/kernel/git/longterm/linux-2.6.34.y.git
Change to directory linux-2.6.34.y
user@ubuntu:~/src$ cd linux-2.6.34.y
Create local branch named v2.6.34.9 with the source code of version 2.6.34.9:
user@ubuntu:~/src/linux-2.6.34.y$ git checkout -b v2.6.34.9 v2.6.34.9
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.
The directory with the patches is on the supplied DVD, and on the TQ product page
user@ubuntu:~$ cd ~/src/BSP/Linux/linux/src user@ubuntu:~/src/BSP/Linux/linux/src$ tar -xvf patches-tqma35_v2.6.34.9.tar
Apply the patches to the downloaded Linux kernel sources:
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
Build kernel
Set variables for cross compilation:
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-
For the current user the environment variables can be stored permanently in the file ~/.bashrc, or system-wide in the file /etc/bash.bashrc.
Configue and build:
user@ubuntu:~/src/linux-2.6.34.y$ make tqma35_defconfig user@ubuntu:~/src/linux-2.6.34.y$ make uImage
Download kernel via TFTP
The kernel image uImage in directory arch/arm/boot has to be copied or linked to the TFTP root directory. Depending on the configuration of the TFTP server it is e.g. /tftpboot. Starting from the kernel source directory copy the uImage to the tftpboot directory with the command:
user@ubuntu:~/src/linux-2.6.34.y$ sudo cp arch/arm/boot/uImage /tftpboot
Or: With the following command a symbolic link in the TFTP root directory can be created:
user@ubuntu:~/src/linux-2.6.34.y$ sudo ln -s ~/src/linux-2.6.34.y/arch/arm/boot/uImage /tftpboot/uImage