Compile the Linux Kernel, dtbs, and the modules.

It’s possible to download the Kernel sources from the GitHub repository https://github.com/UDOOboard/linux_kernel.

- It could be prompted to install some packages in order to successfully compile the kernel on Linux.
E.g. in Ubuntu 14.04 it is necessary to install the following packages:

$ sudo apt-get install build-essential ncurses-dev u-boot-tools git gcc-arm-linux-gnueabihf 


- Download the latest kernel revision from GitHub:

$ git clone https://github.com/UDOOboard/linux_kernel


- Move inside the folder linux_kernel, and enter in the A62 branch:

$ cd linux_kernel
$ git checkout imx_3.14.28_1.0.0_ga_a62

- Set the default kernel configuration for UDOO DUAL/QUAD by running the command:

$ make ARCH=arm seco_a62_defconfig


- At this point, it is possible, if you need, to edit the config (optional):

$ make ARCH=arm menuconfig


- Start compiling the Kernel, modules and dtb files:

$ make -j4 CROSS_COMPILE=arm-linux-gnueabihf- ARCH=arm zImage modules dtbs

(This operation could take up to 20 minutes, depending on the PC used) 

- The compiled Kernel binary (zImage) and Device Tree binaries (dtb) will now be available in the arch/arm/boot/ folder, you can copy it in the boot partition.

$ cp arch/arm/boot/zImage /media/<user>/boot
$ cp arch/arm/boot/dts/imx6q-seco_SBC_A62.dtb arch/arm/boot/dts/imx6dl-seco_SBC_A62.dtb /media/<user>/boot/dts/

- Install the modules in the file system root partition (rootfs)

$ make -j4 CROSS_COMPILE=arm-linux-gnueabihf- ARCH=arm modules_install INSTALL_MOD_PATH=/media/<user>/rootfs/