Linux_Kernel.adoc

Linux Kernel

Obtaining a Linux Kernel image

$ git clone https://github.com/Freescale/linux-fslc.git
$ cd linux-fslc
$ git checkout -b <name_your_branch> origin/4.1-1.0.x-imx

Use the commands below to compile:

$ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- mrproper
$ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- imx_v7_defconfig
$ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- zImage
$ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- modules
$ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- imx7s-warp.dtb

Updating a Linux Kernel image

Power up your WaRP7, U-boot prompt will come (use any serial console i.e. minicom).

Run the following command on u-boot:

=> ums 0 mmc 0

You will be able to see emmc as storage device on your computer.

Use any standard utility to make partition table. (i.e. gparted)

Create 2 partitions, a 100MB FAT32 partition and define the remaing space as an ext4 partition.

Copy zImage to the fat32 partition.

Copy imx7s-warp.dtb to the fat32 partition.

Install kernel modules to the rootfs as shown below:

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

Note: If you don’t have a rootfs on your WaRP7 partition, you can obtain one by following the steps on Chapter 6 The Yocto Project

Unmount the partitions using

sudo umount /dev/sd<X>

In u-boot prompt, hit Ctrl+C, to cancel the mounted mmc.

Reboot your board, linux must be up and running.