VAR-SOM-MX6 Yocto Krogoth Build Linux out of tree

VAR-SOM-MX6 - Yocto Krogoth Linux out of tree

It is recommended to build the kernel image using Yocto (see the Customizing the Linux kernel and U-Boot page) instead of using the direct method described in this page.
This is because some of the Yocto packages depend on the kernel, like the WiFi module that is built from outside of the kernel source tree.

Toolchain installation for out of Yocto builds

To install the toolchain, follow VAR-SOM-MX6 Toolchain installation for out of Yocto Krogoth builds.

Build Linux out of Yocto tree

Get the Linux source code:

$ git clone https://github.com/varigit/linux-2.6-imx.git -b imx-rel_imx_4.1.15_2.0.0_ga-var01

Build the Linux kernel:

$ source /opt/fsl-imx-x11/4.1.15-2.0.1/environment-setup-cortexa9hf-neon-poky-linux-gnueabi

$ cd linux-2.6-imx/
$ make mrproper
$ make imx_v7_var_defconfig

Build uImage and modules:
$ make -j4 LOADADDR=0x10008000 uImage
$ make -j4 LOADADDR=0x10008000 modules

Build all device trees:
$ make -j4 dtbs

or
Build device tree for a specific device:

Build the device tree for Dualite/Solo on VAR-MX6CustomBoard with capacitive touchscreen:
$ make -j4 imx6dl-var-som-cap.dtb

Build the device tree for Dualite/Solo on VAR-MX6CustomBoard with resistive touchscreen:
$ make -j4 imx6dl-var-som-res.dtb

Build the device tree for Dualite/Solo on VAR-SOLOCustomBoard:
$ make -j4 imx6dl-var-som-vsc.dtb

Build the device tree for Quad/Dual on VAR-MX6CustomBoard with capacitive touchscreen:
$ make -j4 imx6q-var-som-cap.dtb

Build the device tree for Quad/Dual on VAR-MX6CustomBoard with resistive touchscreen:
$ make -j4 imx6q-var-som-res.dtb

Build the device tree for Quad/Dual on VAR-SOLOCustomBoard:
$ make -j4 imx6q-var-som-vsc.dtb

Build the device tree for VAR-SOM-SOLO on VAR-MX6CustomBoard with capacitive touchscreen:
$ make -j4 imx6dl-var-som-solo-cap.dtb

Build the device tree for VAR-SOM-SOLO on VAR-MX6CustomBoard with resistive touchscreen:
$ make -j4 imx6dl-var-som-solo-res.dtb

Build the device tree for VAR-SOM-SOLO on VAR-SOLOCustomBoard:
$ make -j4 imx6dl-var-som-solo-vsc.dtb

Build the device tree for DART-MX6:
$ make -j4 imx6q-var-dart.dtb

Notes:

If you replace the kernel image (uImage) on your system, you also need to reinstall the kernel modules, and vice versa.

If you just want to make a change in the device tree, you can compile and replace it without replacing the kernel image and modules.

Install the built kernel on an SD card

Copy the uImage and device trees to the SD card boot partition, and install the modules in the SD card rootfs partition.
Assuming the boot partition is mounted on /media/user/BOOT-VARMX6 and the rootfs partition is mounted on /media/user/rootfs:

Install the kernel image and modules:
$ cp arch/arm/boot/uImage /media/user/BOOT-VARMX6/
$ sudo make ARCH=arm modules_install INSTALL_MOD_PATH=/media/user/rootfs/

Install the device trees:
$ cp arch/arm/boot/dts/*var*.dtb /media/user/BOOT-VARMX6/

Note:
If you are using our recovery SD card, and you want the NAND flash/eMMC installation to update as well as the SD card boot itself, you need to also update the /opt/images/Yocto directory.