Yocto Build Linux
From Variscite Wiki
Build Linux from source code
It is recommended to build the kernel image using Yocto (see the Customizing the Linux kernel page) instead of using the direct method described in this page.
This is because some of the Yocto packages may depend on the kernel, like the WiFi module that is built from outside of the kernel source tree on some of the Yocto releases.
This is because some of the Yocto packages may depend on the kernel, like the WiFi module that is built from outside of the kernel source tree on some of the Yocto releases.
Toolchain installation for out of Yocto builds
To install the toolchain, follow the Yocto Toolchain installation guide.
Setup the environment:
Setup a working directory
$ export WORKDIR=~/imx6ul-var-dart-linux
$ mkdir ${WORKDIR}
Build Linux out of Yocto tree
Fetch linux-imx source code:
$ cd $WORKDIR $ git clone https://github.com/varigit/linux-imx.git -b 5.4-2.1.x-imx_var01 linux-imx $ cd linux-imx && \ git checkout 5.4-2.1.x-imx_var01 && \ cd ../
Build Kernel, Modules, and DTBs:
Setup the environment:
$ source /opt/fslc-x11/3.1/environment-setup-cortexa7t2hf-neon-fslc-linux-gnueabi
Clean and prepare the kernel:
$ cd ${WORKDIR}/linux-imx
$ make mrproper
$ make imx_v7_var_defconfig
Customize the kernel configuration (optional step): $ make menuconfig
Build kernel parts:
Build everything: $ make -j$(nproc) Build zImage only: $ make -j$(nproc) zImage Build modules only: $ make -j$(nproc) modules Build device trees only: $ make -j$(nproc) dtbs
Build only the device tree for DART-6UL with i.MX6ULL SOC, eMMC and SD card: $ make -j4 imx6ull-var-dart-6ulcustomboard-emmc-sd-card.dtb Build only the device tree for DART-6UL with i.MX6ULL SOC, eMMC, WM8731 and SD card: $ make -j4 imx6ull-var-dart-6ulcustomboard-emmc-sd-card-wm8731.dtb Build only the device tree for DART-6UL with i.MX6ULL SOC, eMMC and WiFi: $ make -j4 imx6ull-var-dart-6ulcustomboard-emmc-wifi.dtb Build only the device tree for DART-6UL with i.MX6ULL SOC, eMMC, WM8731 and WiFi: $ make -j4 imx6ull-var-dart-6ulcustomboard-emmc-wifi-wm8731.dtb Build only the device tree for DART-6UL with i.MX6ULL SOC, NAND flash and SD card: $ make -j4 imx6ull-var-dart-6ulcustomboard-nand-sd-card.dtb Build only the device tree for DART-6UL with i.MX6ULL SOC, NAND flash, WM8731 and SD card: $ make -j4 imx6ull-var-dart-6ulcustomboard-nand-sd-card-wm8731.dtb Build only the device tree for DART-6UL with i.MX6ULL SOC, NAND flash and WiFi: $ make -j4 imx6ull-var-dart-6ulcustomboard-nand-wifi.dtb Build only the device tree for DART-6UL with i.MX6ULL SOC, NAND flash, WM8731 and WiFi: $ make -j4 imx6ull-var-dart-6ulcustomboard-nand-wifi-wm8731.dtb Build only the device tree for DART-6UL with i.MX6UL SOC, eMMC and SD card: $ make -j4 imx6ul-var-dart-6ulcustomboard-emmc-sd-card.dtb Build only the device tree for DART-6UL with i.MX6UL SOC, eMMC, WM8731 and SD card: $ make -j4 imx6ul-var-dart-6ulcustomboard-emmc-sd-card-wm8731.dtb Build only the device tree for DART-6UL with i.MX6UL SOC, eMMC and WiFi: $ make -j4 imx6ul-var-dart-6ulcustomboard-emmc-wifi.dtb Build only the device tree for DART-6UL with i.MX6UL SOC, eMMC, WM8731 and WiFi: $ make -j4 imx6ul-var-dart-6ulcustomboard-emmc-wifi-wm8731.dtb Build only the device tree for DART-6UL with i.MX6UL SOC, NAND flash and SD card: $ make -j4 imx6ul-var-dart-6ulcustomboard-nand-sd-card.dtb Build only the device tree for DART-6UL with i.MX6UL SOC, NAND flash, WM8731 and SD card: $ make -j4 imx6ul-var-dart-6ulcustomboard-nand-sd-card-wm8731.dtb Build only the device tree for DART-6UL with i.MX6UL SOC, NAND flash and WiFi: $ make -j4 imx6ul-var-dart-6ulcustomboard-nand-wifi.dtb Build only the device tree for DART-6UL with i.MX6UL SOC, NAND flash, WM8731 and WiFi: $ make -j4 imx6ul-var-dart-6ulcustomboard-nand-wifi-wm8731.dtb Build only the device tree for DART-6UL with i.MX6ULZ SOC, eMMC and SD card: $ make -j4 imx6ulz-var-dart-6ulcustomboard-emmc-sd-card.dtb Build only the device tree for DART-6UL with i.MX6ULZ SOC, eMMC, WM8731 and SD card: $ make -j4 imx6ulz-var-dart-6ulcustomboard-emmc-sd-card-wm8731.dtb Build only the device tree for DART-6UL with i.MX6ULZ SOC, eMMC and WiFi: $ make -j4 imx6ulz-var-dart-6ulcustomboard-emmc-wifi.dtb Build only the device tree for DART-6UL with i.MX6ULZ SOC, eMMC, WM8731 and WiFi: $ make -j4 imx6ulz-var-dart-6ulcustomboard-emmc-wifi-wm8731.dtb Build only the device tree for DART-6UL with i.MX6ULZ SOC, NAND flash and SD card: $ make -j4 imx6ulz-var-dart-6ulcustomboard-nand-sd-card.dtb Build only the device tree for DART-6UL with i.MX6ULZ SOC, NAND flash, WM8731 and SD card: $ make -j4 imx6ulz-var-dart-6ulcustomboard-nand-sd-card-wm8731.dtb Build only the device tree for DART-6UL with i.MX6ULZ SOC, NAND flash and WiFi: $ make -j4 imx6ulz-var-dart-6ulcustomboard-nand-wifi.dtb Build only the device tree for DART-6UL with i.MX6ULZ SOC, NAND flash, WM8731 and WiFi: $ make -j4 imx6ulz-var-dart-6ulcustomboard-nand-wifi-wm8731.dtb Build only the device tree for VAR-SOM-6UL on Concerto board with i.MX6ULL SOC, eMMC and SD card: $ make -j4 imx6ull-var-som-concerto-board-emmc-sd-card.dtb Build only the device tree for VAR-SOM-6UL on Concerto board with i.MX6ULL SOC, eMMC, WM8731 and SD card: $ make -j4 imx6ull-var-som-concerto-board-emmc-sd-card-wm8731.dtb Build only the device tree for VAR-SOM-6UL on Concerto board with i.MX6ULL SOC, eMMC and WiFi: $ make -j4 imx6ull-var-som-concerto-board-emmc-wifi.dtb Build only the device tree for VAR-SOM-6UL on Concerto board with i.MX6ULL SOC, eMMC, WM8731 and WiFi: $ make -j4 imx6ull-var-som-concerto-board-emmc-wifi-wm8731.dtb Build only the device tree for VAR-SOM-6UL on Concerto board with i.MX6ULL SOC, NAND flash and SD card: $ make -j4 imx6ull-var-som-concerto-board-nand-sd-card.dtb Build only the device tree for VAR-SOM-6UL on Concerto board with i.MX6ULL SOC, NAND flash, WM8731 and SD card: $ make -j4 imx6ull-var-som-concerto-board-nand-sd-card-wm8731.dtb Build only the device tree for VAR-SOM-6UL on Concerto board with i.MX6ULL SOC, NAND flash and WiFi: $ make -j4 imx6ull-var-som-concerto-board-nand-wifi.dtb Build only the device tree for VAR-SOM-6UL on Concerto board with i.MX6ULL SOC, NAND flash, WM8731 and WiFi: $ make -j4 imx6ull-var-som-concerto-board-nand-wifi-wm8731.dtb Build only the device tree for VAR-SOM-6UL on Concerto board with i.MX6UL SOC, eMMC and SD card: $ make -j4 imx6ul-var-som-concerto-board-emmc-sd-card.dtb Build only the device tree for VAR-SOM-6UL on Concerto board with i.MX6UL SOC, eMMC, WM8731 and SD card: $ make -j4 imx6ul-var-som-concerto-board-emmc-sd-card-wm8731.dtb Build only the device tree for VAR-SOM-6UL on Concerto board with i.MX6UL SOC, eMMC and WiFi: $ make -j4 imx6ul-var-som-concerto-board-emmc-wifi.dtb Build only the device tree for VAR-SOM-6UL on Concerto board with i.MX6UL SOC, eMMC, WM8731 and WiFi: $ make -j4 imx6ul-var-som-concerto-board-emmc-wifi-wm8731.dtb Build only the device tree for VAR-SOM-6UL on Concerto board with i.MX6UL SOC, NAND flash and SD card: $ make -j4 imx6ul-var-som-concerto-board-nand-sd-card.dtb Build only the device tree for VAR-SOM-6UL on Concerto board with i.MX6UL SOC, NAND flash, WM8731 and SD card: $ make -j4 imx6ul-var-som-concerto-board-nand-sd-card-wm8731.dtb Build only the device tree for VAR-SOM-6UL on Concerto board with i.MX6UL SOC, NAND flash and WiFi: $ make -j4 imx6ul-var-som-concerto-board-nand-wifi.dtb Build only the device tree for VAR-SOM-6UL on Concerto board with i.MX6UL SOC, NAND flash, WM8731 and WiFi: $ make -j4 imx6ul-var-som-concerto-board-nand-wifi-wm8731.dtb Build only the device tree for VAR-SOM-6UL on Concerto board with i.MX6ULZ SOC, eMMC and SD card: $ make -j4 imx6ulz-var-som-concerto-board-emmc-sd-card.dtb Build only the device tree for VAR-SOM-6UL on Concerto board with i.MX6ULZ SOC, eMMC, WM8731 and SD card: $ make -j4 imx6ulz-var-som-concerto-board-emmc-sd-card-wm8731.dtb Build only the device tree for VAR-SOM-6UL on Concerto board with i.MX6ULZ SOC, eMMC and WiFi: $ make -j4 imx6ulz-var-som-concerto-board-emmc-wifi.dtb Build only the device tree for VAR-SOM-6UL on Concerto board with i.MX6ULZ SOC, eMMC, WM8731 and WiFi: $ make -j4 imx6ulz-var-som-concerto-board-emmc-wifi-wm8731.dtb Build only the device tree for VAR-SOM-6UL on Concerto board with i.MX6ULZ SOC, NAND flash and SD card: $ make -j4 imx6ulz-var-som-concerto-board-nand-sd-card.dtb Build only the device tree for VAR-SOM-6UL on Concerto board with i.MX6ULZ SOC, NAND flash, WM8731 and SD card: $ make -j4 imx6ulz-var-som-concerto-board-nand-sd-card-wm8731.dtb Build only the device tree for VAR-SOM-6UL on Concerto board with i.MX6ULZ SOC, NAND flash and WiFi: $ make -j4 imx6ulz-var-som-concerto-board-nand-wifi.dtb Build only the device tree for VAR-SOM-6UL on Concerto board with i.MX6ULZ SOC, NAND flash, WM8731 and WiFi: $ make -j4 imx6ulz-var-som-concerto-board-nand-wifi-wm8731.dtb Build only the device tree for VAR-SOM-6UL on Symphony board with i.MX6ULL SOC, eMMC and SD card: $ make -j4 imx6ull-var-som-symphony-board-emmc-sd-card.dtb Build only the device tree for VAR-SOM-6UL on Symphony board with i.MX6ULL SOC, eMMC, WM8731 and SD card: $ make -j4 imx6ull-var-som-symphony-board-emmc-sd-card-wm8731.dtb Build only the device tree for VAR-SOM-6UL on Symphony board with i.MX6ULL SOC, eMMC and WiFi: $ make -j4 imx6ull-var-som-symphony-board-emmc-wifi.dtb Build only the device tree for VAR-SOM-6UL on Symphony board with i.MX6ULL SOC, eMMC, WM8731 and WiFi: $ make -j4 imx6ull-var-som-symphony-board-emmc-wifi-wm8731.dtb Build only the device tree for VAR-SOM-6UL on Symphony board with i.MX6ULL SOC, NAND flash and SD card: $ make -j4 imx6ull-var-som-symphony-board-nand-sd-card.dtb Build only the device tree for VAR-SOM-6UL on Symphony board with i.MX6ULL SOC, NAND flash, WM8731 and SD card: $ make -j4 imx6ull-var-som-symphony-board-nand-sd-card-wm8731.dtb Build only the device tree for VAR-SOM-6UL on Symphony board with i.MX6ULL SOC, NAND flash and WiFi: $ make -j4 imx6ull-var-som-symphony-board-nand-wifi.dtb Build only the device tree for VAR-SOM-6UL on Symphony board with i.MX6ULL SOC, NAND flash, WM8731 and WiFi: $ make -j4 imx6ull-var-som-symphony-board-nand-wifi-wm8731.dtb Build only the device tree for VAR-SOM-6UL on Symphony board with i.MX6UL SOC, eMMC and SD card: $ make -j4 imx6ul-var-som-symphony-board-emmc-sd-card.dtb Build only the device tree for VAR-SOM-6UL on Symphony board with i.MX6UL SOC, eMMC, WM8731 and SD card: $ make -j4 imx6ul-var-som-symphony-board-emmc-sd-card-wm8731.dtb Build only the device tree for VAR-SOM-6UL on Symphony board with i.MX6UL SOC, eMMC and WiFi: $ make -j4 imx6ul-var-som-symphony-board-emmc-wifi.dtb Build only the device tree for VAR-SOM-6UL on Symphony board with i.MX6UL SOC, eMMC, WM8731 and WiFi: $ make -j4 imx6ul-var-som-symphony-board-emmc-wifi-wm8731.dtb Build only the device tree for VAR-SOM-6UL on Symphony board with i.MX6UL SOC, NAND flash and SD card: $ make -j4 imx6ul-var-som-symphony-board-nand-sd-card.dtb Build only the device tree for VAR-SOM-6UL on Symphony board with i.MX6UL SOC, NAND flash, WM8731 and SD card: $ make -j4 imx6ul-var-som-symphony-board-nand-sd-card-wm8731.dtb Build only the device tree for VAR-SOM-6UL on Symphony board with i.MX6UL SOC, NAND flash and WiFi: $ make -j4 imx6ul-var-som-symphony-board-nand-wifi.dtb Build only the device tree for VAR-SOM-6UL on Symphony board with i.MX6UL SOC, NAND flash, WM8731 and WiFi: $ make -j4 imx6ul-var-som-symphony-board-nand-wifi-wm8731.dtb Build only the device tree for VAR-SOM-6UL on Symphony board with i.MX6ULZ SOC, eMMC and SD card: $ make -j4 imx6ulz-var-som-symphony-board-emmc-sd-card.dtb Build only the device tree for VAR-SOM-6UL on Symphony board with i.MX6ULZ SOC, eMMC, WM8731 and SD card: $ make -j4 imx6ulz-var-som-symphony-board-emmc-sd-card-wm8731.dtb Build only the device tree for VAR-SOM-6UL on Symphony board with i.MX6ULZ SOC, eMMC and WiFi: $ make -j4 imx6ulz-var-som-symphony-board-emmc-wifi.dtb Build only the device tree for VAR-SOM-6UL on Symphony board with i.MX6ULZ SOC, eMMC, WM8731 and WiFi: $ make -j4 imx6ulz-var-som-symphony-board-emmc-wifi-wm8731.dtb Build only the device tree for VAR-SOM-6UL on Symphony board with i.MX6ULZ SOC, NAND flash and SD card: $ make -j4 imx6ulz-var-som-symphony-board-nand-sd-card.dtb Build only the device tree for VAR-SOM-6UL on Symphony board with i.MX6ULZ SOC, NAND flash, WM8731 and SD card: $ make -j4 imx6ulz-var-som-symphony-board-nand-sd-card-wm8731.dtb Build only the device tree for VAR-SOM-6UL on Symphony board with i.MX6ULZ SOC, NAND flash and WiFi: $ make -j4 imx6ulz-var-som-symphony-board-nand-wifi.dtb Build only the device tree for VAR-SOM-6UL on Symphony board with i.MX6ULZ SOC, NAND flash, WM8731 and WiFi: $ make -j4 imx6ulz-var-som-symphony-board-nand-wifi-wm8731.dtb
Install kernel modules to temporary directory
Create a temporary directory to install the modules:
Optional: delete any old installation from previous builds: $ rm -rf $WORKDIR/rootfs Create new directory: $ mkdir -p $WORKDIR/rootfs
Install the modules to the temporary rootfs:
$ cd ${WORKDIR}/linux-imx && \
make ARCH=arm \
INSTALL_MOD_STRIP=1 \
INSTALL_MOD_PATH=$WORKDIR/rootfs \
modules_install
Notes:
If you replace the kernel image (zImage) 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 images, modules, and device trees on an SD card
Copy the zImage 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-VAR6UL and the rootfs partition is mounted on /media/user/root:
Install the kernel image and modules:
$ cd ${WORKDIR}/linux-imx
$ cp arch/arm/boot/zImage /media/user/BOOT-VAR6UL
$ sudo cp $WORKDIR/rootfs/* /media/user/rootfs
Install the device trees:
$ sudo cp arch/arm/boot/dts/imx6ul*var*.dtb /media/user/BOOT-VAR6UL
Notes:
- If you are using our Yocto Recovery SD card, and you want the NAND flash/eMMC installation process to be updated as well as the SD card boot itself, you need to also update the /opt/images/Yocto directory.
- You should always properly unmount your SD card before physically removing it.