Yocto Build Linux: Difference between revisions
From Variscite Wiki
No edit summary |
|||
| Line 53: | Line 53: | ||
<br> | <br> | ||
Install the kernel image and modules: | Install the kernel image and modules: | ||
$ | $ kver=$(strings arch/arm64/boot/Image <nowiki>|</nowiki> grep -i "Linux version" <nowiki>|</nowiki> awk '{print $3}') | ||
$ cp arch/arm64/boot/{{#var:KERNEL_IMAGE}} /media/user/rootfs/boot/$ | $ cp arch/arm64/boot/{{#var:KERNEL_IMAGE}} /media/user/rootfs/boot/{{#var:KERNEL_IMAGE}}-${kver} | ||
$ sudo ln -fs /boot/{{#var:KERNEL_IMAGE}}-${kver} /media/user/rootfs/boot/{{#var:KERNEL_IMAGE}} | |||
$ sudo make ARCH=arm64 modules_install INSTALL_MOD_PATH=/media/user/rootfs | $ sudo make ARCH=arm64 modules_install INSTALL_MOD_PATH=/media/user/rootfs | ||
Revision as of 17:22, 4 September 2018
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 Yocto Toolchain installation.
Build Linux out of Yocto tree
Get the Linux source code:
$ git clone https://github.com/varigit/linux-2.6-imx.git $ cd linux-2.6-imx $ git checkout imx-rel_imx_4.1.15_2.0.0_ga-var02
Build the Linux kernel:
$ source /opt/fslc-x11/2.2.1/environment-setup-armv7at2hf-neon-fslc-linux-gnueabi
$ make mrproper $ make imx6ul-var-dart_defconfig
Customize the kernel configuration (optional step): $ make menuconfig
Build everything: $ make -j4
Build zImage only: $ make -j4 zImage Build modules only: $ make -j4 modules Build device trees only: $ make -j4 dtbs
Build only the device tree for DART-6UL with i.MX6UL SOC, eMMC and WiFi: $ make -j4 imx6ul-var-dart-emmc_wifi.dtb Build only the device tree for DART-6UL with i.MX6UL SOC, eMMC and SD card: $ make -j4 imx6ul-var-dart-sd_emmc.dtb Build only the device tree for DART-6UL with i.MX6UL SOC, NAND flash and WiFi: $ make -j4 imx6ul-var-dart-nand_wifi.dtb Build only the device tree for DART-6UL with i.MX6UL SOC, NAND flash and SD card: $ make -j4 imx6ul-var-dart-sd_nand.dtb Build only the device tree for DART-6UL with i.MX6ULL SOC, eMMC and WiFi: $ make -j4 imx6ull-var-dart-emmc_wifi.dtb Build only the device tree for DART-6UL with i.MX6ULL SOC, eMMC and SD card: $ make -j4 imx6ull-var-dart-sd_emmc.dtb Build only the device tree for DART-6UL with i.MX6ULL SOC, NAND flash and WiFi: $ make -j4 imx6ull-var-dart-nand_wifi.dtb Build only the device tree for DART-6UL with i.MX6ULL SOC, NAND flash and SD card: $ make -j4 imx6ull-var-dart-sd_nand.dtb
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 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-DART-6UL and the rootfs partition is mounted on /media/user/rootfs:
Install the kernel image and modules: $ cp arch/arm/boot/zImage /media/user/BOOT-VAR6UL $ 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-VAR6UL
Note:
If you are using our Yocto 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.