Android Customizing the Linux kernel: Difference between revisions

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Run the following to boot the device into fastboot mode and reflash the boot image:<br>
Run the following to boot the device into fastboot mode and reflash the boot image:<br>
  $ adb reboot bootloader
  $ adb reboot bootloader
  $ fastboot flash boot{{#ifeq: {{#var:HARDWARE_NAME}} | VAR-SOM-MX6 | out/target/product/var_mx6/boot-<setup-name>.img |_a out/target/product/out/target/product/{{#var:ANDROID_MACHINE_NAME}}/boot.img }}
  $ sudo `which fastboot` flash boot{{#ifeq: {{#var:HARDWARE_NAME}} | VAR-SOM-MX6 | out/target/product/var_mx6/boot-<setup-name>.img |_a out/target/product/out/target/product/{{#var:ANDROID_MACHINE_NAME}}/boot.img }}
  {{#ifeq: {{#var:HARDWARE_NAME}} | VAR-SOM-MX6 |
  {{#ifeq: {{#var:HARDWARE_NAME}} | VAR-SOM-MX6 |


Replace setup-name as per above table.
Replace setup-name as per above table.
  |
  |
  $ sudo flash dtbo_a out/target/product/{{#var:ANDROID_MACHINE_NAME}}/dtbo-<name>.img
  $ sudo `which fastboot` flash dtbo_a out/target/product/{{#var:ANDROID_MACHINE_NAME}}/dtbo-<name>.img
  $ sudo flash vbmeta_a out/target/product/{{#var:ANDROID_MACHINE_NAME}}/vbmeta-<name>.img
  $ sudo `which fastboot` flash vbmeta_a out/target/product/{{#var:ANDROID_MACHINE_NAME}}/vbmeta-<name>.img
Replace <name> with the actual desired setup name according to the table in the {{Varlink|Android_NXP_Guide#Images_created_by_the_Android_build|{{#var:RELEASE_LINK}}|"images created by the Android build" section}} in the "Build Android from source code" page.
Replace <name> with the actual desired setup name according to the table in the {{Varlink|Android_NXP_Guide#Images_created_by_the_Android_build|{{#var:RELEASE_LINK}}|"images created by the Android build" section}} in the "Build Android from source code" page.
}}
}}
  $ sudo fastboot reboot
  $ sudo `which fastboot` reboot

Revision as of 14:43, 31 December 2019

VAR-SOM-MX6 - Android Nougat N7.1.1 - Customizing the Linux kernel

Making changes to kernel configuration

$ cd ~/var_n_711_100/n_711_100_build/vendor/variscite/kernel_imx/
$ make ARCH=arm mrproper
$ make ARCH=arm imx_v7_var_android_defconfig
$ make ARCH=arm menuconfig

Navigate the menu and select the desired kernel functionalities, save the new configuration and exit.
Then, save the new configuration as the default configuration:

$ make ARCH=arm savedefconfig
$ cp arch/arm/configs/imx_v7_var_android_defconfig arch/arm/configs/imx_v7_var_android_defconfig.orig 
$ cp defconfig arch/arm/configs/

Making changes to the device tree

For example, edit the following file:

  • VAR-SOM-MX6 : ~/var_n_711_100/n_711_100_build/vendor/variscite/kernel_imx/arch/arm/boot/dts/imx6qdl-var-som.dtsi
  • DART-MX6: ~/var_n_711_100/n_711_100_build/vendor/variscite/kernel_imx/arch/arm/boot/dts/imx6qdl-var-dart.dtsi

For example, if you want to make changes related to the SPI configuration you can refer to: SPI

Build a new boot.img

When you perform changes to the kernel, you may build boot.img solely instead of building the whole Android.

$ cd ~/var_n_711_100/n_711_100_build
$ source build/envsetup.sh
$ lunch -userdebug
$ make bootimage

Flashing the boot image to the target

Run the following to boot the device into fastboot mode and reflash the boot image:

$ adb reboot bootloader
$ sudo `which fastboot` flash bootout/target/product/var_mx6/boot-<setup-name>.img
Replace setup-name as per above table.
$ sudo `which fastboot` reboot