Android Customizing the Linux kernel: Difference between revisions

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--> {{PageHeader|{{#var:HARDWARE_NAME}} - Android {{#var:ANDROID_NAME}} {{#var:ANDROID_VERSION}} Developer Guide}} {{DocImage|category1={{#var:HARDWARE_NAME}}|category2=Android}} __toc__
--> {{PageHeader|{{#var:HARDWARE_NAME}} - {{#var:ANDROID_VERSION}} - Customizing the Linux kernel}} {{DocImage|category1=Android|category2={{#var:HARDWARE_NAME}}}} __toc__
 
== Manual build and customizing Android Linux Kernel ==


== Making changes to kernel configuration ==
== Making changes to kernel configuration ==
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  $ make ARCH={{#ifeq: {{#var:HARDWARE_NAME}} |VAR-SOM-MX6|arm|arm64}} {{#var:KERNEL_DEFCONFIG}}
  $ make ARCH={{#ifeq: {{#var:HARDWARE_NAME}} |VAR-SOM-MX6|arm|arm64}} {{#var:KERNEL_DEFCONFIG}}
  $ make ARCH={{#ifeq: {{#var:HARDWARE_NAME}} |VAR-SOM-MX6|arm|arm64}} menuconfig
  $ make ARCH={{#ifeq: {{#var:HARDWARE_NAME}} |VAR-SOM-MX6|arm|arm64}} menuconfig
Navigate the menu and select the desired kernel functionality
Navigate through the menu, and select the desired kernel functionalities, save the new configuration, and exit.<br>
Exit the menu and answer "Yes" when asked "Do you wish to save your new configuration?"
Then, save the new configuration as the default configuration:<br>
  $ make ARCH={{#ifeq: {{#var:HARDWARE_NAME}} |VAR-SOM-MX6|arm|arm64}} savedefconfig
  $ make ARCH={{#ifeq: {{#var:HARDWARE_NAME}} |VAR-SOM-MX6|arm|arm64}} savedefconfig
  $ cp arch/{{#ifeq: {{#var:HARDWARE_NAME}} |VAR-SOM-MX6|arm|arm64}}/configs/{{#var:KERNEL_DEFCONFIG}} arch/{{#ifeq: {{#var:HARDWARE_NAME}} |VAR-SOM-MX6|arm|arm64}}/configs/{{#var:KERNEL_DEFCONFIG}}.orig  
  $ cp arch/{{#ifeq: {{#var:HARDWARE_NAME}} |VAR-SOM-MX6|arm|arm64}}/configs/{{#var:KERNEL_DEFCONFIG}} arch/{{#ifeq: {{#var:HARDWARE_NAME}} |VAR-SOM-MX6|arm|arm64}}/configs/{{#var:KERNEL_DEFCONFIG}}.orig  
  $ cp defconfig arch/{{#ifeq: {{#var:HARDWARE_NAME}} |VAR-SOM-MX6|arm|arm64}}/configs/
  $ cp defconfig arch/{{#ifeq: {{#var:HARDWARE_NAME}} |VAR-SOM-MX6|arm|arm64}}/configs/{{#var:KERNEL_DEFCONFIG}}


== Making changes to device tree ==
== Making changes to the device tree ==
Edit {{#ifeq: {{#var:HARDWARE_NAME}}|VAR-SOM-MX6| * VAR-SOM-MX6 : arch/arm/boot/dts/imx6qdl-var-som.dtsi <br>
For example, edit the following file: {{#ifeq: {{#var:HARDWARE_NAME}}|VAR-SOM-MX6| * VAR-SOM-MX6 : {{#var:BUILD_FOLDER}}/{{#var:BUILD_FOLDER_ANDROID}}/vendor/variscite/kernel_imx/arch/arm/boot/dts/imx6qdl-var-som.dtsi <br>
*DART-MX6: arch/arm/boot/dts/imx6qdl-var-dart.dtsi| arch/arm64/boot/dts/{{#ifeq: {{#var:HARDWARE_NAME}} | DART-MX8M |freescale/fsl-imx8mq-var-dart-common.dtsi | freescale/fsl-imx8mm-var-dart.dts}}}} <br>
*DART-MX6: {{#var:BUILD_FOLDER}}/{{#var:BUILD_FOLDER_ANDROID}}/vendor/variscite/kernel_imx/arch/arm/boot/dts/imx6qdl-var-dart.dtsi| {{#var:BUILD_FOLDER}}/{{#var:BUILD_FOLDER_ANDROID}}/vendor/variscite/kernel_imx/arch/arm64/boot/dts/{{#ifeq: {{#var:HARDWARE_NAME}} | DART-MX8M |freescale/fsl-imx8mq-var-dart-common.dtsi | freescale/fsl-imx8mm-var-dart.dts}}}} <br>
For example we want to make device tree changes for SPI configuration <br>
For example, if you want to make changes related to the SPI configuration you can refer to: {{#ifeq: {{#var:HARDWARE_NAME}}|VAR-SOM-MX6 |[[{{#var:HARDWARE_NAME}} SPI|SPI]]|{{Varlink|DART-MX8M SPI|{{#var:RELEASE_LINK}}|SPI}}}}
Refer to: {{#ifeq: {{#var:HARDWARE_NAME}}|VAR-SOM-MX6 |[[{{#var:HARDWARE_NAME}} SPI|SPI]]|{{Varlink|DART-MX8M SPI|{{#var:RELEASE_LINK}}|SPI}}}}


== Build New boot.img ==
== Build a new boot.img ==
When you perform changes to the kernel, you may build boot.img solely instead of building the whole Android.
When you perform changes to the kernel, you may build boot.img solely instead of building the whole Android.
  $ cd {{#var:BUILD_FOLDER}}/{{#var:BUILD_FOLDER_ANDROID}}
  $ cd {{#var:BUILD_FOLDER}}/{{#var:BUILD_FOLDER_ANDROID}}
  $ source build/envsetup.sh
  $ source build/envsetup.sh
  $ lunch {{#var:ANDROID_MACHINE_NAME}}-userdebug
  $ lunch {{#var:ANDROID_MACHINE_NAME}}-userdebug
{{#ifeq: {{#var:HARDWARE_NAME}} | VAR-SOM-MX6 |
$ make bootimage
|
  $ make bootimage
  $ make bootimage
$ make dtboimage
}}


== Flashing bootimage to target ==
== Flashing the boot image to the target ==
Make sure device is in the fastboot mode if not , reboot in fastboot mode by using below commands. <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/{{#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 `which fastboot` flash dtbo_a out/target/product/{{#var:ANDROID_MACHINE_NAME}}/dtbo-<name>.img
  $ sudo flash dtbo_a out/target/product/{{#var:ANDROID_MACHINE_NAME}}/dtbo-<name>.img
  $ sudo `which fastboot` flash vbmeta_a out/target/product/{{#var:ANDROID_MACHINE_NAME}}/vbmeta-<name>.img
  $ sudo 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 [[#Images_created_by_the_Android_build_for_Variscite_MX8M_system|"images created" section]].
}}
  }}
  $ sudo `which fastboot` reboot
  $ sudo fastboot reboot
{{#ifeq: {{#var:HARDWARE_NAME}} | VAR-SOM-MX6 ||
*Note: While flashing if you encouter like below <br>
  $ sudo `which fastboot` flash boot_a out/target/product/{{#var:ANDROID_MACHINE_NAME}}/boot.img <br>
target reported max download size of 1073741824 bytes
Sending 'boot_a' (49152 KB)...
OKAY [  1.740s]
Writing 'boot_a'...
FAILED (remote:  device is locked.)
Finished. Total time: 1.772s
Make sure you unlock your device following<br>
{{Varlink|Fastboot Unlock|{{#var:RELEASE_LINK}}|Fastboot Unlock}} and then follow the steps above
}}

Latest revision as of 21:59, 12 September 2023

VAR-SOM-MX6 - 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 through 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/imx_v7_var_android_defconfig

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