Android Customizing the Linux kernel: Difference between revisions

Revision as of 13:14, 31 December 2019

DART-MX8M-MINI - Android Pie Android P9.0.0_r30 - Customizing the Linux kernel

Making changes to kernel configuration

$ cd ~/var_imx-p9.0.0_2.0.0-ga/android_build/vendor/variscite/kernel_imx/
$ make ARCH=arm64 mrproper
$ make ARCH=arm64 imx8_var_android_defconfig
$ make ARCH=arm64 menuconfig

Navigate the menu and select the desired kernel functionality Exit the menu and answer "Yes" when asked "Do you wish to save your new configuration?"

$ make ARCH=arm64 savedefconfig
$ cp arch/arm64/configs/imx8_var_android_defconfig arch/arm64/configs/imx8_var_android_defconfig.orig 
$ cp defconfig arch/arm64/configs/

Making changes to the device tree

Edit arch/arm64/boot/dts/freescale/fsl-imx8mm-var-dart.dts
For example we want to make device tree changes for SPI configuration
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_imx-p9.0.0_2.0.0-ga/android_build
$ source build/envsetup.sh
$ lunch dart_mx8mm-userdebug
$ make bootimage

Flashing the boot image to the target

Boot the device into fastboot mode by using below commands:

$ adb reboot bootloader
$ fastboot flash boot_a out/target/product/out/target/product/dart_mx8mm/boot.img
$ sudo flash dtbo_a out/target/product/dart_mx8mm/dtbo-<name>.img
$ sudo flash vbmeta_a out/target/product/dart_mx8mm/vbmeta-<name>.img

Replace <name> with the actual desired setup name according to the table in the "images created by the Android build" section in the .

$ sudo fastboot reboot

@@ Line 1: / Line 1: @@
 <!-- Set release according to "release" parameter in URL and use RELEASE_N7.1.1_1.0.0_VAR-SOM-MX6 as default
 --> {{#vardefine:RELEASE_PARAM|{{#urlget:release}}}} <!--
---> {{#lst:Android_Platform_Customization|{{#var:RELEASE_PARAM|RELEASE_N7.1.1_1.0.0_VAR-SOM-MX6}}}} <!--
+--> {{#lst:Android_Platform_Customization|{{#var:RELEASE_PARAM|RELEASE_P9.0.0_2.0.0_GA_DART-MX8M-MINI}}}} <!--
 --> {{PageHeader|{{#var:HARDWARE_NAME}} - Android {{#var:ANDROID_NAME}} {{#var:ANDROID_VERSION}} - Customizing the Linux kernel}} {{DocImage|category1={{#var:HARDWARE_NAME}}|category2=Android}} __toc__
-== Manual build and customizing Android Linux Kernel ==
-This section describes how to make changes and flash the new kernel - aka. Android boot image(s) to {{#var:HARDWARE_NAME}}
 == Making changes to kernel configuration ==
@@ Line 18: / Line 15: @@
   $ cp defconfig arch/{{#ifeq: {{#var:HARDWARE_NAME}} |VAR-SOM-MX6|arm|arm64}}/configs/
-== 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>
 *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>
@@ Line 24: / Line 21: @@
 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.
   $ cd {{#var:BUILD_FOLDER}}/{{#var:BUILD_FOLDER_ANDROID}}
@@ Line 31: / Line 28: @@
   $ make bootimage
-== 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>
+Boot the device into fastboot mode by using below commands:<br>
   $ 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 }}
@@ Line 42: / Line 38: @@
   $ sudo 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
-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]].
+Replace <name> with the actual desired setup name according to the table in the [[Android_NXP_Guide#Images_created_by_the_Android_build_for_Variscite_MX8M_system|"images created by the Android build" section]] in the .
 }}
   $ sudo fastboot reboot