Android Customizing the Linux kernel: Difference between revisions

Revision as of 14:28, 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 functionality Exit the menu and answer "Yes" when asked "Do you wish to save your new 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

Edit

VAR-SOM-MX6 : arch/arm/boot/dts/imx6qdl-var-som.dtsi
DART-MX6: arch/arm/boot/dts/imx6qdl-var-dart.dtsi

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

@@ Line 29: / Line 29: @@
 == Flashing the boot image to the target ==
-Boot the device into 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
   $ 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 }}