Android Customizing the Linux kernel: Difference between revisions

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== Manual build Android Linux Kernel ==
<!-- Set release according to "release" parameter in URL and use RELEASE_N7.1.1_1.0.0_VAR-SOM-MX6 as default
Change to Android top level directory.
--> {{#vardefine:RELEASE_PARAM|{{#urlget:release}}}} <!--
{{#ifeq: {{#var:ANDROID_NXP_VERSION}} | O8.0.0_1.0.0 |
--> {{#lst:Android_Platform_Customization|{{#var:RELEASE_PARAM|RELEASE_N7.1.1_1.0.0_VAR-SOM-MX6}}}} <!--
$ cd {{#var:BUILD_FOLDER_ANDROID}}
--> {{PageHeader|{{#var:HARDWARE_NAME}} - {{#var:ANDROID_VERSION}} - Customizing the Linux kernel}} {{DocImage|category1=Android|category2={{#var:HARDWARE_NAME}}}} __toc__
|  
$ cd {{#var:BUILD_FOLDER}}/{{#var:BUILD_FOLDER_ANDROID}}
|}}
{{#ifeq: {{#var:ANDROID_NXP_VERSION}} | O8.0.0_1.0.0 |
$ source build/envsetup.sh
$ lunch var_mx6-eng
or
$ lunch var_mx6-userdebug
<span style="color:red">Note: </span> var_mx6-userdebug creates a debuggable version of Android.
var_mx6-eng creates an engineering version of Android. Development mode enable and development tools are available on target.
|
$ source build/envsetup.sh
$ lunch var_mx6-eng
or
$ lunch var_mx6-user
<span style="color:red">Note: </span> var_mx6-user creates a production version of Android.
var_mx6-eng creates an engineering version of Android. Development mode enable and development tools are available on target.
|}}


== Switching from eMMC build to SD card build and vice versa ==
== Making changes to kernel configuration ==
When you switch your target MMC device you need to remove the fstab file. This will guarantee that the make system will copy the right one into target.
$ cd {{#var:BUILD_FOLDER}}/{{#var:BUILD_FOLDER_ANDROID}}/vendor/variscite/kernel_imx/
  $ rm out/target/product/var_mx6/recovery/root/fstab* out/target/product/var_mx6/root/fstab*
$ make ARCH={{#ifeq: {{#var:HARDWARE_NAME}} |VAR-SOM-MX6|arm|arm64}} mrproper
$ 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
Navigate through the menu, and select the desired kernel functionalities, save the new configuration, and exit.<br>
Then, save the new configuration as the default configuration:<br>
$ 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 defconfig arch/{{#ifeq: {{#var:HARDWARE_NAME}} |VAR-SOM-MX6|arm|arm64}}/configs/{{#var:KERNEL_DEFCONFIG}}


== Build Android for SD card ==
== Making changes to the device tree ==
$ make -j4 BUILD_TARGET_DEVICE=sd bootimage 2>&1 | tee build1-1.log
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: {{#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, 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}}}}


*Note: When running Android from an SD card, the eMMC will be detected and presented as an SD card storage.
== Build a new boot.img ==
 
When you perform changes to the kernel, you may build boot.img solely instead of building the whole Android.
== Build Android for on-SOM eMMC ==
$ cd {{#var:BUILD_FOLDER}}/{{#var:BUILD_FOLDER_ANDROID}}
$ make -j4 BUILD_TARGET_DEVICE=emmc bootimage 2>&1 | tee build1-1.log
$ source build/envsetup.sh
 
$ lunch {{#var:ANDROID_MACHINE_NAME}}-userdebug
 
{{#ifeq: {{#var:HARDWARE_NAME}} | VAR-SOM-MX6 |
This will generate image as per table below
$ make bootimage
 
|
{| class="wikitable"
$ make bootimage
|-
$ make dtboimage
! scope="col" | Setup Name<br/>
}}
! scope="col" | Images Names<br/>
! scope="col" | SOM type<br/>
! scope="col" | Carrier Board type<br/>
! scope="col" | LCD Type<br/>
! scope="col" | Evaluation Kit name<br/>
|-
| style="padding: 5px;"| som-mx6qp-c
| style="padding: 5px;"| boot-som-mx6qp-c.img,<br>recovery-som-mx6qp-c.img
| style="padding: 5px;"| VAR-SOM-MX6_V2 (Quad Plus)
| style="padding: 5px;"| VAR-MX6CustomBoard
| style="padding: 5px;"| Capacitive touch
| style="padding: 5px;"| VAR-DVK-MX6_V2-PRO,<br>VAR-STK-MX6_V2
|-
| style="padding: 5px;"| som-mx6qp-r
| style="padding: 5px;"| boot-som-mx6qp-r.img,<br>recovery-som-mx6qp-r.img
| style="padding: 5px;"| VAR-SOM-MX6_V2 (Quad Plus)
| style="padding: 5px;"| VAR-MX6CustomBoard
| style="padding: 5px;"| Resistive touch
| style="padding: 5px;"| VAR-DVK-MX6_V2,<br>VAR-STK-MX6_V2
|-
| style="padding: 5px;"| som-mx6qp-vsc
| style="padding: 5px;"| boot-som-mx6qp-vsc.img,<br>recovery-som-mx6qp-vsc.img
| style="padding: 5px;"| VAR-SOM-MX6_V2 (Quad Plus)
| style="padding: 5px;"| VAR-SOLOCustomBoard
| style="padding: 5px;"| Capacitive LVDS touch
| style="padding: 5px;"| N/A
|-
| style="padding: 5px;"| som-mx6q-c
| style="padding: 5px;"| boot-som-mx6q-c.img,<br>recovery-som-mx6q-c.img
| style="padding: 5px;"| VAR-SOM-MX6_V2 (Quad / Dual)
| style="padding: 5px;"| VAR-MX6CustomBoard
| style="padding: 5px;"| Capacitive touch
| style="padding: 5px;"| VAR-DVK-MX6_V2-PRO,<br>VAR-STK-MX6_V2
|-
| style="padding: 5px;"| som-mx6q-r
| style="padding: 5px;"| boot-som-mx6q-r.img,<br>recovery-som-mx6q-r.img
| style="padding: 5px;"| VAR-SOM-MX6_V2 (Quad / Dual)
| style="padding: 5px;"| VAR-MX6CustomBoard
| style="padding: 5px;"| Resistive touch
| style="padding: 5px;"| VAR-DVK-MX6_V2,<br>VAR-STK-MX6_V2
|-
| style="padding: 5px;"| som-mx6q-vsc
| style="padding: 5px;"| boot-som-mx6q-vsc.img,<br>recovery-som-mx6q-vsc.img
| style="padding: 5px;"| VAR-SOM-MX6_V2 (Quad / Dual)
| style="padding: 5px;"| VAR-SOLOCustomBoard
| style="padding: 5px;"| Capacitive LVDS touch
| style="padding: 5px;"| N/A
|-
| style="padding: 5px;"| som-mx6dl-c
| style="padding: 5px;"| boot-som-mx6dl-c.img,<br>recovery-som-mx6dl-c.img
| style="padding: 5px;"| VAR-SOM-MX6_V2 (DualLite/ Solo)
| style="padding: 5px;"| VAR-MX6CustomBoard
| style="padding: 5px;"| Capacitive touch
| style="padding: 5px;"| N/A
|-
| style="padding: 5px;"| som-mx6dl-r
| style="padding: 5px;"| boot-som-mx6dl-r.img,<br>recovery-som-mx6dl-r.img
| style="padding: 5px;"| VAR-SOM-MX6_V2 (DualLite/ Solo)
| style="padding: 5px;"| VAR-MX6CustomBoard
| style="padding: 5px;"| Resistive touch
| style="padding: 5px;"| N/A
|-
| style="padding: 5px;"| som-solo-vsc
| style="padding: 5px;"| boot-som-solo-vsc.img,<br>recovery-som-solo-vsc.img
| style="padding: 5px;"| VAR-SOM-SOLO / VAR-SOM-DUAL
| style="padding: 5px;"| VAR-SOLOCustomBoard
| style="padding: 5px;"| Capacitive LVDS touch
| style="padding: 5px;"| VAR-DVK-SOLO/DUAL,<br>VAR-STK-SOLO/DUAL
|-
| style="padding: 5px;"| som-solo-c
| style="padding: 5px;"| boot-som-solo-c.img,<br>recovery-som-solo-c.img
| style="padding: 5px;"| VAR-SOM-SOLO / VAR-SOM-DUAL
| style="padding: 5px;"| VAR-MX6CustomBoard
| style="padding: 5px;"| Capacitive touch
| style="padding: 5px;"| N/A
|-
| style="padding: 5px;"| imx6q-var-dart
| style="padding: 5px;"| boot-imx6q-var-dart.img,<br>recovery-imx6q-var-dart.img
| style="padding: 5px;"| DART-MX6
| style="padding: 5px;"| VAR-DT6CustomBoard
| style="padding: 5px;"| Capacitive touch
| style="padding: 5px;"| VAR-STK-DT6,<br>VAR-DVK-DT6
|-
|}


== Flashing the boot image to the target ==
Run the following to boot the device into fastboot mode and reflash the boot image:<br>
$ adb reboot bootloader
$ 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 |


== Flashing bootimage to target ==
Make sure device is in the fastboot mode if not , reboot in fastboot mode by using below commands. <br>
$ adb reboot bootloader
$ fastboot flash boot boot-<setup-name>.img
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 `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.
}}
$ sudo `which 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
Retrieved from "https://variwiki.com/index.php?title=Android_Customizing_the_Linux_kernel&oldid=24418"
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This page was last edited on 12 September 2023, at 21:59.

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