Custom Configuration

Device Tree Overlay Configuration

Technexion implement a device-tree overlay method using AVB 3.0.

Example: runtime stage

Please boot up into u-boot prompt, and issue commands as follows example:

Overlay vl10112880 lvds panel
u-boot=> setenv dtoverlay lvds-vl10112880

Overlay vl215192108 lvds panel
u-boot=> setenv dtoverlay lvds-vl215192108

save your overlay configuration for every boot later, if you just want to boot current setting once, you can ignore this step.
u-boot=> saveenv

boot into Android system
u-boot=> boot

Overlay Table

Example: compile stage

You also can fixed your overlay setting in u-boot header file according your target board such as:

<source>/vendor/nxp-opensource/uboot-imx/include/configs/<your board>_android.h
"dtoverlay=<change to what you want>\0"» \

Change Boot Arguments

According to your device, you might need to change properties let your system performance better, list common properties as follows:

About CMA size, it's up to your DRAM size for each platforms, please modify CMA size as follows table:

Example: runtime stage

EDM-G-IMX8M-PLUS

u-boot=> setenv bootargs stack_depot_disable=on kasan.stacktrace=off console=ttymxc1,115200 earlycon=ec_imx6q,0x30890000,115200 init=/init firmware_class.path=/vendor/firmware loop.max_part=7 transparent_hugepage=never swiotlb=65536 pci=nomsi cma=800M@0x400M-0x1000M bootconfig buildvariant=userdebug loglevel=0
u-boot=> saveenv
u-boot=> boot

Example: compile stage

You also can fixed your overlay setting in u-boot header file according your target board such as:

<source>/vendor/nxp-opensource/uboot-imx/include/configs/<your board>_android.h
"bootargs=<change to what you want>\0"» \

LIBGPIOD JNI demo and APIs

Technexion provide a demo app about libgpiod JNI Test, specific source code as following:

• source code

Users can implement own GUI using our INPUT/OUTPUT APIs

Get total number of GPIO bank:
Java:
public native Int getGpioTotalBank();
Kotlin:
external fun getGpioTotalBank(): Int

Setting GPIO as output with specific value:
Java:
public native String  setGpioInfo(int bank,int line, int value);
Kotlin:
external fun setGpioInfo(bank: Int, line: Int, value: Int): String

Setting GPIO as input and get a value:
Java:
public native String  getGpioInfo(int bank,int line);
Kotlin:
external fun getGpioInfo(bank: Int, line: Int): String

Users also can import JNI library to your own app using Androd Studio, detail instruction as follows:
https://github.com/technexion-android/kotlin_gpiod_demo#kotlin_gpiod_demo

New OTA system: systemupgrade

Our Android 12 does support full update and incremental update, please contact our window to get detail instruction:
sales@technexion.com