Custom Configuration

Device Tree Overlay Configuration

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

Overlay Table

Example

Runtime stage

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

• Overlay vl10112880 lvds panel

  • EDM-G-IMX8M-PLUS

    u-boot=> setenv dtoverlay lvds-vl10112880
    

  • EDM-G-IMX8M-MINI

    u-boot=> setenv dtoverlay sn65dsi84-vl10112880
    

• Overlay vl215192108 lvds panel

  • EDM-G-IMX8M-PLUS

    u-boot=> setenv dtoverlay lvds-vl215192108
    

  • EDM-G-IMX8M-MINI

    u-boot=> setenv dtoverlay sn65dsi84-vl215192108
    

• Overlay tevi-ov5640

  • Setup dt overlay

    u-boot=> setenv dtoverlay tevi-ov5640
    

• Overlay tevi-ap1302

  • Setup dt overlay

    u-boot=> setenv dtoverlay tevi-ap1302
    

  • NOTE!
    For TEVI-AR serials camera, in addition to dt overlay, also need to set the camera configuration
    Such as TEVI-AR0144
    • Set camera configuration by each camera module
      add androidboot.camera.layout=ar0144 to bootargs

      u-boot=> env edit bootargs
      edit: 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 buildvariant=userdebug androidboot.hwrotation=0 androidboot.usb.debugging=1 bootconfig androidboot.camera.layout=ar0144
      

    • Camera module and configuration mapping table

      Camera Module	Camera Configuration
      TEVI-AR0144	ar0144
      TEVI-AR0234	ar0234
      TEVI-AR0521	ar0521
      TEVI-AR0522	ar0522
      TEVI-AR0821	ar0821
      TEVI-AR0822	ar0822
      TEVI-AR1335	ar1335

• 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
  

Compile stage

You also can fixed your overlay setting in u-boot header file according your target board
For example, to enable TEVI-AR0144 of EDM-G-IMX8M-PLUS, add overlay and camera configuration to vendor/nxp-opensource/uboot-imx/include/configs/edm-g-imx8mp_android.h

#define CONFIG_EXTRA_ENV_SETTINGS	\
    ......
	"dtoverlay=tevi-ap1302\0"\
	"bootargs="\
    ......
	"androidboot.camera.layout=ar0144 "\
	"bootconfig "\
	"\0"

• Note the setting in bootargs without '\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

Compile stage

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


For example, set the default properties of EDM-G-IMX8M-PLUS

#define CONFIG_EXTRA_ENV_SETTINGS	\
    ......
	"bootargs="\
    ......
	"cma=800M@0x400M-0x1000M "\
    ......
	"\0"

LIBGPIOD JNI demo and APIs

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

• 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 here