Based on Advantech BSP for rk3399 series

• Kernel
  • dmesg: disagrees about version of symbol module_layout requires extraction of Module.symvers:
    • [ 1.335079] kernel: 0x002000000 -- 0x003800000 (24 MB)
      $ adb pull /dev/block/mmcblk1p5 kernel.img
      $ rkunsign kernel.img kernel-rkunsign.img
      
    • [ 0.000000] .text : 0xffffff8008080000 - 0xffffff8008d80000 ( 13312 KB)
      $ extract-symvers.py -B 0xffffff8008080000 -b 64 -k 4.4 kernel-rkunsign.img > Module.symvers
      
  • Build Kernel
    $ mkdir build
    $ cp -p Module.symvers build
    $ cp -p .config build
    $ export ARCH=arm64
    $ export CROSS_COMPILE=rk3399_android_n7/android/prebuilts/gcc/linux-x86/aarch64/gcc-linaro-6.3.1-2017.05-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-
    $ export KSRC=rk3399_android_n7/android/kernel
    $ export O=build
    $ make mrproper
    $ make silentoldconfig prepare headers_install scripts
    for Bluetooth: $ make M=EW-7… modules -j32
    for Wifi: $ make -j32 KBUILD_EXTRA_SYMBOLS=…/Module.symvers
    $ modprobe --dump-modversions build/….ko | grep module_layout
    0x7b41a4c1
    
  • Wi-Fi
    
    • Edimax EW-7822ULC
      • USB IDs:
        0b05:184c
        0bda:b812
        0bda:b82c
        13b1:0043
        7392:b822
        7392:c822
        
      • EW-7822ULC_Linux_Driver_1.0.1.5/rtl88x2BU_WiFi_linux_v5.8.7.4_37264.20200922_COEX20191120-7777/Makefile
        
      • rk3399_rigol:/ # insmod 88x2bu.ko
        
    • Edimax EW-7611ULB
      • V1 (RTL8723BU)
        • USB IDs:
          0bda:b720
          7392:a611
        • EW-7611ULB_Linux_Driver_1.0.1.2/Wi-FI/driver/Makefile
          
        • rk3399_rigol:/ # insmod 8723bu.ko
          
      • V2 or Comfast CF-723B V2 (RTL8723DU)
        • USB IDs:
          0bda:d723
          7392:d611
        • EW-7611ULB_V2_Linux_Driver_1.0.0.0/WIFI/Makefile
          
        • rk3399_rigol:/ # insmod 8723du.ko
          
• AOSP
  • Build Android
    
  • Workarounds for Ubuntu 20.04: crashing flex; stalling jack
  • rk3399_android_n7-90b1b7af.diff
    
  • rk3399_rigol:/ # echo libjni_terminal.so >> /etc/public.libraries.txt
  • rk3399_rigol:/ # am start -a android.intent.action.MAIN -n com.android.launcher3/.Launcher
  • BlueZ Bluetooth with Edimax EW-7611ULB or Comfast CF-723B V2 combo dongle
    
    • USB VIDs:
      0489
      0bda
      1358
      13d3
      7392
      
    • adb root
      adb remount
      
    • rk3399_rigol:/ # cd /
      rk3399_rigol:/ # cp -rp lib/firmware data/local/tmp
      rk3399_rigol:/ # tar xzvf data/local/tmp/ew7611ulb.tgz
      data/local/tmp/firmware/rtl8723b_fw
      data/local/tmp/firmware/rtl8723bu_config
      data/local/tmp/firmware/rtl8723du_config
      data/local/tmp/firmware/rtl8723du_fw
      system/lib/modules/rtk_btusbew7611ulb.ko
      system/lib/modules/rtk_btusbew7611ulbv2.ko
      system/lib/modules/8723bu.ko
      system/lib/modules/8723du.ko
      system/lib/hw/bluetooth.default.so
      system/lib/libbluetooth_jni.so
      system/lib/libbt-vendor.so
      system/xbin/ew7611ulb-v2.sh
      system/xbin/ew7611ulb.sh
    • V1
      • EW-7611ULB_Linux_Driver_1.0.1.2/Bluetooth/bluetooth_usb_driver/: added ew7611ulb suffix to rtk_btusb in Makefile and rtk_bt.c
      • rk3399_rigol:/ # ew7611ulb.sh

    • V2
      • EW-7611ULB_V2_Linux_Driver_1.0.0.0/BT/Linux/usb/bluetooth_usb_driver/: added ew7611ulbv2 suffix to rtk_btusb in Makefile and rtk_bt.c
      • rk3399_rigol:/ # ew7611ulb-v2.sh