U-Boot for Videostrong KII Pro (S905)

Videostrong KII Pro is an Android STB manufactured by Videostrong and based on the Amlogic p201 reference board, with the following specification:

  • Amlogic S905 ARM Cortex-A53 quad-core SoC @ 1.5GHz

  • ARM Mali 450 GPU


  • 16GB eMMC

  • Gigabit Ethernet

  • Boardcom BCM4335 WiFi and BT 4.0

  • HDMI 2.0 4K/60Hz display

  • 3x USB 2.0 host

  • 1x USB 2.0 otg

  • microSD

  • Infrared receiver

  • Blue LED

  • Red LED

  • Power button (case, front)

  • Reset button (underside)

  • DVB Card: DVB-S and DVB-T/C

Schematics are not publicly available.

U-Boot Compilation

$ export CROSS_COMPILE=aarch64-none-elf-
$ make videostrong-kii-pro_defconfig
$ make

U-Boot Signing with Pre-Built FIP repo

$ git clone https://github.com/LibreELEC/amlogic-boot-fip --depth=1
$ cd amlogic-boot-fip
$ mkdir my-output-dir
$ ./build-fip.sh wetek-play2 /path/to/u-boot/u-boot.bin my-output-dir

U-Boot Manual Signing

Amlogic does not provide sources for the firmware and tools needed to create a bootloader image and Videostrong has not publicly shared the U-Boot sources needed to build FIP binaries for signing. However you can use the WeTek Play2 binaries from the amlogic-boot-fip repo as the WeTek Play2 and the Videostrong KII Pro share the same RAM chips.

$ git clone https://github.com/LibreELEC/amlogic-boot-fip --depth=1
$ cd amlogic-boot-fip/wetek-play2
$ export FIPDIR=$PWD

Go back to the mainline U-Boot source tree then:

$ mkdir fip
$ cp $FIPDIR/bl2.bin fip/
$ cp $FIPDIR/acs.bin fip/
$ cp $FIPDIR/bl21.bin fip/
$ cp $FIPDIR/bl30.bin fip/
$ cp $FIPDIR/bl301.bin fip/
$ cp $FIPDIR/bl31.img fip/
$ cp u-boot.bin fip/bl33.bin
$ $FIPDIR/blx_fix.sh \
          fip/bl30.bin \
          fip/zero_tmp \
          fip/bl30_zero.bin \
          fip/bl301.bin \
          fip/bl301_zero.bin \
          fip/bl30_new.bin \
$ $FIPDIR/fip_create --bl30 fip/bl30_new.bin \
                     --bl31 fip/bl31.img \
                     --bl33 fip/bl33.bin \
$ sed -i 's/\x73\x02\x08\x91/\x1F\x20\x03\xD5/' fip/bl2.bin
$ python3 $FIPDIR/acs_tool.py fip/bl2.bin fip/bl2_acs.bin fip/acs.bin 0
$ $FIPDIR/blx_fix.sh \
          fip/bl2_acs.bin \
          fip/zero_tmp \
          fip/bl2_zero.bin \
          fip/bl21.bin \
          fip/bl21_zero.bin \
          fip/bl2_new.bin \
$ cat fip/bl2_new.bin fip/fip.bin > fip/boot_new.bin
$ $FIPDIR/aml_encrypt_gxb --bootsig \
                          --input fip/boot_new.bin
                          --output fip/u-boot.bin

Then write U-Boot to SD or eMMC with:

$ DEV=/dev/boot_device
$ dd if=fip/u-boot.bin of=fip/u-boot.bin.gxbb bs=512 conv=fsync
$ dd if=fip/u-boot.bin of=fip/u-boot.bin.gxbb bs=512 seek=9 skip=8 count=87 conv=fsync,notrunc
$ dd if=/dev/zero of=fip/u-boot.bin.gxbb bs=512 seek=8 count=1 conv=fsync,notrunc
$ dd if=bl1.bin.hardkernel of=fip/u-boot.bin.gxbb bs=512 seek=2 skip=2 count=1 conv=fsync,notrunc
$ ./aml_chksum fip/u-boot.bin.gxbb
$ dd if=fip/u-boot.bin.gxbb of=$DEV conv=fsync,notrunc bs=512 skip=1 seek=1
$ dd if=fip/u-boot.bin.gxbb of=$DEV conv=fsync,notrunc bs=1 count=440