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U-Boot for Beelink GS-King-X (S922X)

The Shenzen AZW (Beelink) GS-King-X is based on the Amlogic W400 reference board with an S922X-H chip and the following specifications:

  • 4GB LPDDR4 RAM
  • 64GB eMMC storage
  • 10/100/1000 Base-T Ethernet
  • AP6356S Wireless (802.11 a/b/g/n/ac, BT 4.1)
  • HDMI 2.1 video
  • S/PDIF optical output
  • 2x ESS9018 audio DACs
  • 4x Ricor RT6862 audio amps
  • Analogue headphone output
  • 1x USB 2.0 OTG port
  • 3x USB 3.0 ports
  • IR receiver
  • 1x micro SD card slot (internal)
  • USB SATA controller with 2x 3.5" drive bays
  • 1x Power on/off button

Beelink do not provide public schematics, but have been willing to share them with known distro developers to assist with development.

U-Boot Compilation

$ export CROSS_COMPILE=aarch64-none-elf-
$ make beelink-gsking-x_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 beelink-s922x /path/to/u-boot/u-boot.bin my-output-dir

U-Boot Manual Signing

Beelink released an Amlogic "SDK" dump in their forums but the U-Boot sources included result in 2GB RAM detected. The following FIPs were generated with newer sources and detect 4GB RAM: https://github.com/LibreELEC/amlogic-boot-fip/tree/master/beelink-s922x

$ wget https://github.com/LibreELEC/amlogic-boot-fip/archive/master.zip
$ unzip master.zip
$ export FIPDIR=$PWD/amlogic-boot-fip/beelink-s922x

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

$ mkdir fip
$ cp $FIPDIR/* fip/
$ cp u-boot.bin fip/bl33.bin

$ sh fip/blx_fix.sh \
     fip/bl30.bin \
     fip/zero_tmp \
     fip/bl30_zero.bin \
     fip/bl301.bin \
     fip/bl301_zero.bin \
     fip/bl30_new.bin \
     bl30

$ sh fip/blx_fix.sh \
     fip/bl2.bin \
     fip/zero_tmp \
     fip/bl2_zero.bin \
     fip/acs.bin \
     fip/bl21_zero.bin \
     fip/bl2_new.bin \
     bl2

$ fip/aml_encrypt_g12b --bl30sig --input fip/bl30_new.bin \
                       --output fip/bl30_new.bin.g12a.enc \
                       --level v3
$ fip/aml_encrypt_g12b --bl3sig --input fip/bl30_new.bin.g12a.enc \
                       --output fip/bl30_new.bin.enc \
                       --level v3 --type bl30
$ fip/aml_encrypt_g12b --bl3sig --input fip/bl31.img \
                       --output fip/bl31.img.enc \
                       --level v3 --type bl31
$ fip/aml_encrypt_g12b --bl3sig --input fip/bl33.bin --compress lz4 \
                       --output fip/bl33.bin.enc \
                       --level v3 --type bl33
$ fip/aml_encrypt_g12b --bl2sig --input fip/bl2_new.bin \
                       --output fip/bl2.n.bin.sig
$ fip/aml_encrypt_g12b --bootmk \
                       --output fip/u-boot.bin \
                       --bl2 fip/bl2.n.bin.sig \
                       --bl30 fip/bl30_new.bin.enc \
                       --bl31 fip/bl31.img.enc \
                       --bl33 fip/bl33.bin.enc \
                       --ddrfw1 fip/ddr4_1d.fw \
                       --ddrfw2 fip/ddr4_2d.fw \
                       --ddrfw3 fip/ddr3_1d.fw \
                       --ddrfw4 fip/piei.fw \
                       --ddrfw5 fip/lpddr4_1d.fw \
                       --ddrfw6 fip/lpddr4_2d.fw \
                       --ddrfw7 fip/diag_lpddr4.fw \
                       --ddrfw8 fip/aml_ddr.fw \
                       --level v3

Then write U-Boot to SD or eMMC with:

$ DEV=/dev/boot_device
$ dd if=fip/u-boot.bin.sd.bin of=$DEV conv=fsync,notrunc bs=512 skip=1 seek=1
$ dd if=fip/u-boot.bin.sd.bin of=$DEV conv=fsync,notrunc bs=1 count=440