U-Boot for Beelink GT-King Pro (S922X)
The Shenzen AZW (Beelink) GT-King Pro 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
Analogue audio output
1x RS232 port
2x USB 2.0 port
2x USB 3.0 ports
IR receiver
1x SD card slot
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-gtkingpro_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