U-Boot for Libre Computer AML-S905D3-CC ‘Solitude’ (S905D3)

AML-S905D3-CC is a Single Board Computer manufactured by Libre Computer Technology with the following specifications:

  • Amlogic S905D3 Cortex-A55 quad-core SoC

  • 2 or 4GB LPDDR4 SDRAM

  • Gigabit Ethernet

  • HDMI 2.1 display

  • 40-pin GPIO header

  • 4 x USB 3.0 Host, 1 x USB 2.0 Type-C

  • eMMC 5.x SM Interface for Libre Computer Modules

  • microSD

  • Infrared receiver

Schematics are available on the manufacturer website.

U-Boot Compilation

$ export CROSS_COMPILE=aarch64-none-elf-
$ make aml-s905d3-cc_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 aml-s905d3-cc /path/to/u-boot/u-boot.bin my-output-dir

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