.. SPDX-License-Identifier: GPL-2.0+ U-Boot for Radxa Zero (S905Y2) ============================== Radxa Zero is a small form factor SBC based on the Amlogic S905Y2 chipset that ships in a number of RAM/eMMC configurations: 512MB/1GB LPDDR4 RAM boards have no eMMC and BCM43436 wireless (2.4GHz b/g/n) while the 2GB/4GB boards have 8/16/32/64/128GB eMMC and BCM4345 wireless (2.4/5GHz a/b/g/n/ac). - Amlogic S905Y2 quad-core Cortex-A53 - Mali G31-MP2 GPU - HDMI 2.1 output (micro) - 1x USB 2.0 port - Type C (OTG) - 1x USB 3.0 port - Type C (Host) - 1x micro SD Card slot - 40 Pin GPIO header Schematics are available on the manufacturer website: https://dl.radxa.com/zero/docs/hw U-Boot Compilation ------------------ .. code-block:: bash $ export CROSS_COMPILE=aarch64-none-elf- $ make radxa-zero_defconfig $ make U-Boot Signing with Pre-Built FIP repo -------------------------------------- .. code-block:: bash $ git clone https://github.com/LibreELEC/amlogic-boot-fip --depth=1 $ cd amlogic-boot-fip $ mkdir my-output-dir $ ./build-fip.sh radxa-zero /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 so it is necessary to obtain binaries from sources published by the board vendor: .. code-block:: bash $ git clone -b radxa-zero-v2021.07 https://github.com/radxa/u-boot.git $ git clone https://github.com/radxa/fip.git $ sudo apt-get install -y gcc-aarch64-linux-gnu device-tree-compiler libncurses5 libncurses5-dev $ sudo apt-get install -y bc python dosfstools flex build-essential libssl-dev mtools $ wget https://developer.arm.com/-/media/Files/downloads/gnu-a/10.3-2021.07/binrel/gcc-arm-10.3-2021.07-x86_64-aarch64-none-elf.tar.xz $ sudo tar xvf gcc-arm-10.3-2021.07-x86_64-aarch64-none-elf.tar.xz -C /opt $ export CROSS_COMPILE=/opt/gcc-arm-10.2-2020.11-x86_64-aarch64-none-elf/bin/aarch64-none-elf- $ export ARCH=arm $ cd u-boot $ make radxa-zero_defconfig $ make $ cp u-boot.bin ../fip/radxa-zero/bl33.bin $ cd ../fip/radxa-zero $ make This will generate the signed U-Boot binaries: .. code-block:: bash $ u-boot.bin u-boot.bin.sd.bin u-boot.bin.usb.bl2 u-boot.bin.usb.tpl Then write U-Boot to SD or eMMC with: .. code-block:: bash $ 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