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+.. SPDX-License-Identifier: GPL-2.0+
+
+U-Boot for Radxa Zero2 (A311D)
+==============================
+
+Radxa Zero2 is a small form factor SBC based on the Amlogic A311D chipset with the
+following specification:
+
+- Amlogic A311D (Quad A73 + Dual A53) CPU
+- 4GB LPDDR4 RAM
+- 32/64/128GB eMMC
+- Mali G52-MP4 GPU
+- HDMI 2.1 output (micro)
+- BCM4345 WiFi (2.4/5GHz a/b/g/n/ac) and BT 5.0
+- 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 request from Radxa.
+
+U-Boot Compilation
+------------------
+
+.. code-block:: bash
+
+    $ export CROSS_COMPILE=aarch64-none-elf-
+    $ make radxa-zero2_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-zero2 /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-zero2_defconfig
+    $ make
+
+    $ cp u-boot.bin ../fip/radxa-zero2/bl33.bin
+    $ cd ../fip/radxa-zero2
+    $ 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