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Improve documentation. Signed-off-by: Christian Hewitt <christianshewitt@gmail.com> Link: https://lore.kernel.org/r/20230320114609.930145-24-christianshewitt@gmail.com [narmstrong: fixed doc build] Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
81 lines
2.5 KiB
ReStructuredText
81 lines
2.5 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0+
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U-Boot for Radxa Zero (S905Y2)
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==============================
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Radxa Zero is a small form factor SBC based on the Amlogic S905Y2 chipset that ships in
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a number of RAM/eMMC configurations:
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512MB/1GB LPDDR4 RAM boards have no eMMC and BCM43436 wireless (2.4GHz b/g/n) while the
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2GB/4GB boards have 8/16/32/64/128GB eMMC and BCM4345 wireless (2.4/5GHz a/b/g/n/ac).
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- Amlogic S905Y2 quad-core Cortex-A53
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- Mali G31-MP2 GPU
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- HDMI 2.1 output (micro)
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- 1x USB 2.0 port - Type C (OTG)
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- 1x USB 3.0 port - Type C (Host)
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- 1x micro SD Card slot
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- 40 Pin GPIO header
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Schematics are available on the manufacturer website: https://dl.radxa.com/zero/docs/hw
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U-Boot Compilation
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------------------
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.. code-block:: bash
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$ export CROSS_COMPILE=aarch64-none-elf-
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$ make radxa-zero_defconfig
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$ make
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U-Boot Signing with Pre-Built FIP repo
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--------------------------------------
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.. code-block:: bash
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$ git clone https://github.com/LibreELEC/amlogic-boot-fip --depth=1
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$ cd amlogic-boot-fip
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$ mkdir my-output-dir
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$ ./build-fip.sh radxa-zero /path/to/u-boot/u-boot.bin my-output-dir
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U-Boot Manual Signing
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---------------------
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Amlogic does not provide sources for the firmware and tools needed to create a bootloader
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image so it is necessary to obtain binaries from sources published by the board vendor:
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.. code-block:: bash
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$ git clone -b radxa-zero-v2021.07 https://github.com/radxa/u-boot.git
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$ git clone https://github.com/radxa/fip.git
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$ sudo apt-get install -y gcc-aarch64-linux-gnu device-tree-compiler libncurses5 libncurses5-dev
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$ sudo apt-get install -y bc python dosfstools flex build-essential libssl-dev mtools
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$ 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
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$ sudo tar xvf gcc-arm-10.3-2021.07-x86_64-aarch64-none-elf.tar.xz -C /opt
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$ export CROSS_COMPILE=/opt/gcc-arm-10.2-2020.11-x86_64-aarch64-none-elf/bin/aarch64-none-elf-
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$ export ARCH=arm
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$ cd u-boot
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$ make radxa-zero_defconfig
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$ make
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$ cp u-boot.bin ../fip/radxa-zero/bl33.bin
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$ cd ../fip/radxa-zero
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$ make
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This will generate the signed U-Boot binaries:
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.. code-block:: bash
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$ u-boot.bin u-boot.bin.sd.bin u-boot.bin.usb.bl2 u-boot.bin.usb.tpl
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Then write U-Boot to SD or eMMC with:
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.. code-block:: bash
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$ DEV=/dev/boot_device
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$ dd if=fip/u-boot.bin.sd.bin of=$DEV conv=fsync,notrunc bs=512 skip=1 seek=1
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$ dd if=fip/u-boot.bin.sd.bin of=$DEV conv=fsync,notrunc bs=1 count=440
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