[PATCH 4/4] doc: boards: amlogic: update for Radxa Zero

[Christian Hewitt]

Add documentation bits for the Radxa Zero

Signed-off-by: Christian Hewitt <christianshewitt at gmail.com>
---
 doc/board/amlogic/index.rst      |  3 +-
 doc/board/amlogic/radxa-zero.rst | 74 ++++++++++++++++++++++++++++++++
 2 files changed, 76 insertions(+), 1 deletion(-)
 create mode 100644 doc/board/amlogic/radxa-zero.rst

diff --git a/doc/board/amlogic/index.rst b/doc/board/amlogic/index.rst
index 2913ab281a..e2ab600f7f 100644
--- a/doc/board/amlogic/index.rst
+++ b/doc/board/amlogic/index.rst
@@ -17,7 +17,7 @@ This matrix concerns the actual source code version.
 +===============================+===========+=================+==============+============+============+=============+==============+
 | Boards                       	| Odroid-C2 | P212            | Khadas VIM2  | S400       | U200       | Odroid-N2   | SEI610       |
 |        			| Nanopi-K2 | Khadas-VIM      | Libretech-PC |	          | SEI510     | Khadas-VIM3 | Khadas-VIM3L |
-|        			| P200	    | LibreTech-CC v1 |	WeTek Core2  |	          |            | GT-King/Pro | Odroid-C4    |
+|        			| P200	    | LibreTech-CC v1 |	WeTek Core2  |	          | Radxa Zero | GT-King/Pro | Odroid-C4    |
 |        			| P201	    | LibreTech-AC v2 |	             |	          |            | GSKing-X    | Odroid-HC4   |
 |                               |           |                 |              |            |            |             | BananaPi-M5  |
 +-------------------------------+-----------+-----------------+--------------+------------+------------+-------------+--------------+
@@ -96,6 +96,7 @@ Board Documentation
    p201
    p212
    q200
+   radxa-zero
    s400
    sei510
    sei610
diff --git a/doc/board/amlogic/radxa-zero.rst b/doc/board/amlogic/radxa-zero.rst
new file mode 100644
index 0000000000..423403f3c7
--- /dev/null
+++ b/doc/board/amlogic/radxa-zero.rst
@@ -0,0 +1,74 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+U-Boot for Radxa Zero
+=====================
+
+Radxa Zero is a small form factor SBC based on the Amlogic S905Y2
+chipset that ships in a number of RAM/eMMC configurations:
+
+Boards with 512MB/1GB LPDDR4 RAM have no eMMC storage and BCM43436
+wireless (2.4GHz b/g/n) while 2GB/4GB boards have 8/16/32/64/128GB
+eMMC storage 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/RADAX_ZERO_V13_SCH_20210309.pdf
+
+U-Boot compilation
+------------------
+
+.. code-block:: bash
+
+    $ export CROSS_COMPILE=aarch64-none-elf-
+    $ make radxa-zero_defconfig
+    $ make
+
+Image creation
+--------------
+
+Amlogic does not provide sources for the firmware and for tools needed
+to create the bootloader image, so it is necessary to obtain them from
+git trees 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:
+
+.. code-block:: bash
+
+    $ u-boot.bin u-boot.bin.sd.bin u-boot.bin.usb.bl2 u-boot.bin.usb.tpl
+
+Then write the image to SD with:
+
+.. code-block:: bash
+
+    $ DEV=/dev/your_sd_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=444
-- 
2.17.1