doc: boards: amlogic: add documentation for BananaPi CM4IO

Add build instructions for the BananaPi BPI-CM4IO carrier board with
BPI-CM4 module.

Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
Link: https://lore.kernel.org/r/20230320114609.930145-31-christianshewitt@gmail.com
[narmstrong: fixed doc build]
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>

4 files changed, 156 insertions, 1 deletions

diff --git a/board/amlogic/u200/MAINTAINERS b/board/amlogic/u200/MAINTAINERS
index 7535e489d1..47cec234a1 100644
--- a/board/amlogic/u200/MAINTAINERS
+++ b/board/amlogic/u200/MAINTAINERS
@@ -4,7 +4,6 @@ S:	Maintained
 L:	u-boot-amlogic@groups.io
 F:	board/amlogic/u200/
 F:	configs/u200_defconfig
-F:	configs/bananapi-cm4-cm4io_defconfig
 F:	configs/bananapi-m5_defconfig
 F:	configs/radxa-zero_defconfig
 F:	doc/board/amlogic/u200.rst
diff --git a/board/amlogic/w400/MAINTAINERS b/board/amlogic/w400/MAINTAINERS
index 96ccda2001..26a4c2c587 100644
--- a/board/amlogic/w400/MAINTAINERS
+++ b/board/amlogic/w400/MAINTAINERS
@@ -3,4 +3,6 @@ M:	Neil Armstrong <neil.armstrong@linaro.org>
 S:	Maintained
 L:	u-boot-amlogic@groups.io
 F:	board/amlogic/w400/
+F:	configs/bananapi-cm4-cm4io_defconfig
 F:	doc/board/amlogic/w400.rst
+F:	doc/board/amlogic/bananapi-cm4io.rst
diff --git a/doc/board/amlogic/bananapi-cm4io.rst b/doc/board/amlogic/bananapi-cm4io.rst
new file mode 100644
index 0000000000..672cbee7d8
--- /dev/null
+++ b/doc/board/amlogic/bananapi-cm4io.rst
@@ -0,0 +1,153 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+U-Boot for BananaPi CM4 with CM4IO (A311D)
+==========================================
+
+BPI-CM4 is a system-on-module board manufactured by Sinovoip. It follows the Raspberry Pi
+CM4 interface specification but with a single HDMI port and a single DSI output:
+
+ - Amlogic A311D Arm Cortex-A53 dual-core + Cortex-A73 quad-core SoC 
+ - 4GB DDR4 SDRAM
+ - 16GB eMMC
+ - NPU
+ - HDMI 2.1 display
+ - Gigabit Ethernet
+ - RTL8822CS WiFi (a/b/g/n/ac) + BT 5.0
+
+BPI-CM4IO is a carrier board for the BPI-CM4 module with the following specification:
+
+ - CM4 interface
+ - HDMI interface
+ - MIPI CSI interface
+ - MIPI DSI interface
+ - Ethernet interface
+ - PCIe interface
+ - SD (micro)
+ - SIM (micro)
+ - 26-pin GPIO
+ - UART serial
+ - 1x USB-C (power)
+ - 2x USB 2.0
+
+Schematics are available from the manufacturer: https://wiki.banana-pi.org/Banana_Pi_BPI-CM4
+
+U-Boot Compilation
+------------------
+
+.. code-block:: bash
+
+    $ export CROSS_COMPILE=aarch64-none-elf-
+    $ make bananapi-cm4io_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 bananapi-cm4io /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
+
+    $ wget https://releases.linaro.org/archive/13.11/components/toolchain/binaries/gcc-linaro-aarch64-none-elf-4.8-2013.11_linux.tar.xz
+    $ wget https://releases.linaro.org/archive/13.11/components/toolchain/binaries/gcc-linaro-arm-none-eabi-4.8-2013.11_linux.tar.xz
+    $ tar xvfJ gcc-linaro-aarch64-none-elf-4.8-2013.11_linux.tar.xz
+    $ tar xvfJ gcc-linaro-arm-none-eabi-4.8-2013.11_linux.tar.xz
+    $ export PATH=$PWD/gcc-linaro-aarch64-none-elf-4.8-2013.11_linux/bin:$PWD/gcc-linaro-arm-none-eabi-4.8-2013.11_linux/bin:$PATH
+
+    $ DIR=bananapi-cm4io
+    $ git clone --depth 1 https://github.com/Dangku/amlogic-u-boot.git -b khadas-g12b-v2015.01-m2s $DIR
+
+    $ cd $DIR
+    $ make bananapi_cm4_defconfig
+    $ make
+    $ export UBDIR=$PWD
+
+Go back to the mainline U-Boot source tree then:
+
+.. code-block:: bash
+
+    $ mkdir fip
+
+    $ wget https://github.com/BayLibre/u-boot/releases/download/v2017.11-libretech-cc/blx_fix_g12a.sh -O fip/blx_fix.sh
+    $ cp $UBDIR/build/scp_task/bl301.bin fip/
+    $ cp $UBDIR/build/board/bananapi/bananpi_cm4/firmware/acs.bin fip/
+    $ cp $UBDIR/fip/g12a/bl2.bin fip/
+    $ cp $UBDIR/fip/g12a/bl30.bin fip/
+    $ cp $UBDIR/fip/g12a/bl31.img fip/
+    $ cp $UBDIR/fip/g12a/ddr3_1d.fw fip/
+    $ cp $UBDIR/fip/g12a/ddr4_1d.fw fip/
+    $ cp $UBDIR/fip/g12a/ddr4_2d.fw fip/
+    $ cp $UBDIR/fip/g12a/diag_lpddr4.fw fip/
+    $ cp $UBDIR/fip/g12a/lpddr3_1d.fw fip/
+    $ cp $UBDIR/fip/g12a/lpddr4_1d.fw fip/
+    $ cp $UBDIR/fip/g12a/lpddr4_2d.fw fip/
+    $ cp $UBDIR/fip/g12a/piei.fw fip/
+    $ cp $UBDIR/fip/g12a/aml_ddr.fw fip/
+    $ cp u-boot.bin fip/bl33.bin
+
+    $ sh fip/blx_fix.sh \
+         fip/bl30.bin \
+         fip/zero_tmp \
+         fip/bl30_zero.bin \
+         fip/bl301.bin \
+         fip/bl301_zero.bin \
+         fip/bl30_new.bin \
+         bl30
+
+    $ sh fip/blx_fix.sh \
+         fip/bl2.bin \
+         fip/zero_tmp \
+         fip/bl2_zero.bin \
+         fip/acs.bin \
+         fip/bl21_zero.bin \
+         fip/bl2_new.bin \
+         bl2
+
+    $ $UBDIR/fip/g12b/aml_encrypt_g12b --bl30sig --input fip/bl30_new.bin \
+                                       --output fip/bl30_new.bin.g12a.enc \
+                                       --level v3
+    $ $UBDIR/fip/g12b/aml_encrypt_g12b --bl3sig --input fip/bl30_new.bin.g12a.enc \
+                                       --output fip/bl30_new.bin.enc \
+                                       --level v3 --type bl30
+    $ $UBDIR/fip/g12b/aml_encrypt_g12b --bl3sig --input fip/bl31.img \
+                                       --output fip/bl31.img.enc \
+                                       --level v3 --type bl31
+    $ $UBDIR/fip/g12b/aml_encrypt_g12b --bl3sig --input fip/bl33.bin --compress lz4 \
+                                       --output fip/bl33.bin.enc \
+                                       --level v3 --type bl33 --compress lz4
+    $ $UBDIR/fip/g12b/aml_encrypt_g12b --bl2sig --input fip/bl2_new.bin \
+                                       --output fip/bl2.n.bin.sig
+    $ $UBDIR/fip/g12b/aml_encrypt_g12b --bootmk \
+                                       --output fip/u-boot.bin \
+                                       --bl2 fip/bl2.n.bin.sig \
+                                       --bl30 fip/bl30_new.bin.enc \
+                                       --bl31 fip/bl31.img.enc \
+                                       --bl33 fip/bl33.bin.enc \
+                                       --ddrfw1 fip/ddr4_1d.fw \
+                                       --ddrfw2 fip/ddr4_2d.fw \
+                                       --ddrfw3 fip/ddr3_1d.fw \
+                                       --ddrfw4 fip/piei.fw \
+                                       --ddrfw5 fip/lpddr4_1d.fw \
+                                       --ddrfw6 fip/lpddr4_2d.fw \
+                                       --ddrfw7 fip/diag_lpddr4.fw \
+                                       --ddrfw8 fip/aml_ddr.fw \
+                                       --ddrfw9 fip/lpddr3_1d.fw \
+                                       --level v3
+
+Then write the image 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
diff --git a/doc/board/amlogic/index.rst b/doc/board/amlogic/index.rst
index 3eb1cf46e0..e3ed1158df 100644
--- a/doc/board/amlogic/index.rst
+++ b/doc/board/amlogic/index.rst
@@ -85,6 +85,7 @@ Board Documentation
 .. toctree::
    :maxdepth: 1
 
+   bananapi-cm4io
    beelink-gtking
    beelink-gtkingpro
    jethub-j80