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+.. SPDX-License-Identifier: GPL-2.0+
+
+U-Boot for Khadas VIM3L
+=======================
+
+Khadas VIM3L is a single board computer manufactured by Shenzhen Wesion
+Technology Co., Ltd. with the following specifications:
+
+ - Amlogic S905D3 Arm Cortex-A55 quad-core SoC
+ - 2GB LPDDR4 SDRAM
+ - Gigabit Ethernet
+ - HDMI 2.1 display
+ - 40-pin GPIO header
+ - 1 x USB 3.0 Host, 1 x USB 2.0 Host
+ - eMMC, microSD
+ - M.2
+ - Infrared receiver
+
+Schematics are available on the manufacturer website.
+
+PCIe Setup
+----------
+The VIM3 on-board  MCU can mux the PCIe/USB3.0 shared differential
+lines using a FUSB340TMX USB 3.1 SuperSpeed Data Switch between
+an USB3.0 Type A connector and a M.2 Key M slot.
+The PHY driving these differential lines is shared between
+the USB3.0 controller and the PCIe Controller, thus only
+a single controller can use it.
+
+To setup for PCIe, run the following commands from U-Boot:
+
+.. code-block:: none
+
+    i2c dev i2c@5000
+    i2c mw 0x18 0x33 1
+
+Then power-cycle the board.
+
+To set back to USB3.0, run the following commands from U-Boot:
+
+.. code-block:: none
+
+    i2c dev i2c@5000
+    i2c mw 0x18 0x33 0
+
+Then power-cycle the board.
+
+U-Boot compilation
+------------------
+
+.. code-block:: bash
+
+    $ export CROSS_COMPILE=aarch64-none-elf-
+    $ make khadas-vim3l_defconfig
+    $ make
+
+Image creation
+--------------
+
+Amlogic doesn't provide sources for the firmware and for tools needed
+to create the bootloader image, so it is necessary to obtain them from
+the git tree 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=vim3l-u-boot
+    $ git clone --depth 1 \
+       https://github.com/khadas/u-boot.git -b khadas-vims-v2015.01 \
+       $DIR
+
+    $ cd vim3l-u-boot
+    $ make kvim3l_defconfig
+    $ make CROSS_COMPILE=aarch64-none-elf-
+    $ export UBOOTDIR=$PWD
+
+Go back to 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 $UBOOTDIR/build/scp_task/bl301.bin fip/
+    $ cp $UBOOTDIR/build/board/khadas/kvim3l/firmware/acs.bin fip/
+    $ cp $UBOOTDIR/fip/g12a/bl2.bin fip/
+    $ cp $UBOOTDIR/fip/g12a/bl30.bin fip/
+    $ cp $UBOOTDIR/fip/g12a/bl31.img fip/
+    $ cp $UBOOTDIR/fip/g12a/ddr3_1d.fw fip/
+    $ cp $UBOOTDIR/fip/g12a/ddr4_1d.fw fip/
+    $ cp $UBOOTDIR/fip/g12a/ddr4_2d.fw fip/
+    $ cp $UBOOTDIR/fip/g12a/diag_lpddr4.fw fip/
+    $ cp $UBOOTDIR/fip/g12a/lpddr3_1d.fw fip/
+    $ cp $UBOOTDIR/fip/g12a/lpddr4_1d.fw fip/
+    $ cp $UBOOTDIR/fip/g12a/lpddr4_2d.fw fip/
+    $ cp $UBOOTDIR/fip/g12a/piei.fw fip/
+    $ cp $UBOOTDIR/fip/g12a/aml_ddr.fw fip/
+    $ cp u-boot.bin fip/bl33.bin
+
+    $ bash 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
+
+    $ bash 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
+
+    $ $UBOOTDIR/fip/g12a/aml_encrypt_g12a --bl30sig --input fip/bl30_new.bin \
+    					--output fip/bl30_new.bin.g12a.enc \
+    					--level v3
+    $ $UBOOTDIR/fip/g12a/aml_encrypt_g12a --bl3sig --input fip/bl30_new.bin.g12a.enc \
+    					--output fip/bl30_new.bin.enc \
+    					--level v3 --type bl30
+    $ $UBOOTDIR/fip/g12a/aml_encrypt_g12a --bl3sig --input fip/bl31.img \
+    					--output fip/bl31.img.enc \
+    					--level v3 --type bl31
+    $ $UBOOTDIR/fip/g12a/aml_encrypt_g12a --bl3sig --input fip/bl33.bin --compress lz4 \
+    					--output fip/bl33.bin.enc \
+    					--level v3 --type bl33 --compress lz4
+    $ $UBOOTDIR/fip/g12a/aml_encrypt_g12a --bl2sig --input fip/bl2_new.bin \
+    					--output fip/bl2.n.bin.sig
+    $ $UBOOTDIR/fip/g12a/aml_encrypt_g12a --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
+
+and 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