U-Boot for Khadas VIM3

Khadas VIM3 is a single board computer manufactured by Shenzhen Wesion Technology Co., Ltd. with the following specifications:

  • Amlogic A311D Arm Cortex-A53 dual-core + Cortex-A73 quad-core SoC

  • 4GB 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:

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:

i2c dev i2c@5000
i2c mw 0x18 0x33 0

Then power-cycle the board.

U-Boot compilation

$ export CROSS_COMPILE=aarch64-none-elf-
$ make khadas-vim3_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:

$ 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=vim3-u-boot
$ git clone --depth 1 \
   https://github.com/khadas/u-boot.git -b khadas-vims-v2015.01 \
   $DIR

$ cd vim3-u-boot
$ make kvim3_defconfig
$ make CROSS_COMPILE=aarch64-none-elf-
$ export UBOOTDIR=$PWD

Go back to mainline U-Boot source tree then :

$ 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/kvim3/firmware/acs.bin fip/
$ cp $UBOOTDIR/fip/g12b/bl2.bin fip/
$ cp $UBOOTDIR/fip/g12b/bl30.bin fip/
$ cp $UBOOTDIR/fip/g12b/bl31.img fip/
$ cp $UBOOTDIR/fip/g12b/ddr3_1d.fw fip/
$ cp $UBOOTDIR/fip/g12b/ddr4_1d.fw fip/
$ cp $UBOOTDIR/fip/g12b/ddr4_2d.fw fip/
$ cp $UBOOTDIR/fip/g12b/diag_lpddr4.fw fip/
$ cp $UBOOTDIR/fip/g12b/lpddr3_1d.fw fip/
$ cp $UBOOTDIR/fip/g12b/lpddr4_1d.fw fip/
$ cp $UBOOTDIR/fip/g12b/lpddr4_2d.fw fip/
$ cp $UBOOTDIR/fip/g12b/piei.fw fip/
$ cp $UBOOTDIR/fip/g12b/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/g12b/aml_encrypt_g12b --bl30sig --input fip/bl30_new.bin \
                                    --output fip/bl30_new.bin.g12a.enc \
                                    --level v3
$ $UBOOTDIR/fip/g12b/aml_encrypt_g12b --bl3sig --input fip/bl30_new.bin.g12a.enc \
                                    --output fip/bl30_new.bin.enc \
                                    --level v3 --type bl30
$ $UBOOTDIR/fip/g12b/aml_encrypt_g12b --bl3sig --input fip/bl31.img \
                                    --output fip/bl31.img.enc \
                                    --level v3 --type bl31
$ $UBOOTDIR/fip/g12b/aml_encrypt_g12b --bl3sig --input fip/bl33.bin --compress lz4 \
                                    --output fip/bl33.bin.enc \
                                    --level v3 --type bl33 --compress lz4
$ $UBOOTDIR/fip/g12b/aml_encrypt_g12b --bl2sig --input fip/bl2_new.bin \
                                    --output fip/bl2.n.bin.sig
$ $UBOOTDIR/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

and then write the image to SD with:

$ 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