1.. SPDX-License-Identifier: GPL-2.0+
2
3U-Boot for Khadas VIM2 (S912)
4=============================
5
6Khadas VIM2 is a Single Board Computer manufactured by Shenzhen Wesion Technology Co. Ltd
7with the following specifications:
8
9 - Amlogic S912 ARM Cortex-A53 octo-core SoC @ 1.5GHz
10 - ARM Mali T860 GPU
11 - 2GB/3GB DDR4 SDRAM
12 - 16GB/32GB/64GB eMMC
13 - 10/100/1000 Ethernet
14 - HDMI 2.0 4K/60Hz display
15 - 40-pin GPIO header
16 - 2 x USB 2.0 Host, 1 x USB 2.0 Type-C OTG
17 - 2MB SPI Flash
18 - microSD
19 - SDIO Wifi Module, Bluetooth
20 - Two channels IR receiver
21
22U-Boot Compilation
23------------------
24
25.. code-block:: bash
26
27    $ export CROSS_COMPILE=aarch64-none-elf-
28    $ make khadas-vim2_defconfig
29    $ make
30
31U-Boot Signing with Pre-Built FIP repo
32--------------------------------------
33
34.. code-block:: bash
35
36    $ git clone https://github.com/LibreELEC/amlogic-boot-fip --depth=1
37    $ cd amlogic-boot-fip
38    $ mkdir my-output-dir
39    $ ./build-fip.sh khadas-vim2 /path/to/u-boot/u-boot.bin my-output-dir
40
41U-Boot Manual Signing
42---------------------
43
44Amlogic does not provide sources for the firmware and tools needed to create a bootloader
45image so it is necessary to obtain binaries from sources published by the board vendor:
46
47.. code-block:: bash
48
49    $ wget https://releases.linaro.org/archive/13.11/components/toolchain/binaries/gcc-linaro-aarch64-none-elf-4.8-2013.11_linux.tar.xz
50    $ wget https://releases.linaro.org/archive/13.11/components/toolchain/binaries/gcc-linaro-arm-none-eabi-4.8-2013.11_linux.tar.xz
51    $ tar xvfJ gcc-linaro-aarch64-none-elf-4.8-2013.11_linux.tar.xz
52    $ tar xvfJ gcc-linaro-arm-none-eabi-4.8-2013.11_linux.tar.xz
53    $ 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
54    $ git clone https://github.com/khadas/u-boot -b khadas-vim-v2015.01 vim-u-boot
55    $ cd vim-u-boot
56    $ make kvim2_defconfig
57    $ make
58    $ export FIPDIR=$PWD/fip
59
60Go back to the mainline U-Boot source tree then:
61
62.. code-block:: bash
63
64    $ mkdir fip
65
66    $ cp $FIPDIR/gxl/bl2.bin fip/
67    $ cp $FIPDIR/gxl/acs.bin fip/
68    $ cp $FIPDIR/gxl/bl21.bin fip/
69    $ cp $FIPDIR/gxl/bl30.bin fip/
70    $ cp $FIPDIR/gxl/bl301.bin fip/
71    $ cp $FIPDIR/gxl/bl31.img fip/
72    $ cp u-boot.bin fip/bl33.bin
73
74    $ $FIPDIR/blx_fix.sh \
75              fip/bl30.bin \
76              fip/zero_tmp \
77              fip/bl30_zero.bin \
78              fip/bl301.bin \
79              fip/bl301_zero.bin \
80              fip/bl30_new.bin \
81              bl30
82
83    $ python $FIPDIR/acs_tool.pyc fip/bl2.bin fip/bl2_acs.bin fip/acs.bin 0
84
85    $ $FIPDIR/blx_fix.sh \
86              fip/bl2_acs.bin \
87              fip/zero_tmp \
88              fip/bl2_zero.bin \
89              fip/bl21.bin \
90              fip/bl21_zero.bin \
91              fip/bl2_new.bin \
92              bl2
93
94    $ $FIPDIR/gxl/aml_encrypt_gxl --bl3enc --input fip/bl30_new.bin
95    $ $FIPDIR/gxl/aml_encrypt_gxl --bl3enc --input fip/bl31.img
96    $ $FIPDIR/gxl/aml_encrypt_gxl --bl3enc --input fip/bl33.bin
97    $ $FIPDIR/gxl/aml_encrypt_gxl --bl2sig --input fip/bl2_new.bin --output fip/bl2.n.bin.sig
98    $ $FIPDIR/gxl/aml_encrypt_gxl --bootmk \
99                                  --output fip/u-boot.bin \
100                                  --bl2 fip/bl2.n.bin.sig \
101                                  --bl30 fip/bl30_new.bin.enc \
102                                  --bl31 fip/bl31.img.enc \
103                                  --bl33 fip/bl33.bin.enc
104
105Then write U-Boot to SD or eMMC with:
106
107.. code-block:: bash
108
109    $ DEV=/dev/your_sd_device
110    $ dd if=fip/u-boot.bin.sd.bin of=$DEV conv=fsync,notrunc bs=512 skip=1 seek=1
111    $ dd if=fip/u-boot.bin.sd.bin of=$DEV conv=fsync,notrunc bs=1 count=440
112