1U-Boot for Khadas VIM2
2=======================
3
4Khadas VIM2 is an Open Source DIY Box manufactured by Shenzhen Wesion
5Technology Co., Ltd with the following specifications:
6
7 - Amlogic S912 ARM Cortex-A53 octo-core SoC @ 1.5GHz
8 - ARM Mali T860 GPU
9 - 2/3GB DDR4 SDRAM
10 - 10/100/1000 Ethernet
11 - HDMI 2.0 4K/60Hz display
12 - 40-pin GPIO header
13 - 2 x USB 2.0 Host, 1 x USB 2.0 Type-C OTG
14 - 16GB/32GB/64GB eMMC
15 - 2MB SPI Flash
16 - microSD
17 - SDIO Wifi Module, Bluetooth
18 - Two channels IR receiver
19
20Currently the u-boot port supports the following devices:
21 - serial
22 - eMMC, microSD
23 - Ethernet
24 - I2C
25 - Regulators
26 - Reset controller
27 - Clock controller
28 - USB Host
29 - ADC
30
31U-Boot compilation
32==================
33
34 > export ARCH=arm
35 > export CROSS_COMPILE=aarch64-none-elf-
36 > make khadas-vim2_defconfig
37 > make
38
39Image creation
40==============
41
42Amlogic doesn't provide sources for the firmware and for tools needed
43to create the bootloader image, so it is necessary to obtain them from
44the git tree published by the board vendor:
45
46 > wget https://releases.linaro.org/archive/13.11/components/toolchain/binaries/gcc-linaro-aarch64-none-elf-4.8-2013.11_linux.tar.xz
47 > wget https://releases.linaro.org/archive/13.11/components/toolchain/binaries/gcc-linaro-arm-none-eabi-4.8-2013.11_linux.tar.xz
48 > tar xvfJ gcc-linaro-aarch64-none-elf-4.8-2013.11_linux.tar.xz
49 > tar xvfJ gcc-linaro-arm-none-eabi-4.8-2013.11_linux.tar.xz
50 > 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:$PATH
51 > git clone https://github.com/khadas/u-boot -b Vim vim-u-boot
52 > cd vim-u-boot
53 > make kvim_defconfig
54 > make
55 > export FIPDIR=$PWD/fip
56
57Go back to mainline U-Boot source tree then :
58 > mkdir fip
59
60 > cp $FIPDIR/gxl/bl2.bin fip/
61 > cp $FIPDIR/gxl/acs.bin fip/
62 > cp $FIPDIR/gxl/bl21.bin fip/
63 > cp $FIPDIR/gxl/bl30.bin fip/
64 > cp $FIPDIR/gxl/bl301.bin fip/
65 > cp $FIPDIR/gxl/bl31.img fip/
66 > cp u-boot.bin fip/bl33.bin
67
68 > $FIPDIR/blx_fix.sh \
69	fip/bl30.bin \
70	fip/zero_tmp \
71	fip/bl30_zero.bin \
72	fip/bl301.bin \
73	fip/bl301_zero.bin \
74	fip/bl30_new.bin \
75	bl30
76
77 > python $FIPDIR/acs_tool.pyc fip/bl2.bin fip/bl2_acs.bin fip/acs.bin 0
78
79 > $FIPDIR/blx_fix.sh \
80	fip/bl2_acs.bin \
81	fip/zero_tmp \
82	fip/bl2_zero.bin \
83	fip/bl21.bin \
84	fip/bl21_zero.bin \
85	fip/bl2_new.bin \
86	bl2
87
88 > $FIPDIR/gxl/aml_encrypt_gxl --bl3enc --input fip/bl30_new.bin
89 > $FIPDIR/gxl/aml_encrypt_gxl --bl3enc --input fip/bl31.img
90 > $FIPDIR/gxl/aml_encrypt_gxl --bl3enc --input fip/bl33.bin
91 > $FIPDIR/gxl/aml_encrypt_gxl --bl2sig --input fip/bl2_new.bin --output fip/bl2.n.bin.sig
92 > $FIPDIR/gxl/aml_encrypt_gxl --bootmk \
93		--output fip/u-boot.bin \
94		--bl2 fip/bl2.n.bin.sig \
95		--bl30 fip/bl30_new.bin.enc \
96		--bl31 fip/bl31.img.enc \
97		--bl33 fip/bl33.bin.enc
98
99and then write the image to SD with:
100
101 > DEV=/dev/your_sd_device
102 > dd if=fip/u-boot.bin.sd.bin of=$DEV conv=fsync,notrunc bs=512 skip=1 seek=1
103 > dd if=fip/u-boot.bin.sd.bin of=$DEV conv=fsync,notrunc bs=1 count=444
104