1U-Boot for NanoPi-K2
2====================
3
4NanoPi-K2 is a single board computer manufactured by FriendlyElec
5with the following specifications:
6
7 - Amlogic S905 ARM Cortex-A53 quad-core SoC @ 1.5GHz
8 - ARM Mali 450 GPU
9 - 2GB DDR3 SDRAM
10 - Gigabit Ethernet
11 - HDMI 2.0 4K/60Hz display
12 - 40-pin GPIO header
13 - 4 x USB 2.0 Host, 1 x USB OTG
14 - eMMC, microSD
15 - Infrared receiver
16
17Schematics are available on the manufacturer website.
18
19Currently the u-boot port supports the following devices:
20 - serial
21 - eMMC, microSD
22 - Ethernet
23
24u-boot compilation
25==================
26
27 > export ARCH=arm
28 > export CROSS_COMPILE=aarch64-none-elf-
29 > make nanopi-k2_defconfig
30 > make
31
32Image creation
33==============
34
35Amlogic doesn't provide sources for the firmware and for tools needed
36to create the bootloader image, so it is necessary to obtain them from
37the git tree published by the board vendor:
38
39 > wget https://releases.linaro.org/archive/13.11/components/toolchain/binaries/gcc-linaro-aarch64-none-elf-4.8-2013.11_linux.tar.xz
40 > wget https://releases.linaro.org/archive/13.11/components/toolchain/binaries/gcc-linaro-arm-none-eabi-4.8-2013.11_linux.tar.xz
41 > tar xvfJ gcc-linaro-aarch64-none-elf-4.8-2013.11_linux.tar.xz
42 > tar xvfJ gcc-linaro-arm-none-eabi-4.8-2013.11_linux.tar.xz
43 > 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:$PATH
44 > git clone https://github.com/BayLibre/u-boot.git -b libretech-cc amlogic-u-boot
45 > git clone https://github.com/friendlyarm/u-boot.git -b nanopi-k2-v2015.01 amlogic-u-boot
46 > cd amlogic-u-boot
47 > sed -i 's/aarch64-linux-gnu-/aarch64-none-elf-/' Makefile
48 > sed -i 's/arm-linux-/arm-none-eabi-/' arch/arm/cpu/armv8/gxb/firmware/scp_task/Makefile
49 > make nanopi-k2_defconfig
50 > make
51 > export FIPDIR=$PWD/fip
52
53Go back to mainline U-Boot source tree then :
54 > mkdir fip
55
56 > cp $FIPDIR/gxb/bl2.bin fip/
57 > cp $FIPDIR/gxb/acs.bin fip/
58 > cp $FIPDIR/gxb/bl21.bin fip/
59 > cp $FIPDIR/gxb/bl30.bin fip/
60 > cp $FIPDIR/gxb/bl301.bin fip/
61 > cp $FIPDIR/gxb/bl31.img fip/
62 > cp u-boot.bin fip/bl33.bin
63
64 > $FIPDIR/blx_fix.sh \
65	fip/bl30.bin \
66	fip/zero_tmp \
67	fip/bl30_zero.bin \
68	fip/bl301.bin \
69	fip/bl301_zero.bin \
70	fip/bl30_new.bin \
71	bl30
72
73 > $FIPDIR/fip_create \
74	 --bl30 fip/bl30_new.bin \
75	 --bl31 fip/bl31.img \
76	 --bl33 fip/bl33.bin \
77	 fip/fip.bin
78
79 > python $FIPDIR/acs_tool.pyc fip/bl2.bin fip/bl2_acs.bin fip/acs.bin 0
80
81 > $FIPDIR/blx_fix.sh \
82	fip/bl2_acs.bin \
83	fip/zero_tmp \
84	fip/bl2_zero.bin \
85	fip/bl21.bin \
86	fip/bl21_zero.bin \
87	fip/bl2_new.bin \
88	bl2
89
90 > cat fip/bl2_new.bin fip/fip.bin > fip/boot_new.bin
91
92 > $FIPDIR/gxb/aml_encrypt_gxb --bootsig \
93		--input fip/boot_new.bin
94		--output fip/u-boot.bin
95
96and then write the image to SD with:
97
98 > DEV=/dev/your_sd_device
99 > dd if=fip/u-boot.bin of=$DEV conv=fsync,notrunc bs=512 seek=1
100