1.. SPDX-License-Identifier: GPL-2.0+
2
3U-Boot for LibreTech AC
4=======================
5
6LibreTech AC is a single board computer manufactured by Libre Technology
7with the following specifications:
8
9 - Amlogic S805X ARM Cortex-A53 quad-core SoC @ 1.2GHz
10 - ARM Mali 450 GPU
11 - 512MiB DDR4 SDRAM
12 - 10/100 Ethernet
13 - HDMI 2.0 4K/60Hz display
14 - 40-pin GPIO header
15 - 4 x USB 2.0 Host
16 - eMMC, SPI NOR Flash
17 - Infrared receiver
18
19Schematics are available on the manufacturer website.
20
21U-Boot compilation
22------------------
23
24.. code-block:: bash
25
26    $ export CROSS_COMPILE=aarch64-none-elf-
27    $ make libretech-ac_defconfig
28    $ make
29
30Image creation
31--------------
32
33Amlogic doesn't provide sources for the firmware and for tools needed
34to create the bootloader image, so it is necessary to obtain them from
35the git tree published by the board vendor:
36
37.. code-block:: bash
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-ac amlogic-u-boot
45    $ cd amlogic-u-boot
46    $ wget https://raw.githubusercontent.com/BayLibre/u-boot/libretech-cc/fip/blx_fix.sh
47    $ make libretech_ac_defconfig
48    $ make
49    $ export UBOOTDIR=$PWD
50
51Download the latest Amlogic Buildroot package, and extract it :
52
53.. code-block:: bash
54
55    $ wget http://openlinux2.amlogic.com:8000/ARM/filesystem/Linux_BSP/buildroot_openlinux_kernel_4.9_fbdev_20180418.tar.gz
56    $ tar xfz buildroot_openlinux_kernel_4.9_fbdev_20180418.tar.gz buildroot_openlinux_kernel_4.9_fbdev_20180418/bootloader
57    $ export BRDIR=$PWD/buildroot_openlinux_kernel_4.9_fbdev_20180418
58
59Go back to mainline U-Boot source tree then :
60
61.. code-block:: bash
62
63    $ mkdir fip
64
65    $ cp $UBOOTDIR/build/scp_task/bl301.bin fip/
66    $ cp $UBOOTDIR/build/board/amlogic/libretech_ac/firmware/bl21.bin fip/
67    $ cp $UBOOTDIR/build/board/amlogic/libretech_ac/firmware/acs.bin fip/
68    $ cp $BRDIR/bootloader/uboot-repo/bl2/bin/gxl/bl2.bin fip/
69    $ cp $BRDIR/bootloader/uboot-repo/bl30/bin/gxl/bl30.bin fip/
70    $ cp $BRDIR/bootloader/uboot-repo/bl31/bin/gxl/bl31.img fip/
71    $ cp u-boot.bin fip/bl33.bin
72
73    $ sh $UBOOTDIR/blx_fix.sh \
74    	fip/bl30.bin \
75    	fip/zero_tmp \
76    	fip/bl30_zero.bin \
77    	fip/bl301.bin \
78    	fip/bl301_zero.bin \
79    	fip/bl30_new.bin \
80    	bl30
81
82    $ $BRDIR/bootloader/uboot-repo/fip/acs_tool.pyc fip/bl2.bin fip/bl2_acs.bin fip/acs.bin 0
83
84    $ sh $UBOOTDIR/blx_fix.sh \
85    	fip/bl2_acs.bin \
86    	fip/zero_tmp \
87    	fip/bl2_zero.bin \
88    	fip/bl21.bin \
89    	fip/bl21_zero.bin \
90    	fip/bl2_new.bin \
91    	bl2
92
93    $ $BRDIR/bootloader/uboot-repo/fip/gxl/aml_encrypt_gxl --bl3enc --input fip/bl30_new.bin
94    $ $BRDIR/bootloader/uboot-repo/fip/gxl/aml_encrypt_gxl --bl3enc --input fip/bl31.img
95    $ $BRDIR/bootloader/uboot-repo/fip/gxl/aml_encrypt_gxl --bl3enc --input fip/bl33.bin
96    $ $BRDIR/bootloader/uboot-repo/fip/gxl/aml_encrypt_gxl --bl2sig --input fip/bl2_new.bin --output fip/bl2.n.bin.sig
97    $ $BRDIR/bootloader/uboot-repo/fip/gxl/aml_encrypt_gxl --bootmk \
98    		--output fip/u-boot.bin \
99    		--bl2 fip/bl2.n.bin.sig \
100    		--bl30 fip/bl30_new.bin.enc \
101    		--bl31 fip/bl31.img.enc \
102    		--bl33 fip/bl33.bin.enc
103
104and then write the image to SD with:
105
106.. code-block:: bash
107
108    $ DEV=/dev/your_sd_device
109    $ dd if=fip/u-boot.bin.sd.bin of=$DEV conv=fsync,notrunc bs=512 skip=1 seek=1
110    $ dd if=fip/u-boot.bin.sd.bin of=$DEV conv=fsync,notrunc bs=1 count=444
111