U-Boot for NanoPi-K2 (S905)
NanoPi-K2 is a single board computer manufactured by FriendlyElec with the following specifications:
Amlogic S905 ARM Cortex-A53 quad-core SoC @ 1.5GHz
ARM Mali 450 GPU
2GB DDR3 SDRAM
Gigabit Ethernet
HDMI 2.0 4K/60Hz display
40-pin GPIO header
4 x USB 2.0 Host, 1 x USB OTG
eMMC, microSD
Infrared receiver
Schematics are available on the manufacturer website.
U-Boot Compilation
$ export CROSS_COMPILE=aarch64-none-elf-
$ make nanopi-k2_defconfig
$ make
U-Boot Signing with Pre-Built FIP repo
$ git clone https://github.com/LibreELEC/amlogic-boot-fip --depth=1
$ cd amlogic-boot-fip
$ mkdir my-output-dir
$ ./build-fip.sh nanopi-k2 /path/to/u-boot/u-boot.bin my-output-dir
U-Boot Manual Signing
Amlogic does not provide sources for the firmware and tools needed to create a bootloader image so it is necessary to obtain binaries from sources 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
$ git clone https://github.com/friendlyarm/u-boot.git -b nanopi-k2-v2015.01 amlogic-u-boot
$ cd amlogic-u-boot
$ sed -i 's/aarch64-linux-gnu-/aarch64-none-elf-/' Makefile
$ sed -i 's/arm-linux-/arm-none-eabi-/' arch/arm/cpu/armv8/gxb/firmware/scp_task/Makefile
$ make nanopi-k2_defconfig
$ make
$ export FIPDIR=$PWD/fip
Go back to the mainline U-Boot source tree then:
$ mkdir fip
$ cp $FIPDIR/gxb/bl2.bin fip/
$ cp $FIPDIR/gxb/acs.bin fip/
$ cp $FIPDIR/gxb/bl21.bin fip/
$ cp $FIPDIR/gxb/bl30.bin fip/
$ cp $FIPDIR/gxb/bl301.bin fip/
$ cp $FIPDIR/gxb/bl31.img fip/
$ cp u-boot.bin fip/bl33.bin
$ wget https://github.com/LibreELEC/amlogic-boot-fip/raw/master/nanopi-k2/bl1.bin.hardkernel fip/bl1.bin.hardkernel
$ chmod +x fip/bl1.bin.hardkernel
$ wget https://github.com/LibreELEC/amlogic-boot-fip/raw/master/nanopi-k2/aml_chksum fip/aml_chksum
$ chmod +x fip/aml_chksum
$ $FIPDIR/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
$ $FIPDIR/fip_create --bl30 fip/bl30_new.bin \
--bl31 fip/bl31.img \
--bl33 fip/bl33.bin \
fip/fip.bin
$ sed -i 's/\x73\x02\x08\x91/\x1F\x20\x03\xD5/' fip/bl2.bin
$ python $FIPDIR/acs_tool.pyc fip/bl2.bin fip/bl2_acs.bin fip/acs.bin 0
$ $FIPDIR/blx_fix.sh \
fip/bl2_acs.bin \
fip/zero_tmp \
fip/bl2_zero.bin \
fip/bl21.bin \
fip/bl21_zero.bin \
fip/bl2_new.bin \
bl2
$ cat fip/bl2_new.bin fip/fip.bin > fip/boot_new.bin
$ $FIPDIR/gxb/aml_encrypt_gxb --bootsig \
--input fip/boot_new.bin
--output fip/u-boot.bin
Then write U-Boot to SD or eMMC with:
$ DEV=/dev/boot_device
$ dd if=fip/u-boot.bin of=fip/u-boot.bin.gxbb bs=512 conv=fsync
$ dd if=fip/u-boot.bin of=fip/u-boot.bin.gxbb bs=512 seek=9 skip=8 count=87 conv=fsync,notrunc
$ dd if=/dev/zero of=fip/u-boot.bin.gxbb bs=512 seek=8 count=1 conv=fsync,notrunc
$ dd if=bl1.bin.hardkernel of=fip/u-boot.bin.gxbb bs=512 seek=2 skip=2 count=1 conv=fsync,notrunc
$ ./aml_chksum fip/u-boot.bin.gxbb
$ dd if=fip/u-boot.gxbb of=$DEV conv=fsync,notrunc bs=512 skip=1 seek=1
$ dd if=fip/u-boot.gxbb of=$DEV conv=fsync,notrunc bs=1 count=440