boards: Amlogic: Add support for Libretech-AC

LibreTech AC is a single board computer manufactured by Libre Technology
with the following specifications:

 - Amlogic S805X ARM Cortex-A53 quad-core SoC @ 1.2GHz
 - ARM Mali 450 GPU
 - 512MiB DDR4 SDRAM
 - 10/100 Ethernet
 - HDMI 2.0 4K/60Hz display
 - 40-pin GPIO header
 - 4 x USB 2.0 Host
 - eMMC, SPI NOR Flash
 - Infrared receiver

The u-boot specific code is the same as the P212 support,
so use the P212 board support code with a distinct defconfig
and config include files.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>

2 files changed, 104 insertions, 0 deletions

diff --git a/board/amlogic/p212/MAINTAINERS b/board/amlogic/p212/MAINTAINERS
index 07ca6f204d5..74ad3716ec7 100644
--- a/board/amlogic/p212/MAINTAINERS
+++ b/board/amlogic/p212/MAINTAINERS
@@ -4,5 +4,6 @@ S:	Maintained
 F:	board/amlogic/p212/
 F:	include/configs/p212.h
 F:	configs/khadas-vim_defconfig
+F:	configs/libretech-ac_defconfig
 F:	configs/libretech-cc_defconfig
 F:	configs/p212_defconfig
diff --git a/board/amlogic/p212/README.libretech-ac b/board/amlogic/p212/README.libretech-ac
new file mode 100644
index 00000000000..538604261b8
--- /dev/null
+++ b/board/amlogic/p212/README.libretech-ac
@@ -0,0 +1,103 @@
+U-Boot for LibreTech AC
+=======================
+
+LibreTech AC is a single board computer manufactured by Libre Technology
+with the following specifications:
+
+ - Amlogic S805X ARM Cortex-A53 quad-core SoC @ 1.2GHz
+ - ARM Mali 450 GPU
+ - 512MiB DDR4 SDRAM
+ - 10/100 Ethernet
+ - HDMI 2.0 4K/60Hz display
+ - 40-pin GPIO header
+ - 4 x USB 2.0 Host
+ - eMMC, SPI NOR Flash
+ - Infrared receiver
+
+Schematics are available on the manufacturer website.
+
+Currently the U-Boot port supports the following devices:
+ - serial
+ - eMMC
+ - Ethernet
+ - USB
+
+U-Boot compilation
+==================
+
+ > export ARCH=arm
+ > export CROSS_COMPILE=aarch64-none-elf-
+ > make libretech-ac_defconfig
+ > make
+
+Image creation
+==============
+
+Amlogic doesn't provide sources for the firmware and for tools needed
+to create the bootloader image, so it is necessary to obtain them from
+the git tree 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:$PATH
+ > git clone https://github.com/BayLibre/u-boot.git -b libretech-ac amlogic-u-boot
+ > cd amlogic-u-boot
+ > wget https://raw.githubusercontent.com/BayLibre/u-boot/libretech-cc/fip/blx_fix.sh
+ > make libretech_ac_defconfig
+ > make
+ > export UBOOTDIR=$PWD
+
+Download the latest Amlogic Buildroot package, and extract it :
+ > wget http://openlinux2.amlogic.com:8000/ARM/filesystem/Linux_BSP/buildroot_openlinux_kernel_4.9_fbdev_20180418.tar.gz
+ > tar xfz buildroot_openlinux_kernel_4.9_fbdev_20180418.tar.gz buildroot_openlinux_kernel_4.9_fbdev_20180418/bootloader
+ > export BRDIR=$PWD/buildroot_openlinux_kernel_4.9_fbdev_20180418
+
+Go back to mainline U-Boot source tree then :
+ > mkdir fip
+
+ > cp $UBOOTDIR/build/scp_task/bl301.bin fip/
+ > cp $UBOOTDIR/build/board/amlogic/libretech_ac/firmware/bl21.bin fip/
+ > cp $UBOOTDIR/build/board/amlogic/libretech_ac/firmware/acs.bin fip/
+ > cp $BRDIR/bootloader/uboot-repo/bl2/bin/gxl/bl2.bin fip/
+ > cp $BRDIR/bootloader/uboot-repo/bl30/bin/gxl/bl30.bin fip/
+ > cp $BRDIR/bootloader/uboot-repo/bl31/bin/gxl/bl31.img fip/
+ > cp u-boot.bin fip/bl33.bin
+
+ > sh $UBOOTDIR/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
+
+ > $BRDIR/bootloader/uboot-repo/fip/acs_tool.pyc fip/bl2.bin fip/bl2_acs.bin fip/acs.bin 0
+
+ > sh $UBOOTDIR/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
+
+ > $BRDIR/bootloader/uboot-repo/fip/gxl/aml_encrypt_gxl --bl3enc --input fip/bl30_new.bin
+ > $BRDIR/bootloader/uboot-repo/fip/gxl/aml_encrypt_gxl --bl3enc --input fip/bl31.img
+ > $BRDIR/bootloader/uboot-repo/fip/gxl/aml_encrypt_gxl --bl3enc --input fip/bl33.bin
+ > $BRDIR/bootloader/uboot-repo/fip/gxl/aml_encrypt_gxl --bl2sig --input fip/bl2_new.bin --output fip/bl2.n.bin.sig
+ > $BRDIR/bootloader/uboot-repo/fip/gxl/aml_encrypt_gxl --bootmk \
+		--output fip/u-boot.bin \
+		--bl2 fip/bl2.n.bin.sig \
+		--bl30 fip/bl30_new.bin.enc \
+		--bl31 fip/bl31.img.enc \
+		--bl33 fip/bl33.bin.enc
+
+and then write the image to SD with:
+
+ > DEV=/dev/your_sd_device
+ > dd if=fip/u-boot.bin.sd.bin of=$DEV conv=fsync,notrunc bs=512 skip=1 seek=1
+ > dd if=fip/u-boot.bin.sd.bin of=$DEV conv=fsync,notrunc bs=1 count=444