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# U-boot mainline for the G12a
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## Ready to flash Bootloaders:
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If you don't want to build anything and you are just after some binaries you can flash, you can use:
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* S905D2 - U200 :
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* S905X2 - SEI510 (Franklin) :
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* S905D2 - X96 :
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To make the initial flash, you may side load the bootloader using amlogic `update` tool:
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<insert_url_here_to-flash_update>
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Then put the board in USB boot mode:
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* Plug the USB cable in the appropriate port and in your computer
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* Hard reset the device while pushing the `USB-BOOT` button
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* On the serial console, you should something like this : `G12A:BL:0253b8:61aa2d;FEAT:E0F97180:2000;POC:D;RCY:0;USB:0;` and nothing more. If it keeps on dumping u-boot traces, you failed to put the board in USB boot mode.
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* On the host do :
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```
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./update write u-boot.bin 0xfffa0000 0x10000
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./update run 0xfffa0000
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```
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You should see a few traces from the bl2 running
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```
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sleep 8
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./update bl2_boot u-boot.bin
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```
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You should be in u-boot now \o/
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## Build Mainline u-boot - bl33:
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Like every other ARM64 device, u-boot is just one part of the bootloader, we need a few ATF binaries provided by Amlogic to make a functional u-boot bootloader
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This repository provides the means to generate the bl33 binary, which will be u-boot mainline
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## Build Mainline u-boot - bl33:
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* Download the toolchain : [gcc-linaro-7.2.1-2017.11-x86_64_aarch64-elf](http://releases.linaro.org/components/toolchain/binaries/7.2-2017.11/aarch64-elf/gcc-linaro-7.2.1-2017.11-x86_64_aarch64-elf.tar.xz)
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* Compile
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```shell
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export PATH=<path-to-toolchain>/gcc-linaro-7.2.1-2017.11-x86_64_aarch64-elf/bin:$PATH
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export CROSS_COMPILE=aarch64-elf-
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make u200_defconfig
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make
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```
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* the `u-boot-bin` is the bl33
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## Get Amlogic FIP binaries:
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### The easy way - pre-packaged binaries:
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The easiest way is to use the binaries we already packaged:
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* S905D2 - U200 :
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* S905X2 - SEI510 (Franklin) :
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* S905D2 - X96 :
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### The hard way - packaging the binaries from Amlogic's buildroot:
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The goal here is to collect the bl2, bl21, bl30, bl31, bl301 and acs.bin
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Some of these binaries are directly provided by the buildroot package of Amlogic, other must be generated from the vendor u-boot.
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* Download the buildroot package: http://openlinux2.amlogic.com:8000/download/ARM/filesystem/Linux_BSP/buildroot_openlinux_kernel_4.9_20180131.tar.gz
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* Download the necessary toolchains:
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- [linaro-aarch64-none-elf-4.8-2013.11_linux](https://releases.linaro.org/archive/13.11/components/toolchain/binaries/gcc-linaro-aarch64-none-elf-4.8-2013.11_linux.tar.xz)
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- [linaro-arm-none-eabi-4.8-2013.11_linux](https://releases.linaro.org/archive/13.11/components/toolchain/binaries/gcc-linaro-arm-none-eabi-4.8-2013.11_linux.tar.xz)
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* Compile vendor u-boot:
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```shell
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export PATH=<path-to-toolchain>/gcc-linaro-aarch64-none-elf-4.8-2013.11_linux/bin:<path-to-toolchain>/gcc-linaro-arm-none-eabi-4.8-2013.11_linux/bin/:$PATH
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cd <amlogic-build-root>/bootloader/uboot-repo/
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make libretech_cc_defconfig
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make
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```
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* Finally, collect the binaries:
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```
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mkdir collect-dir
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cp ${BRDIR}/bootloader/uboot-repo/build/scp_task/bl301.bin $TMP/
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cp ${BRDIR}/bootloader/uboot-repo/build/board/amlogic/${BOARDCFG}/firmware/bl21.bin $TMP/
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cp ${BRDIR}/bootloader/uboot-repo/build/board/amlogic/${BOARDCFG}/firmware/acs.bin $TMP/
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cp ${BRDIR}/bootloader/uboot-repo/fip/${SOCFAMILY}/aml_encrypt_${SOCFAMILY} $TMP/aml_encrypt
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cp ${BRDIR}/bootloader/uboot-repo/fip/acs_tool.pyc $TMP
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cp ${BRDIR}/bootloader/uboot-repo/bl2/bin/${SOCFAMILY}/bl2.bin $TMP/
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cp ${BRDIR}/bootloader/uboot-repo/bl30/bin/${SOCFAMILY}/bl30.bin $TMP/
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```
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OR you can use this script [collect-aml-binaries-new.sh](uploads/afa7f471af14fad11783bf77f2c3a968/collect-aml-binaries-new.sh) which will do it for you
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```
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./collect-aml-binaries.sh <buildroot dir> <vendor-u-boot-path> gxl libretech-cc
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```
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## Package the Binaries
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To package the binaries together and make something we can flash, we must follow some obscure procedure which you can read in the scripts that amlogic's buildroot uses.
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These tends to change betweeen soc and u-boot versions. Best is to just use what we previously packaged and this script [generate-bins-new.sh](uploads/425dd3fd9b999bbc08c3c3b5e95664e7/generate-bins-new.sh)
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```shell
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./generate-bins-new.sh <fip-collect-directory> <target-bl33-binary>
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```
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this will generate a directory with the following binaries
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* `u-boot.bin`: binary to flash on the emmc or the spi:
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* emmc: remember skip the first sector: `mmc write $fileaddr 1 $bin_block_num`. You may choose to write the u-boot on the boot partitions of the eMMC. The boot order is `user` -> `boot 0` -> `boot 1`.
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* `u-boot.bin.sd.bin` : **NO YET TESTED** Binary to boot from an sdcard: remember to leave room for the MBR : [write-u-boot.sh](uploads/0b4d640b26473a2783751482d1e311e8/write-u-boot.sh) |
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\ No newline at end of file |
