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| <!-- Set release according to "release" parameter in URL and use am62-yocto-dunfell-5.10.140_08.06.00.42-v1.0 as default | | <includeonly>deleteme</includeonly> |
| --> {{INIT_RELEASE_PARAM|am62-yocto-dunfell-5.10.140_08.06.00.42-v1.0}}<!--
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| --> {{#lst:Yocto_Platform_Customization|{{#var:RELEASE_PARAM}}}} <!--
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| --> {{#vardefine:UBUNTU_COMPAT|18.04/20.04/22.04}}<!--
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| -->
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| = Introduction =
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| This guide walks through the process for building Variscite's reference Yocto image from source code. It is derived from TI's guide [https://software-dl.ti.com/processor-sdk-linux/esd/AM62X/{{#var:TI_RELEASE_}}/exports/docs/linux/Overview_Building_the_SDK.html?highlight=bitbake Overview Building the SDK]
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| = Installing required packages =
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| Please make sure your host PC is running Ubuntu {{#var:UBUNTU_COMPAT}} 64-bit and is up to date:
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| $ sudo apt-get update && sudo apt-get dist-upgrade
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| Then, install the following packages:
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| $ sudo dpkg --add-architecture i386
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| $ sudo apt update && sudo apt install build-essential autoconf \
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| automake bison \
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| flex libssl-dev bc u-boot-tools \
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| python diffstat \
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| texinfo gawk chrpath dos2unix \
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| wget unzip socat doxygen libc6:i386 \
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| libncurses5:i386 libstdc++6:i386 \
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| libz1:i386 g++-multilib \
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| git python3-distutils python3-apt
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| By default Ubuntu uses “dash” as the default shell for /bin/sh. You must reconfigure to use bash by running the following command:
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| $ sudo dpkg-reconfigure dash
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| Be sure to select “No” when you are asked to use dash as the default system shell.
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| = Install Toolchains to home directory =
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| $ cd ~
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| $ wget {{#var:armv7_toolchain_url}} && \
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| tar -Jxvf {{#var:armv7_toolchain_archive}} -C $HOME && \
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| wget {{#var:armv8_toolchain_url}} && \
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| tar -Jxvf {{#var:armv8_toolchain_archive}} -C $HOME
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| = Download Yocto {{#var:YOCTO_NAME}} and setup environment =
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| Download the source code:
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| $ mkdir ~/var-ti-yocto && cd ~/var-ti-yocto
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| $ git clone {{#var:OE_LAYERSETUP_GIT}} tisdk
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| $ cd tisdk
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| $ ./oe-layertool-setup.sh -f {{#var:OE_LAYERSETUP_MANIFEST_PATH}}
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| Next, setup the environment. The above commands are only required for the very first build setup: whenever restarting a newer build session (from a different terminal or in a different time), you can skip the full setup and just run:
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| $ cd build
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| $ . conf/setenv
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| $ export TOOLCHAIN_PATH_ARMV7=$HOME/{{#var:armv7_toolchain}} && \
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| export TOOLCHAIN_PATH_ARMV8=$HOME/{{#var:armv8_toolchain}}
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| = Build GUI demo image =
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| $ MACHINE=am62x-var-som bitbake var-default-image
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| = Create a bootable SD card =
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| The wic image fully supports booting from an SD Card. Use the command below to write it to an SD Card:
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| $ xzcat arago-tmp-external-arm-glibc/deploy/images/am62x-var-som/var-default-image-am62x-var-som.wic.xz | sudo dd of=/dev/sdX bs=1M && sync
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| {{note|'''NOTE''': The wic image does not support all features booting from eMMC. For example, /etc/fw_env.config is configured for the SD Card (/dev/mmcblk1) |info}}
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| = Create a Recovery SD card =
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| As mentioned above, the wic image only supports booting from an SD card. To flash an image to eMMC, Variscite provides an image '''var-recovery-sd-image''', which inherits '''var-default-image''' and adds the following files needed for installing to eMMC:
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| /usr/bin/install_yocto.sh
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| /usr/bin/echos.sh
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| /opt/images/Yocto/
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| /opt/images/Yocto/boot
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| /opt/images/Yocto/boot/u-boot.img
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| /opt/images/Yocto/boot/tiboot3.bin
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| /opt/images/Yocto/boot/wificfg
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| /opt/images/Yocto/boot/tispl.bin
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| /opt/images/Yocto/boot/uEnv.txt
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| /opt/images/Yocto/rootfs.tar.xz
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| Build the image:
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| $ MACHINE=am62x-var-som bitbake var-recovery-sd-image
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| Write it to an SD Card:
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| $ xzcat arago-tmp-external-arm-glibc/deploy/images/am62x-var-som/var-recovery-sd-image-am62x-var-som.wic.xz | sudo dd of=/dev/sdX bs=1M && sync
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| Note: Some SD card duplicator machines do not support 64-bit filesystems. To build a recovery SD card image with 32-bit filesystems, add '''MKE2FS_NO_64="y"''' to '''conf/local.conf''' and rebuild the image:
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| $ echo 'KE2FS_NO_64="y"' >> conf/local.conf
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