Debian Customizing U-Boot AM62

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VAR-SOM-AM62 - Debian Customize from source code

Introduction

This guide demonstrates how to patch and rebuild the VAR-SOM-AM62 U-Boot images.

To learn how to build the U-Boot images outside of Yocto, see: Build U-Boot from source code

Add your patches on top of the Variscite source code

Fetch the U-Boot source:

$ MACHINE=am62x-var-som bitbake -c unpack virtual/bootloader
$ mkdir -p ../local_repos/ti-u-boot
$ cp -a arago-tmp-default-glibc/work/am62x_var_som-oe-linux/u-boot-variscite/<uboot version>/git/. ../local_repos/ti-u-boot
$ cd ../local_repos/ti-u-boot
$ git reset --hard
$ git clean -fdx

Next, make the desired changes to the U-Boot source code. After changing the source code, create a diff file:

$ cd ~/var-ti-yocto/local_repos/ti-u-boot
$ vim board/variscite/am62x_var_som/am62x_var_som.c
$ vim include/configs/am62x_var_som.h

edit and save

$ git diff > ~/var-ti-yocto/tisdk/sources/meta-variscite-bsp-ti/recipes-bsp/u-boot/u-boot-variscite/uboot.diff

Please refer How to Download Debian Source Code and to apply the above created U-Boot patch when building the Debian image.After cloned the debian source code , the code will be located under ~/debian_am62x_var_som/ti-bdebstrap/.

Create the directory ~/debian_am62x_var_som/ti-bdebstrap/patches/ti-u-boot and copy the uboot.diff patch.

$ mkdir -p ~/debian_am62x_var_som/ti-bdebstrap/patches/ti-u-boot
$ cp ~/var-ti-yocto/tisdk/sources/meta-variscite-bsp-ti/recipes-bsp/u-boot/u-boot-variscite/uboot.diff  ~/debian_am62x_var_som/ti-bdebstrap/patches/ti-u-boot

Refer to Build and flash the Debian image with uboot changes.

Use your remote repository on GitHub

Create a GitHub account and upload your proprietary U-Boot to a new repository: You can fork our repository to your account by visiting the following link and clicking on "Fork" at the top right of the screen: https://github.com/varigit/ti-u-boot/tree/ti-u-boot-2023.04_09.02.01.10_var01

Alternatively, you can clone the repository to your local machine, and push it later to your account.

Refer to How to Download Debian Source Code. After downloading the source, open the file ~/debian_am62x_var_som/ti-bdebstrap/configs/bsp_sources.toml and locate the tag 09.02.01.10_var01.

   atf_srcrev = "00f1ec6b8740ccd403e641131e294aabacf2a48b"
   optee_srcrev = "012cdca49db398693903e05c42a254a3a0c0d8f2"
   uboot_srcuri = "https://github.com/varigit/ti-u-boot.git"  #change to your repository name of uboot
   uboot_srcrev = "80ceb4d91326e00edd22a3fabf5dd2d64f6a7635"  #update the hash with the latest commit
   linux_fw_srcrev = "09.02.00.010"

Finally refer to Build the Debian image with updated u-boot repository.