See: [ARMHF] Debian 10.x/11.x/12.x Kernel Updates
In our debian images, this is under the bb-u-boot-am335x-evm
package…
debian@21-am335x-bbb:~$ tree /opt/u-boot/bb-u-boot-am335x-evm/
/opt/u-boot/bb-u-boot-am335x-evm/
├── install-mmcblk0.sh
├── install-mmcblk1.sh
├── install.sh
├── MLO
├── u-boot-dtb.img
└── u-boot.img
0 directories, 6 files
This is systemd: https://systemd.io/
Regards,