Download here the starter archive containing skeleton files + scripts.

Extract it somewhere in a new directory (e.g., create rauc-lab).

The code structure will become (mostly is, but some are TODO) as follows:

rauc-lab/
├── artifacts/       # <-- you'll create this
│   ├── flash_spl.bin         # A working flash.bin image you already have
│   ├── flash_emmc.bin        # Your new flash.bin (see tasks)
│   ├── linux.itb             # A kernel image (after removing the initrd)
│   ├── uboot.env             # U-Boot environment variables (just the var file)
├── utils/
│   ├── ca.cert.pem
│   ├── rauc-mark-good.service
│   ├── system.conf
│   └── fstab                 # Optional custom fstab
├── scripts/         # <-- your main job to finish those!
│   ├── 05-debootstrap.sh
│   ├── 10-create-base-disk.sh
│   ├── 11-populate-disk-image.sh
│   ├── 20-modify-bootcmd.sh
│   ├── 21-install-boot.sh
│   └── 30-install-rauc.sh
├── run-all.sh               # Will run all scripts in order

First, make sure you have these packages installed on your host system (they were already installed on the VM, so you can skip this):

sudo apt install qemu-user-static binfmt-support debootstrap parted dosfstools e2fsprogs u-boot-tools

Then, check that binfmt_misc is active and register the QEMU handler for aarch64:

grep aarch64 /proc/sys/fs/binfmt_misc/qemu-aarch64

If it’s empty, run:

sudo su
echo ':qemu-aarch64:M::\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xb7\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff:/usr/bin/qemu-aarch64-static:CF' > /proc/sys/fs/binfmt_misc/register
exit

For Arch Linux users: check out this guide for installable dependencies!