Download here the starter archive containing starter (skeleton) files & scripts.

Extract it somewhere in your base working directory.

The code structure should be similar to this:

arm-summer-school/
├── staging/         # you should have this from lab02
│   ├── linux-*.its  # Two variants of Linux uImage source descriptors
│   ├── Makefile     # a Makefile to build linux.itb (finally!)
│   └── Image,imx93-11x11-frdm.dtb,rootfs.cpio   # copied by the Makefile
├── rauc-utils/      # RAUC installation 'package'!
│   ├── install.sh       # RAUC installation script (must be ran inside the chroot!)
│   ├── ca.cert.pem
│   ├── rauc-mark-good.service
│   ├── system.conf
│   └── fstab            # Optional, custom fstab to mount /boot
├── linux/               # Linux kernel source directory
├── u-boot/              # u-boot source directory
├── debian-rootfs/       # will be created by 'mk-debian-rootfs.sh'
├── Makefile             # Makefile to build flash.bin from labs 1-3 (u-boot mainline!)
├── newdefault.env       # new/recommended u-boot default environment
├── uboot-extra.config   # extra config to use (used by Makefile above)
├── mk-disk-image.sh     # script to build a FAT32 + EXT4 disk image (solved in lab02/03)
├── mk-disk-image2.sh    # new disk image script, modified to make 2*rootfs+data partitions
├── mk-debian-rootfs.sh  # script to debootstrap your debian directory
└── chroot-enter.sh      # utility script to execute commands in your debian rootfs

We will need the static qemu-aarch64 binaries if we're cross-building, since we need to execute Debian install scripts on our native host archivecture (e.g., x86_64).

First, make sure you have these packages installed (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!