tl;dr

  • kw to develop and build a custom Linux kernel.
  • IIO Linux kernel tree.
  • Linux kernel compilation.
  • Booting the custom Linux kernel.

Commands

kw ssh # initiate an SSH connection to the default remote
cd "$IIO_TREE" # go to the IIO tree directory
kw build --menu # safely modify `.config` w/ a TUI
kw build # compile Linux kernel from source considering local configurations
kw deploy --modules # only install modules into the VM

Notes

In this class I’ve installed the kw tool to build and boot a custom Linux kernel. The IIO (Industrial I/O subsystem) Linux kernel tree was also cloned and built.

The resulting setup for this class was:

/home
├── lk_dev
│   ├── iio
│   ├── kw
│   ├── shared_arm64
│   └── vm
│       ├── arm64_boot
│       │   ├── initrd.img-6.1.0-43-arm64
│       │   └── vmlinuz-6.1.0-43-arm64
│       ├── arm64_img.qcow2
│       └── base_arm64_img.qcow2
└── pietro
    └── github
        └── open-source-development
            └── lk_dev
                └── activate.sh

📝 kw can update itself using the self-update command.

kw self-update # update with master branch
kw self-update --unstable # update with unstable branch.

⚠️ When a new VM is launched with virsh, update the IP addess in kw configuration.

sudo virsh net-dhcp-leases default
cd "$IIO_TREE"
kw remote --add arm64 root@<VM-IP-address> --set-default

The kw ssh --get '~/vm_mod_list' command didn’t work for me, so I had to use scp root@<VM-IP-address>:~/vm_mod_list .

Sometimes, sudo virsh shutdown arm64 doesn’t work. In these cases I have to force it with sudo virsh destroy arm64

Reference

Building and booting a custom Linux kernel for ARM using kw