Build and Boot the Latest Linux Kernel in QEMU with BusyBox (One Script)
Compiling the latest mainline Linux kernel and actually booting it sounds intimidating — but with one Bash script, you can go from a clean Ubuntu 22.04 machine to a freshly built kernel running safely inside QEMU, with zero risk to your host system.
In this video, I walk through a single automated script that:
00:00 Installing the build dependencies (gcc, libssl, libelf, flex, bison, QEMU)
00:54 Cloning and compiling the latest mainline kernel from torvalds/linux
24:17 Building BusyBox — a minimal static userland
26:22 Assembling a BusyBox initramfs
26:46 Booting the kernel in QEMU
27:05 Wrap-up and what's next
For the userland, we use BusyBox packed into an initramfs, a single tiny static binary that gives the kernel a working shell. It's the fastest way to verify a kernel boots before moving to a full persistent root filesystem, which I'll cover in a follow-up video.
This is the same fundamental workflow kernel developers use to test changes safely — fast, disposable, and fully isolated from your real machine.
Read the full written walkthrough with all commands on Medium:
https://medium.com/@m.abubakar365/how-to-b...
If this helped, leave a like, subscribe for more embedded systems and Linux kernel content, and stay tuned for Part 2: booting this same kernel with a full Debian/Ubuntu rootfs via debootstrap.
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