Tutorial: Building the Simplest Possible Linux System
Talkat Embedded Linux Conference + OpenIoT Summit North America 2017 · on Wednesday, 2017-02-22· at 16:20· Skyline II·
summary
Starts from the claim that you can boot the tiniest Linux by building a kernel and a tiny rootfs and shows the exact commands that make it work under QEMU emulation. Walks kernel config to the level of which CONFIG symbols to flip, uses initramfs cpio archives, objcopy and qemu -kernel, and a statically linked busybox/toybox root to avoid host leakage. Notes circular dependencies, the original seven-package bootstrap, a 6.2 MB kernel, and demonstrates a working PID 1 shell and hello world.
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chapters (14)
- 0:00Building a Linux system
- 1:08Circular dependencies in Linux builds
- 2:35Linux build environment components
- 6:36Booting hello world
- 15:53Simplest possible Linux system
- 17:48Minimal Linux kernel
- 21:02Root filesystem with initramfs
- 39:58BusyBox user space
- 52:50Cross-compiling challenges
- 1:07:11Statically linked BusyBox
- 1:17:50Init processes and setup
- 1:38:25Minimal root filesystem
- 1:44:10Kernel config with Mini-Config
- 1:53:47Finalizing the system
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