Building a custom Linux image. It covers toolchain setup, u-boot config, kernel customization, and BusyBox rootfs creation, including setting the init process.
This endeavor provides an extensive guide and script collection for crafting an embedded Linux system from scratch. Following these steps offers a comprehensive understanding of each element and the holistic process of tailoring a custom Linux distribution for embedded platforms.
Utilizing Crosstool-NG, we construct cross-compilation toolchains tailored to our precise specifications, facilitating efficient software compilation for our target architecture.
U-Boot serves as a prominent bootloader in embedded systems, enabling functionalities like Linux kernel booting, hardware initialization, and debug console provision.
At the core of Linux-based OSes, the Linux kernel undergoes compilation suited to our target hardware, bespoke configuration, and Device Tree Blobs (DTB) generation for hardware abstraction.
BusyBox amalgamates Unix utilities into a singular executable, furnishing essential commands akin to standard Linux distributions, albeit optimized for resource-constrained environments.
Initiating the user-space journey during Linux system boot, a minimalist init process orchestrates vital system initialization tasks, encompassing filesystem mounting, system service initiation, and shell invocation.