The wiki is being retired!
Documentation is now handled by the same processes we use for code: Add something to the Documentation/ directory in the coreboot repo, and it will be rendered to https://doc.coreboot.org/. Contributions welcome!
To build a coreboot image that contains a small Linux system in flash (this setup is also know as LAB — Linux as BIOS) you can simply point to the bzImage as your payload (x86 only). The buildrom utility can help you download and compile all required components.