I'm a lurker here (keep up the great work everyone! <3), but I saw this and thought it looked relevant to coreboot development that a link should be posted.
Quoting from the website:
The Intel BIOS Implementation Test Suite (BITS) provides a bootable pre-OS environment for testing BIOSes and in particular their initialization of Intel processors, hardware, and technologies. BITS can verify your BIOS against many Intel recommendations. In addition, BITS includes Intel's official reference code as provided to BIOS, which you can use to override your BIOS's hardware initialization with a known-good configuration, and then boot an OS.
I haven't looked into it deeply enough and nor have I used coreboot enough to know if it will be helpful, but I certainly hope it will.