gnuboot/resources/coreboot/README.debug

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GNU Boot also builds some debug images that are shipped in separate
debug archives (like gnuboot-0.1-rc3_x200_8mb_debug.tar.xz).
The debug images have the following differences with the regular
images:
- The serial port is enabled, its speed is set to 115200, and the
Coreboot debug level is set to 7. It's possible to bring it up to 8
without recompiling the image by modifying the cmos.default file
inside the image. In addition POST codes are also printed on the
serial port.
- When the computer has a Coreboot build setting for that (all
computers but QEMU have that), memory debugging is enabled. This can
help diagnose RAM compatibility issues to potentially fix them in
Coreboot.