[coreboot] Rebuilding coreboot image generation

[Patrick Georgi]

Hey coreboot folks,

I'm looking for an approach to make building Chrome OS style coreboot
images easier to do with regular coreboot tools, instead of the rather
large post-processing pipeline we have in the Chrome OS build system.

The rationale is that we also push the Chrome OS capabilities (eg.
verified boot) upstream, and actually using them shouldn't depend on
checking out yet another custom build environment.

I wrote a proposal on how to do that, which can be found and commented
at https://docs.google.com/document/d/1o2bFl5HCHDFPccQsOwa-75A8TWojjFiGK3r0yeIc7Vo/edit

If this is to be implemented, I'd do that as part of coreboot's build
system, and work on supporting the regular image types (with a
"simple" bootblock and a fallback/normal switch configuration) we
currently have.

I appreciate comments and concerns how this fits in with other use cases.


Thanks,
Patrick
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