> So by default if you want to build for HD-8570M, you change in .config (6665 
> ---> 6663) and you simply complete your build?

Yes, and indeed it could be said that "make menuconfig" is "only a GUI
for the .config". If you'd like, you could avoid running it - as long
as your manual changes to .config are still compatible with Kconfigs
of coreboot source tree (Kconfigs are determining the default values
and dependencies of many configuration options) - and if your desired
.coreboot configuration is the same as this one which I provided as an
example. "6665 ---> 6663" change is very simple - so could be done
manually - however for the bigger changes it is more convenient to use
a GUI menu, since you may forget about some dependencies and if any of
your .config options are in conflict with Kconfigs, these .config
options will be reset during a build (there will be a message at the
beginning of build but you could skip it accidentally) and there will
be a problem. "GUI menu" also helps you to learn more about the
coreboot options, you could press a question sign on any of them and
get a small useful README.

> So if you make a snapshot after applying the patches, you can then change the 
> .config to your preferences and make a build and do that again if you need 
> another build, correct?

Yes, but such a simple switch is possible only if you are building for
the same board. If you'd like to build for a different board, you'd
also need to run a "make clean" to clean the compiled files, and maybe
even "make distclean" if there are any problems. Perhaps it's better
to keep the separate coreboot directories for the different boards.

> You would use the cbfstool only if you make a snapshot after you already 
> built and then want to change the dgpu, correct?

Not to change the dGPU but rather to add the AtomBIOS for a different
one - since the AtomBIOS for another dGPU will still be inside your
CBFS (Coreboot ROM's FileSystem), so both dGPUs will be supported -
unless you'd remove another AtomBIOS, which is already there, manually
(with cbfstool). Also, you could use the cbfstool to add a
floppy-based operating system - such as KolibriOS - or simply to print
a memory map of your coreboot.rom to see how much of a free space
there's left.

Best regards,
Mike Banon
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