the prior version, for the board/user configs, took the whole ~2MB
binary file and converted it to a UF2, which made for a lot of chunks
that were just writing 0s, between the end of the firmware and the start
of the config(s). this changes the logic to build each portion as
separate UF2 chunks and then combine them.
Signed-off-by: Brian S. Stephan <bss@incorporeal.org>
Brian S. Stephan
8e6a203398
