Damien George d4b45898f5 stm32/mboot: After sig verify, only write firmware-head if latter valid.
So that mboot can be used to program encrypted/signed firmware to regions
of flash that are not the main application, eg that are the filesystem.

Signed-off-by: Damien George <damien@micropython.org>
2021-02-18 13:59:03 +11:00
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