Damien George 763bd448a4 stm32/mboot: Don't search for firmware on FS, just attempt to open it.
There's no need to do a directory listing to search for the given firmware
filename, it just takes extra time and code size.  Instead this commit
changes it so that the requested firmware file is opened immediately and
will abort if the file couldn't be opened.  This also allows to specify
files in a directory.

Signed-off-by: Damien George <damien@micropython.org>
2020-06-26 21:11:03 +10:00
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