Damien George c169094f61 stm32/storage: Make pyb.Flash configurable, and support ext block proto.
The pyb.Flash() class can now be used to construct objects which reference
sections of the flash storage, starting at a certain offset and going for a
certain length.  Such objects also support the extended block protocol.
The signature for the constructor is: pyb.Flash(start=-1, len=-1).
2019-11-26 00:07:09 +11:00
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