It turns out that a ROM-based serial upload with Folie takes about 22 seconds for a standard Embello install (Mecrisp + always/board/core). While this is fine for occasional re-flashing, it adds quite a delay for production, i.e. when an image needs to be loaded onto each new board.
But the STM32L05x series µCs has another trick up its sleeve:
The ROM boot loader also checks for SPI requests on pins PA4.
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