Damien George fae9205594 stm32/boards/LEGO_HUB_NO6: Add support for mboot to access SPI flash.
The following changes are made:
- Use software SPI for external SPI flash access when building mboot.
- Enable the mboot filesystem-loading feature, with FAT FS support.
- Increase the frequency of the CPU when in mboot to 96MHz, to increase the
  speed of SPI flash accesses and programming.

Signed-off-by: Damien George <damien@micropython.org>
2022-06-02 14:30:51 +10:00
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