ESP32 devkitC spi problem with microsd card reader

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Wilberforce
The default firmware for the ESP32 is setup to use an FAT files system on the last 1 Mb of the flash memory. To use and SPI SD card, you would need to do a custom build of the firmware, and turn of the FlashFS option. You can use SPI for other devices with the stock firmware

https://github.com/espruino/Espruino/blob/master/boards/ESP32.py#L35
```
      'FILESYSTEM',
     'FLASHFS'     
   ],
```
Would need to be changed to:
```
     'FILESYSTEM',
#     'FLASHFS'     
   ],
```
and the firmware rebuilt. Then an external SD card could be used.

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