Damien George e43a74a4db drivers/memory/spiflash: Add MICROPY_HW_SPIFLASH_ENABLE_CACHE option.
This only needs to be enabled if a board uses FAT FS on external SPI flash.
When disabled (and using external SPI flash) 4k of RAM can be saved.

Signed-off-by: Damien George <damien@micropython.org>
2020-12-18 13:39:32 +11:00
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