stm32: Add MICROPY_HW_SPIFLASH_ENABLE_CACHE option to eliminate need for 4k SPI cache when not used #6704
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When littlefs is enabled extended reading must be supported, and using this function to read the first block for auto-detection is more efficient (a smaller read) and does not require a cached SPI-flash read. Signed-off-by: Damien George <damien@micropython.org>
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>
Mboot builds do not use the external SPI flash in caching mode, and explicitly disabling it saves RAM and a small bit of flash. Signed-off-by: Damien George <damien@micropython.org>
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