chenjianqiang a159e58ead feature(psram): add psram support for esp32-pico chip
1. esp32-pico use standard spi driver to access psram
2. for esp32-pico, flash and psram share the clock
3. for esp32-pico, psram cs io can be overwrite via menuconfig
2019-02-13 14:27:44 +08:00
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