Use software bit-banging for PSRAM. Run from RAM.

tvlad1234 / pico-rv32ima

Running Linux on RP2040 with the help of RISC-V emulation

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Use software bit-banging for PSRAM. Run from RAM. #5

Closed tvlad1234 closed 1 year ago

tvlad1234 commented 1 year ago

The PIO SPI won't run faster than 40MHz for some reason. Bit-banged SPI is faster than the PIO implementation at 400MHz system clock. Also, running the ARM code from RAM is faster than running from the QSPI flash.