His solution? The Raspberry Pi series of chips has a special function on a bunch of the GPIO pins that make it easier to talk to SDIO devices. SDIO is an extension of the SPI-like protocol that ...
The SDIO 3.0 Device Controller is fully compliant with the SD Specification Part E1 SDIO 3.0. The SDIO 3.0 Device IP is used to implement high-performance SDIO cards that connect to a Host processor ...