RaspberryPi SDIO
- BCM2835 ha two sdhost controllers.
- 1 sdhci : Arasan sdhci controller (SD / SDIO)
- 2 sdhost : custom sdhost controller (SD only, but better performance)
- RPi1 use sdhci for SD slot.
- RPi3 use sdhost for SD slot. RPi3 use sdhci for Wi-Fi.