Hardware/USB

The Wii and Wii U feature several EHCI and OCHI USB Host Controllers.

Port layout

Wii

• EHCI0: 4 root ports
  • Port 1: Leftmost port on back
  • Port 2: Rightmost port on back
  • Port 3: Internal BCM2045A Bluetooth card
  • Port 4: Disconnected
• OHCI0: 2 root ports
  • Port 1: Leftmost port on back
  • Port 2: Rightmost port on back
• OHCI1: 2 root ports
  • Port 1: Internal BCM2045A Bluetooth card
  • Port 2: Disconnected

Wii U

• EHCI0: 6 root ports
  • Port 1: Top port on back
  • Port 2: Bottom port on back
  • Port 3: Internal BCM2045A Bluetooth card
  • Port 4: Disconnected?
  • Port 5: (vWii) Leftmost port on front
  • Port 6: (vWii) Rightmost port on front
• EHCI1: 2 root ports
  • Port 1: (native) Leftmost port on front
  • Port 2: (native) Rightmost port on front
• EHCI2: 2 root ports
  • Port 1: DRH
  • Port 2: Disconnected
• OHCI0: 4 root ports
  • Port 1: Top port on back
  • Port 2: Bottom port on back
  • Port 3: (vWii) Leftmost port on front
  • Port 4: (vWii) Rightmost port on front
• OHCI1: 2 root ports
  • Port 1: Internal BCM2045A Bluetooth card
  • Port 2: Disconnected?
• OHCI2: 2 root ports
  • Port 1: (native) Leftmost port on front
  • Port 2: (native) Rightmost port on front
• OHCI3: 2 root ports
  • Port 1: ??
  • Port 2: ??

Wii-Linux has had support for USB since the beginning. gc-linux added support for it in MIKEp1, the first release. Support in versions between gc-linux and Techflash's 4.5 port used to have issues. USB hubs sometimes caused strange behavior, and sometimes the driver threw -EINVAL (error -22) when a device is inserted. USB support was greatly improved with mainline and should be more reliable than past versions.