Wii Hardware/USB

The Wii features 3 USB Host Controllers:

• 1x "EHCI" USB 2.0 controller, managing the 2 user-accessible ports on the back of the console.
• 2x "OHCI" USB 1.1 controllers, 1 managing the internal Broadcom 2045A Bluetooth chipset, and the other handling when legacy devices are plugged into the 2 back ports.

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.