The ohci driver is a USBA (Solaris USB Architecture) compliant nexus driver that supports the Open Host Controller Interface Specification 1.0a, an industry standard developed by Compaq, Microsoft, and National Semiconductor.

The ohci driver supports bulk, interrupt, control and isochronous transfers.

/kernel/drv/ohci

32 bit ELF kernel module for original USBA framework*

/kernel/drv/sparcv9/ohci

64 bit ELF kernel module for original USBA framework*

/kernel/drv/usba10_ohci

32 bit ELF kernel module for USBA 1.0 framework*

/kernel/drv/sparcv9/usba10_ohci

64 bit ELF kernel module for USBA 1.0 framework*

* Please see www.sun.com/desktop/whitepapers.html for more information regarding USB dual framework implementation, USBA 1.0, and USB 2.0.

See attributes(5) for descriptions of the following attributes:

attributes(5), ehci(7D), hubd(7D), usba(7D)

Writing Device Drivers

Universal Serial Bus Specification 2.0

Open Host Controller Interface Specification for USB 1.0a

System Administration Guide: Basic Administration

http://www.sun.com/desktop/whitepapers.html

http://www.sun.com/io

All host controller errors are passed to the client drivers. Root hub errors are documented in hubd(7D).

In addition to being logged, the following messages may appear on the system console. All messages are formatted in the following manner:

WARNING: <device path> (ohci<instance number>): Error message...

or

WARNING: <device path> (usba10_ohci<instance number>): 
Error message...

Unrecoverable USB Hardware Error.

There was an unrecoverable USB hardware error reported by the OHCI Controller. Please reboot the system. If this problem persists, contact your system vendor.

No SOF interrupts.

The USB hardware is not generating Start Of Frame interrupts. Please reboot the system. If this problem persists, contact your system vendor.