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+23-Aug-2002
+
+The "ohci-hcd" driver is a USB Host Controller Driver (HCD) that is derived
+from the "usb-ohci" driver from the 2.4 kernel series.  The "usb-ohci" code
+was written primarily by Roman Weissgaerber <weissg@vienna.at> but with
+contributions from many others (read its copyright/licencing header).
+
+It supports the "Open Host Controller Interface" (OHCI), which standardizes
+hardware register protocols used to talk to USB 1.1 host controllers.  As
+compared to the earlier "Universal Host Controller Interface" (UHCI) from
+Intel, it pushes more intelligence into the hardware.  USB 1.1 controllers
+from vendors other than Intel and VIA generally use OHCI.
+
+Changes since the 2.4 kernel include
+
+        - improved robustness; bugfixes; and less overhead
+        - supports the updated and simplified usbcore APIs
+        - interrupt transfers can be larger, and can be queued
+        - less code, by using the upper level "hcd" framework
+        - supports some non-PCI implementations of OHCI
+        - ... more
+
+The "ohci-hcd" driver handles all USB 1.1 transfer types.  Transfers of all
+types can be queued.  That was also true in "usb-ohci", except for interrupt
+transfers.  Previously, using periods of one frame would risk data loss due
+to overhead in IRQ processing.  When interrupt transfers are queued, those
+risks can be minimized by making sure the hardware always has transfers to
+work on while the OS is getting around to the relevant IRQ processing.
+
+- David Brownell
+  <dbrownell@users.sourceforge.net>
+