On Wed, 23 Jun 2010, stephane duverger wrote: > On Tue, 22 Jun 2010 17:03:24 -0400 (EDT) > Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > > > I don't remember the details about how the Netchip debug device > > works. Does it simply copy bytes from one port over to the other? At > > any rate, the EHCI spec doesn't say anything about how a debug device > > has to work; it only says how the debug port itself works. That port > > is theoretically capable of handling any high-speed device, subject > > to its length limitation (no packet can be longer than 8 bytes). > > > > Is that limitation the reason a special gadget driver is needed? > > There is a Debug Device Specification by Intel: > > http://www.intel.com/technology/usb/download/DebugDeviceSpec_R090.pdf > > I think it has nothing to do with Netchip. Maybe it can justify the > need for an emulation. As Greg said, we need to be able to answer > specific requests from the ECHI Debug Port. Thanks, I wasn't aware of this document. It does specify two items that the debug device must support: the debug descriptor and the DEBUG_MODE feature. Would it be easier to add these to g_serial (selectable by a module parameter) than to create a whole new gadget driver? Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
