On Wed, 23 Jun 2010 10:14:59 -0400 (EDT) Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > 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. Yes, that's why the code base of this new gadget is so small and is only a glue between gadget api and "u_serial". Nothing more than init code and a switch case :) > Would it be easier to add these to g_serial (selectable by a module > parameter) than to create a whole new gadget driver? I don't think so, but i can try. I'm currently trying to port the gadget code to 2.6.35-rc3. I can try you approach at the same time. I will recontact this mailing list in a while. Thanks for you attention. PS: i recently bought an IGEPv2 board. The most recent git they provide is 2.6.35-rc1. The mainlinevanilla 2.6.35-rc3 stephane -- 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
