Re: USB Interrupt Transfer limited to 1 packet?
Alan Stern <[email protected]>
| Newsgroups | gmane.linux.usb.devel |
|---|---|
| Message-ID | <[email protected]> |
On Thu, 1 Feb 2007, Florin Iucha wrote: > > > I have read the Intel 82801E manual (this is the chipset that I am > > > using) and the USB 2.0 spec (section 8.5.4 in particular, in contrast > > > to 8.5.2) but I did not find a hard reference to this limitation of a > > > single data packet per interrupt transfer. Do you have a hard > > > reference to this limitation and can you send me a link or a > > > document/section number? > > > > It isn't a hardware limitation; it's a software driver limitation. So you > > won't find it in any hardware manuals. > > Does that mean that I can just remove the check and everything should > work? No. I mean that the 2.6 driver is written in such a way that the check isn't needed -- but I don't know if the same is true for the 2.4 driver. You can try it and see. > Do you know if there is anything that assumes the check > upstream and might break if removed? You mean, code that relies on getting an error from usb_uhci? I don't think people write drivers like that. They prefer to avoid errors. Alan Stern ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier. Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel