Re: PXA27x UDC Power
David Brownell <[email protected]>
| Newsgroups | gmane.linux.usb.devel |
|---|---|
| Message-ID | <[email protected]> |
On Wednesday 28 November 2007, Justin Clacherty wrote: > David Brownell wrote: > > I'm not sure I see it as a problem. At that level, power > > management is highly product-specific -- if you want anything > > other than very generic behavior. > > Good point :) Also, I just noticed the fixme for higher powered devices > in ether.c. > > > Plus, didn't you say you wanted multiple configurations ... a > > standard one, and a higher power one for battery recharging? > > We really only want the high powered one but I figured it should at > least talk if connected to an unpowered hub. Yes. > > You get connected to a host ... the host chooses a configuration > > it can support. > > I thought that was the case. My real concern was that I wasn't sure > multiple configurations worked properly on the pxa27x. ISTR the basic problems being (a) hardware limitiation to at most three configurations, (b) bugs preventing those three from working sanely, despite (c) changes between 25x and 27x. > The pxa27x > doesn't seem to like having RNDIS enabled and as far as I can recall it > is something to do with the strange way Intel implemented the > configurations. I may have misinterpreted the problem though. The basic strangeness is the hardware actually caring about configurations, rather than letting software handle *all* those issues. Once they decided to do that, they were hosed first by constraints in how they designed that hardware (mis)feature and then by bugs in how they implemented that design. - Dave > Justin. > ------------------------------------------------------------------------- SF.Net email is sponsored by: The Future of Linux Business White Paper from Novell. From the desktop to the data center, Linux is going mainstream. Let it simplify your IT future. http://altfarm.mediaplex.com/ad/ck/8857-50307-18918-4 _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel