Date: Tue, 6 Nov 2007 13:58:53 +0100 From: Bernd Walter <ticso@cicely12.cicely.de> To: Krassimir Slavchev <krassi@bulinfo.net> Cc: freebsd-arm@freebsd.org Subject: Re: Detecting USB devices at startup? Message-ID: <20071106125853.GJ4593@cicely12.cicely.de> In-Reply-To: <47303B8E.2040403@bulinfo.net> References: <472F1A97.3090308@bulinfo.net> <20071105.080609.1723237322.imp@bsdimp.com> <47303B8E.2040403@bulinfo.net>
next in thread | previous in thread | raw e-mail | index | archive | help
On Tue, Nov 06, 2007 at 12:01:50PM +0200, Krassimir Slavchev wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Hi, > > M. Warner Losh wrote: > > In message: <472F1A97.3090308@bulinfo.net> > > Krassimir Slavchev <krassi@bulinfo.net> writes: > > : At boot I get: > > ::: doesn't > > : But if I unplug and plug the usb device: > > ::: works > > : Any ideas why this happens? > > : PS1: I have this problem with all USB devices I tested. > > > > This may be a power issue. I've been running a KB2902A for months > > with -current with various types of ucom devices that are seen at > > boot without the hotplug. > > > > Maybe you can try adding a powered hub and seeing if that helps. > > > > Warner > > > > Yes, It looks like a power issue but the power supply used in the > development board is very good designed (LM2576 is used). I will measure > power line again. Also the PWM frequency might interfere with PLL. > I will try to find powered hub to make tests. All usb hubs on the market > are bus-powered :( I can ensure you: there are self powered hubs. If in doubt buy a seven port, they can't work bus powered. Is the LM2576 really used for USB? This is a very beefy thing just for a single port and everything else in a AT91RM9200 system is running at 3,3V or lower. On my board I use such a 257x regulator for 3,3V, separate linear regulators from 3,3V to supply the 1.8V for core and switch and another linear regulator directly from input for 5V to USB. -- B.Walter http://www.bwct.de http://www.fizon.de bernd@bwct.de info@bwct.de support@fizon.de
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20071106125853.GJ4593>