Date: Tue, 06 Nov 2007 15:27:57 +0200 From: Krassimir Slavchev <krassi@bulinfo.net> To: ticso@cicely.de Cc: freebsd-arm@freebsd.org Subject: Re: Detecting USB devices at startup? Message-ID: <47306BDD.70206@bulinfo.net> In-Reply-To: <20071106125853.GJ4593@cicely12.cicely.de> References: <472F1A97.3090308@bulinfo.net> <20071105.080609.1723237322.imp@bsdimp.com> <47303B8E.2040403@bulinfo.net> <20071106125853.GJ4593@cicely12.cicely.de>
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Bernd Walter wrote: > 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. Ok, I will look for bigger hub. > > Is the LM2576 really used for USB? http://www.harerod.de/centipad/documents/CentiBOB201psk_color.pdf Look at sheet 2. > 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. There is another voltage regulator TPS767D301. http://www.harerod.de/centipad/documents/CentiPad_Programmers_Model_205.pdf Look at sheet 13. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (FreeBSD) iD8DBQFHMGvdxJBWvpalMpkRAgs1AKClofg7OfxWE/qgzgUHkM/sDQCW6QCfVbMZ BCKvVDIZGVo79D2+TNC3+H0= =paY8 -----END PGP SIGNATURE-----
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