Date: Tue, 06 Nov 2007 12:01:50 +0200 From: Krassimir Slavchev <krassi@bulinfo.net> To: "M. Warner Losh" <imp@bsdimp.com> Cc: freebsd-arm@freebsd.org Subject: Re: Detecting USB devices at startup? Message-ID: <47303B8E.2040403@bulinfo.net> In-Reply-To: <20071105.080609.1723237322.imp@bsdimp.com> References: <472F1A97.3090308@bulinfo.net> <20071105.080609.1723237322.imp@bsdimp.com>
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-----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 :( -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (FreeBSD) iD8DBQFHMDuOxJBWvpalMpkRAv/mAJ9wDk8AIWDs2FQ3Ee1niGMGbukZjACfY+ks CCqZ7U/2J0M3Hqu55PgMGVg= =lnWx -----END PGP SIGNATURE-----
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