Date: Wed, 07 Nov 2007 14:55:54 +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: <4731B5DA.6040204@bulinfo.net> In-Reply-To: <20071106134227.GK4593@cicely12.cicely.de> References: <472F1A97.3090308@bulinfo.net> <20071105.080609.1723237322.imp@bsdimp.com> <47303B8E.2040403@bulinfo.net> <20071106125853.GJ4593@cicely12.cicely.de> <47306BDD.70206@bulinfo.net> <20071106134227.GK4593@cicely12.cicely.de>
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi, I have connected a powered hub but: ... uhub1: <vendor 0x05e3 USB2.0 Hub, class 9/0, rev 2.00/7.02, addr 2> on uhub0 usbd_get_config_desc: confidx=0, bad desc len=9 type=0 device_attach: uhub1 attach returned 6 ... usbdevs -vd: Controller /dev/usb0: addr 1: full speed, self powered, config 1, OHCI root hub(0x0000), Atmel(0x0000), rev 1.00 uhub0 port 1 addr 2: full speed, power 500 mA, unconfigured, USB2.0 Hub(0x0606), vendor 0x05e3(0x05e3), rev 7.02 port 2 powered I have measured 3.3V and 5V power lines and they are OK. Pulsations are under 50mV. Also the main oscillator frequency is 9.999550 MHz. Is there any other things which may affect the USB functionality? Best Regards Bernd Walter wrote: > On Tue, Nov 06, 2007 at 03:27:57PM +0200, Krassimir Slavchev wrote: >> Bernd Walter wrote: >>> On Tue, Nov 06, 2007 at 12:01:50PM +0200, Krassimir Slavchev wrote: >>>> 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. > > I'm still a bit surprised, since there are so many noname hubs with > fat wallwarts. > >>> 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. > > Interesting, so they run everything linear regulated from 5V. > Sounds like a lot of power loss, but their board is different and > maybe they have more 5V components. > My board only needs 5V for USB, so I never saw the need for efficient > 5V and prefered efficient 3,3V, which is also quite loaded from the > switch. > -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (FreeBSD) iD8DBQFHMbXZxJBWvpalMpkRAvT2AJ0Rz1kFkOZLEGp9+plCaexiN1lMvwCguASt D75cxaucZB9jquPdQE39Y5M= =7OCO -----END PGP SIGNATURE-----
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