Re: ehci problem on OMAP35xx

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On Wed, Apr 15, 2009 at 9:34 PM, twebb <taliaferro62@xxxxxxxxx> wrote:
> I'm having issues getting USB up and going on HSUSB2/EHCI on
> OMAP35xx-based hardware (very similar to beagle board).  We're using
> an SMSC3317 connected to HSUSB2, and in turn, the 3317 is connected to
> an onboard hub - a SMSC USB2513.  When the hub is removed from reset,
> it appears that handshaking/chirping starts to happen between xcvr and
> hub, but ends with the code announcing that it is "unable to enumerate
> USB device on port 2".  I'm guessing it's failing because we never see
> PED set in the PORTSC_1 reg (and we are seeing PO=1 which doesn't make
> any sense).

Is the driver chirping properly? Is it identifying the speed properly?
I had a similar problem. Please check the D+ and D- line for loading.
I used SMSC3320 which also had similar problems because of
ESD protection thermistors placed in the board.


> I'm running a l-o git-based 2.6.28-omap1 kernel with
> omap3_beagle_defconfig.  Beagle board works fine (with patch to
> ehci-omap.c and with CONFIG_USB_EHCI_HCD turned on), but my hardware
> (with virtually same xcvr and and onboard hub) does not.
>
> Kind of new to this low level USB functionality, so a few questions...
> 1.  Any ideas why we'd see PORTSC_1[PO] = 1?
> 2.  Any suggestions on debugging basic connectivity between 35xx EHCI
> controller and transceiver + hub?
>
> Thanks,
> twebb
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