Re: how to debug a USB problem?

[Brett Lymn <brett.lymn%baesystems.com@localhost>]

On Wed, Dec 07, 2011 at 01:04:02PM +0400, Aleksej Saushev wrote:
> 
> Build kernel with USB_DEBUG and check kernel messages?
> 
> 

and OHCI_DEBUG and EHCI_DEBUG, then set the variables usbdebug,
ohcidebug and ehcidebug to 1 using DDB (just in case someone else needs
to know wtf to do).

It looks like EHCI just hangs:

Dec  9 08:19:50 rover /netbsd: ehci_pcd: change=0x02
Dec  9 08:19:50 rover /netbsd: ehci_pcd: change=0x02
Dec  9 08:19:51 rover /netbsd: ehci after reset, status=0x00001100
Dec  9 08:19:51 rover /netbsd: ehci0: port reset timeout
Dec  9 08:19:51 rover /netbsd: usbd_do_request_flags_pipe: returning
err=TIMEOUT
Dec  9 08:19:51 rover /netbsd: uhub2: port 1 reset failed

OHCI seems a lot better behaved.  I think the problem with the BBB reset
was more that my mp3 player was upset by the connection to the EHCI
port.  Normally what I would do is try one usb port and then just try
the next one.  When I actually reset the mp3 player and tried a OHCI
port the device attached and I could mount it.  I have copied some files
and it seems fine.

-- 
Brett Lymn
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