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From: Hans Petter Selasky <hselasky@c2i.net>
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Subject: Re: uslcom drops chars(?) when used with hub
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On Tuesday 23 March 2010 19:44:55 Steve Franks wrote:
> After my last 8-stable buildworld, I can't upgrade firmware on uslcom
> devices plugged into a hub.  I can still talk to them over a terminal,
> but it seems anything that slams bits at them 'fast' dies an early
> death.  Works fine in motherboard usb slot, however.  Also, had
> identical hub that's rarely ever used, which has same behavior, so all
> things point to an OS/quirks type issue.
> 
> How do I even begin debugging this?  This is a major problem for my
> day to day workflow.  I do *a lot* of firmware upgrades.

Hi,

You can try:

sysctl hw.usb.uslcom.debug=15

What does usbconfig say about your device when you use the HUB and without 
HUB?

Also check the version history for /sys/dev/usb/serial/uslcom.c at 
freebsd.org.

--HPS