From owner-freebsd-arm@FreeBSD.ORG  Mon Nov  5 15:08:39 2007
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Date: Mon, 05 Nov 2007 08:06:09 -0700 (MST)
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To: krassi@bulinfo.net
From: "M. Warner Losh" <imp@bsdimp.com>
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Cc: freebsd-arm@freebsd.org
Subject: Re: Detecting USB devices at startup?
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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