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From: Gavin Atkinson <gavin@FreeBSD.org>
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Date: Tue, 29 Sep 2009 15:03:16 +0100
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Cc: "Andrey V. Elsukov" <bu7cher@yandex.ru>,
	FreeBSD Stable Mailing List <freebsd-stable@FreeBSD.org>
Subject: Re: Booting FreeBSD 8.0-RC1 from usb stick
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On Tue, 2009-09-29 at 14:40 +0200, Marius N=FCnnerich wrote:
> 2009/9/29 Andrey V. Elsukov <bu7cher@yandex.ru>:
> > Marius Nu"nnerich wrote:
> >>
> >> Explicitly setting the root partition
> >> (vfs.root.mountfrom=3D"ufs:/dev/da0s1a") in /boot/loader.conf does not
> >> help either: Again, the system knows which partition it should mount
> >> to "/", but it fails to do so. (vfs.root.mountfrom.options=3Drw was se=
t
> >> too).
> >
> > It's known problem and we are waiting for fix. There is a race between
> > USB and CAM/SCSI subsystems.
>=20
> OK, thank you! Is there a PR open for this?

I think your problem is probably usb/138798.

Gavin