From owner-freebsd-questions@FreeBSD.ORG  Wed Dec  1 05:20:39 2010
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Date: Wed, 1 Dec 2010 00:19:54 -0500
Message-ID: <AANLkTi=WWCVD9JG4=G9C0rS4F3JbdoZFjWNkqRiSK_Vq@mail.gmail.com>
From: Carl Chave <carl@chave.us>
To: FreeBSD Questions <freebsd-questions@freebsd.org>
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Subject: Re: GPT/ZFS/USB mountroot prompt
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On Wed, Dec 1, 2010 at 12:07 AM, Carl Chave <carl@chave.us> wrote:
> I followed a gpt/zfs on USB stick guide for putting a base 8.1-RELEASE
> amd64 onto a 4GB sandisk USB memory stick. =A0All went fairly well and
> the system will boot but fails to mount the root file system and dumps
> me a the mountroot> prompt. =A0Entering zfs:zrootusb at the prompt works
> and the system finishes booting.
>
> In /boot/loader.conf I've got:
> zfs_load=3D"YES"
> vfs.root.mountfrom=3D"zfs:zrootusb"
>
> zrootusb mountpoint is set to legacy and /etc/fstab exists but is
> empty, per the guide.
>
> Any ideas?
>
> Thanks,
> Carl
>

adding

kern.cam.boot_delay=3D10000

to /boot/loader.conf seems to have fixed it.