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From: Tom Vijlbrief <tvijlbrief@gmail.com>
Date: Tue, 07 Jun 2016 05:41:38 +0000
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Subject: Re: Root on USB stick
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Op ma 6 jun. 2016 08:33 schreef Lou Katz <pi@metron.com>:

> Where does the FreeBSD boot loader for Pi2 know about or find out
> where the root partition is? I need to boot from an image in the
> micro slot that I cannot remove (because I broke the push-pull mechanism)
> but use a root parition on another card accessed through a USB port.
>
> There seems to have been a way to do this with FreeBSD 10, but I cannot
> find it in FreeBSD 11.
>

My

/boot/loader.conf

(on the sd-card root) has

vfs.root.mountfrom="ufs:/dev/ufs/bsd11"

to boot from an attached usb stick.

You could use eg /dev/da1s1a instead of a UFS label.