From owner-freebsd-hackers  Fri Sep 19 17:50:44 1997
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Date: Fri, 19 Sep 1997 17:50:37 -0700 (PDT)
From: Jaye Mathisen  <mrcpu@cdsnet.net>
To: hackers@freebsd.org
Subject: Is there a way to prompt for boot device?
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ie, my kernel might have sd8 as the root device, but for other reasons,
when I boot, I might want sd0 as the root device.

I thought the -r or -a options would do it, but that's not quite what I
expected.