When you use boot -c, it runs the UKC interactive utility *before* scanning for devices on your hardware. Changes are to the kernel's standard configuration of drivers, and it is similar to using # config -o /test.bsd -e /bsd, followed by booting the test kernel.
My workstation has an azalia driver active, but only one, so I'm not going to be able to test a kernel on running hardware with two azalia peripherals.
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