From the bootloader, you can't issue shell commands, but ... you can find out what's on the three hard drives it sees.
boot> ls hd0a:/
boot> ls hd1a:/
boot> ls hd2a:/
Then, once you've figured out which disk to boot from, issue:
boot> boot hd_a:/bsd
The bootloader will only try to boot from drive #0 unless told otherwise.
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