The sparc64 architecture has an equivalent capability:
Quote:
The UltraSPARC Open Firmware will normally look for a bootloader on the
device specified by the boot-device variable. The OpenBSD bootloader
will then look for a kernel named bsd by default, unless the boot-file
variable is set, or a different filename has been specified in the boot
command. To reset this variable to its default, empty, value, type the
following:
ok set-default boot-file
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Ref: boot_sparc64(8).