If the Ultra machine meets the hardware and software requirements for 64-bit boot, the boot-file variable must be set to kernel/unix. If not, then the machine will boot 64-bit. The boot-file variable can be set by either the Solaris eeprom command or the OBP setenv command. eeprom:

Login as root and use the eeprom command to set the boot-file parameter to the 32-bit kernel:

# /usr/sbin/eeprom boot-file="kernel/unix"

The next system reboot will boot the 32-bit kernel. setenv: From the system's OBP OK> prompt, use the setenv command to set the boot-file parameter to the 32-bit kernel:

OK> setenv boot-file kernel/unix

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