To determine computer/OS is 64 bit or 32 bit:
isainfo -bTo switch from 64-bit mode to 32-bit mode:
isainfo -kv
Press 'e' in grub menu while computer booting up, edit the default line
kernel /platform/i86pc/multibootchange to
kernel /platform/i86pc/multiboot kernel/unixOr edit /boot/grub/menu.lst to add a permanet entry.
Alternative method:
set related variable "boot-file" in eeprom after enter ok prompt mode (sparc) or edit /boot/solaris/bootenv.rc (x86) and add a line:
setprop boot-file kernel/unix
Update on Oct. 26, 2005: Another method:
reboot -- -D kernel/unix