System Administration Guide, Volume I

Do I Boot Systems Running a 32-bit and 64-bit Solaris 7 Kernel the Same Way?

No, but you shouldn't have to boot them differently. The 64-bit Solaris 7 kernel is booted by default if it is installed on an UltraSPARC system. If it isn't installed, the 32-bit kernel is booted instead.

Also, on UltraSPARC systems, kadb and various boot programs are now 64-bit programs that can boot either a 32-bit or 64-bit kernel.

If you have problems booting either system type, see the next section.