prtvtoc /dev/rdsk/${Primary_disk}s2 | fmthard -s - /dev/rdsk/${Secondary_disk}s2

/sbin/installgrub -fm /boot/grub/stage1 /boot/grub/stage2 /dev/rdsk/${Secondary_disk}s0

# ls -la /dev/dsk/c#t#d#s#
This example was taken from an X2100 platform:

# ls -la /dev/dsk/c2d0s0
lrwxrwxrwx 1 root root 48 Sep 5 21:35 /dev/dsk/c2d0s0 -> ../../devices/pci@0,0/pci-ide@7/ide@1/cmdk@0,0:a
so the path that needs to added to the bootenv.rc file is eeprom

ls -la /dev/dsk/${Secondary_disk}s0

# eeprom altbootpath=”/pci-ide@7/ide@1/cmdk@0,0:a”

# fdisk -b /usr/lib/fs/ufs/mboot /dev/rdsk/c1t1d0p0

    The following screen appears:

                 Total disk size is 31035 cylinders
                 Cylinder size is 1146 (512 byte) blocks

                                                   Cylinders
          Partition   Status    Type          Start   End   Length    %
          =========   ======    ============  =====   ===   ======   ===
              1        Active   Solaris           1  31034    31034    100


    SELECT ONE OF THE FOLLOWING:
       1. Create a partition
       2. Specify the active partition
       3. Delete a partition
       4. Change between Solaris and Solaris2 Partition IDs
       5. Exit (update disk configuration and exit)
       6. Cancel (exit without updating disk configuration)
    Enter Selection: 5

title alternate boot
 root (hd1,0,a)
 kernel /boot/multiboot
 module /boot/x86.miniroot-safe