To check whether you are running in 64bit or 32bit run isainfo -b
Booting the 32-bit
Kernel
Logged in as root, open a terminal window and type in the following:
# su -
# cd /
# halt -y
The machine will result in something similar to this:
syncing file systems...
done
Program terminated
{2} ok
At this "ok" prompt type in the following:
{2} ok boot kadb -D
kernel/unix
The machine will reboot at this point. Login as root after the reboot. Open up a
terminal window and type in the following:
# su -
# cd /
# eeprom boot-file=kernel/unix
# reboot
Now at this point, the Solaris 8 machine will be booting the 32 bit kernel by default.
Booting the 64-bit
Kernel
To change back to the 64 bit kernel, perform the following operations.
# su -
# cd /
# halt -y
The machine will result in something similar to this:
syncing file systems...
done
Program terminated
{2} ok
At this "ok" prompt type in the following:
{2} ok boot kadb -D
kernel/sparcv9/unix
The machine will reboot at this point. Login as root after the reboot. Open up a
terminal window and type in the following:
# su -
# cd /
# eeprom boot-file=kernel/sparcv9/unix
# reboot
Now at this point, the Solaris 8 machine will be booting the 64 bit kernel by default.