INFODOC ID: 21434

SYNOPSIS: How to boot system into 64 bit mode or 32 bit mode.
DETAIL DESCRIPTION:
In some instances it is necessary to boot the system to 32 bit mode
or 64 bit mode.

To find out if your machine can boot into 64 bit mode, enter

        # isalist

If you do not see "sparcv9", you will not be able to boot this
system into 64 bit mode.

Note: On Ultra systems with a CPU speed of 200 MHz or less, the file
/platform/sun4u/boot.conf must have the following line uncommented:

ALLOW_64BIT_KERNEL_ON_UltraSPARC_1_CPU=true

If this line was commented out when the system was booted, isalist will NOT
list sparcv9 as an option, even if all packages for 64 bit support are
installed.

===================================================================

To see if you are currently in 64 or 32 bit mode, enter:

        # isainfo -v

If the output shows:

        64-bit sparcv9 applications
        32-bit sparc applications

then you are running 64 bit mode.  

If the output shows:

        32-bit sparc applications

then you are booted into 32 bit mode.

===================================================================

To change modes, enter the following at the "ok>" prompt:

        To set up booting 32-bit mode:
                setenv boot-file kernel/unix

        To set up booting 64-bit mode:
                setenv boot-file kernel/sparcv9/unix