Hi
Here's an excert from the page that I mentioned which refers to the following doc
Make sure that you don't have any 32-bit kernel drivers loaded requiring special attention before
converting between 32 to 64-bit. This can cause the mk_kernel at the end to fail during the upgrade. You can verify that the machine is running on a 64-bit
kernel using "getconf KERNEL_BITS".
To update from HP-UX 11.0 32-bit to 64-bit OS (or vice versa), follow these steps:
1. Verify that your system supports 64-bit operation. Please consult "Criteria for Transitioning to a 64-Bit OS" on page 17".
2. Check the following table for device drivers that may need special attention before conversion between 32- and 64-bit Operation. These drivers are supplied on the HP-UX Application CD.
3. Convert your system to either 32-bit or 64-bit operation. If you have drivers or kernel modules proceed to "Procedures for Converting between 32-bit and 64-bit Operation for Kernel with Drivers" on page 70. Otherwise, proceed to "Procedure to Convert between 32-bit and 64-bit OS" on page 72.
The table below lists Device Drivers Requiring Special Attention Before Conversion between 32- and 64-bit Operation.
Bundle Driver(s Name
J2658BA, J2157B fddi Server FDDI/9000
J3701BA fddi3 HSC FDDI/9000 Driver
J2166B, J2250B token2 HP-PB token ring
J2806CA atmgsc, atm2gsc HSC ATM 155/622
J32070B strlan, osi1 OST/9000 S800
J2793B syncio, nioxb, X.25/9000 Link
eisaxb, x25hal,
sxb, wan, lapb,
x25plp, x25sentry,
x25idmap, plp2llc2,
trcl2, trcl3
Hope this is of some help
Queenie