Table of Contents
Advertisement
72
Disabling Parity on a Sun Ultra System
A fault in the Number Nine T2R chip causes the
Md4/PCX board to mishandle parity generation. To
run the Md4/PCX board in a Sun UltraSPARC system,
you must disable the PCI bus parity.
You must disable parity before you install the Md4/PCX
board in an Ultra system. Otherwise, you will not be able
to boot the system.
To disable parity for a 33 MHz bus
1. Power on or halt the system to get to the ok> prompt
before you install the Md4/PCX board.
2. Type the following code to shut off the parity during
initial boot for the Ultra 5, Ultra 30, and Ultra 60:
ok>
0:
1:
ok>
ok>
If you are using an Ultra 450, see "To disable parity for
an Ultra 450 system" on page 73.
3. Boot the operating system, and then add this line to the
/etc/system
set pci:pci_per_enable=0
4. Turn off the power to your workstation and install the
Md4/PCX board, as described in "Installing the Board
in a Sun PCI Workstation" on page 75.
Now, it is safe to boot the system.
nvedit
00 1fe.0100.0004 1d spacew!
^C
nvstore
setenv use-nvramrc? true
file:
Chapter 3
Advertisement
Table of Contents
