PCI Hot Plug User's Guide 2.5.1

2.2.1 I/O nullification option

OBP disables all LAN ports and PCI cards installed (onboard serial ports are excluded) on a system board by changing this environment variable. Internal SCSI boards on PRIMEPOWER900/1500/2500/HPC2500 also can be disabled. When you change an OBP environment variable using the eeprom(1M) command, the system must be rebooted to make the change effective.

If partitioning is available on the system, OBP environment variables exist on each partition. The setting for one partition does not influence other partitions. Refer to "Dynamic Reconfiguration User's Guide" for more details.

• For GP7000Fmodel 1000/2000 and PRIMEPOWER800/1000/2000
  # eeprom no-io-sb-cX=Y

• For PRIMEPOWER450/900/1500/2500/HPC2500
  # eeprom no-io-sb="XY"

• For PRIMEPOWER900/1500/2500 and XPAR environment
  # eeprom no-io-sb="XY-N"

where X is the cabinet number and Y is the slot number within the cabinet and N is offset number in the system board.

Example:

• For GP7000Fmodel 1000/2000 and PRIMEPOWER800/1000/2000
  # eeprom no-io-sb-c0
  Check the I/O nullification setting on cabinet #0.
  # eeprom no-io-sb-c0=134
  The I/O devices on boards numbered 1, 3 and 4 in cabinet #0 will be hidden.
• For PRIMEPOWER450/900/1500/2500/HPC2500
  # eeprom no-io-sb
  Check the I/O nullification setting for all boards.
  # eeprom no-io-sb="01 03 04 10"
  The I/O devices on boards numbered 1, 3, 4 in cabinet #0 and the ones on board numbered 0 in cabinet #1 will be hidden.

When PCI card is configured in a PCI slot with no-io-sb-cX or no-io-sb setting, the slot is powered on. PCI Hot Plug operations are not available for PCI cards. Removing a PCI card may cause a system failure.