PCI Hot Plug User's Guide 2.5.1

2.1.1.2 PCI Hot Plug configure operation

• There are two types of PCI slots, one's bus runs at 66MHz frequency and another runs at 33MHz. Usually the PCI card's frequency should match with PCI slot's frequency. When a 33MHz PCI card is inserted into a 66MHz bus, the following message is shown and the PCI card can't be configured.
  
  "66Mhz bus can't accept 33Mhz card"
  
  However 66MHz PCI cards can be degraded to 33MHz. When a 66MHz PCI card is inserted into a 33MHz bus, the following message is shown and the PCI card runs at 33MHz.
  
  "66Mhz capable card throttled back to 33Mhz"
  
  The following table shows the available combinations of PCI cards and PCI slots.

  Y: Yes/acceptable N: No/unacceptable		Frequency of slot
  		66MHz	33MHz
  Frequency of PCI card	66MHz	Y	Y *1
  	33MHz	N *2	Y

  Notes

  *1 When a 66MHz PCI card is inserted into a 33MHz bus, message is shown and the PCI card runs at 33MHz.

  *2 The frequency of PCI slot is decided according to the frequency of PCI card in the slot at system boot time. The frequency will be kept until system reboot. Thus to configure a PCI card with different frequency from the current frequency of the slot, the following manual operation is needed. PCI Hot Plug is not available for this operation.
  1) Shutdown the system
  2) Insert the target PCI card
  3) Boot the system
  If a slot is empty at the system boot, the slot runs at 66MHz

• After the PCI Hot Plug configure operation, devfsadmd(1M) automatically invokes the devfsadm(1M) command to reconfigure I/O device tree.
  Device path names newly added are written to the /etc/path_to_inst file. The same path names are also added to the /devices hierarchy, and links are created in the /dev directory.
  Disk controllers are numbered consecutively as the devfsadm(1M) command encounters them. On a newly inserted PCI card, disk controllers are assigned the next available lowest number by devfsadm(1M).
  If a re-configured system board consists of the same I/O configuration as it was disconnected: the same I/O controllers and the same I/O devices installed at the same slots, the system keeps the same disk controller numbers as before. Otherwise, different numbers may be assigned. In such a case, re-configuring may require changes of /etc/vfstab and may affect some applications.
  The system administrator needs to manage I/O configuration with regard to this issue.
• During PCI Hot Plug configure operation with network devices, if /etc/hostname.interface or /etc/hostname6.interface exists, the Reconfiguration Coordination Manager (RCM) activates the network device automatically.
• Defective PCI cards can't be detected during PCI card configuration. Thus before adding PCI cards, be sure the PCI cards are working without failure.
• During PCI Hot Plug configure and disconnect operations, occasionally the following messages are printed. These messages are not an indication of any errors in PCI Hot Plug operations. Even though these messages are printed, the PCI Hot Plug operations should be done successfully. This bug is fixed with Solaris 8 OS patch 110837-05 and Solaris 9 OS patch 113571-03 as Sun BugID: 4722493.
  

  interpreter[8306]: pci:map-out: XXXXXXXX not mcookie!

  interpreter[8306]: /usr/lib/efcode/sparcv9/interpreter: FC_RUN_PRIV: Priv violation: map-out ( XXXX XXXXXXXXXXX )

  interpreter[8306]: pci:map-out: failed

• During PCI Hot Plug configure operation without installing corresponding driver for the target device, the following message is printed. After configure operation, the device is configured for the system but the driver is not attached.
  Please install the corresponding device driver to the system. If the problem still exists, please contact our customer service.
  

  pcihp (DX): failed to attach one or more drivers for the card in the slot S