Sun Ultra 30 UPA/PCI System

This appendix describes some information that is different in this PCI-bus-based system than in an Sbus-based Sun system.

PCI-Based System

The banner output is as follows, indicating that it is a PCI-based system by showing "UPA/PCI" in banner

ok banner
Sun Ultra 30 UPA/PCI (UltraSPARC 200MHz), Keyboard Present
OpenBoot 3.9, 64 MB memory installed, Serial #8431666
Ethernet address 8:0:20:80:a8:32, Host ID: 8080a832

Note that the output of show-devs command shows some PCI- based nodes. Also, PCI-based systems use generic names for devices. On-board network is named "network", and internal disks are named " diskn ", representing the scsi target number for that disk.

Plug in PCI cards with their own FCodePROM may or may not be using generic names. For details on generic names, see Recommended Practices available on homepage for Open Firmware Working Group at:

ok show-devs

The following shows the output of the devalias command on the Sun Ultra 30UPA/PCI system:

ok devalias
screen /SUNW,ffb@1e,0
net /pci@1f,4000/network@1,1
disk /pci@1f,4000/scsi@3/disk@0,0
cdrom /pci@1f,4000/scsi@3/disk@6,0:f
tape /pci@1f,4000/scsi@3/tape@4,0
tape1 /pci@1f,4000/scsi@3/tape@5,0
tape0 /pci@1f,4000/scsi@3/tape@4,0
disk6 /pci@1f,4000/scsi@3/disk@6,0
disk5 /pci@1f,4000/scsi@3/disk@5,0
disk4 /pci@1f,4000/scsi@3/disk@4,0
disk3 /pci@1f,4000/scsi@3/disk@3,0
disk2 /pci@1f,4000/scsi@3/disk@2,0
disk1 /pci@1f,4000/scsi@3/disk@1,0
disk0 /pci@1f,4000/scsi@3/disk@0,0
scsi /pci@1f,4000/scsi@3
floppy /pci@1f,4000/ebus@1/fdthree
ttyb /pci@1f,4000/ebus@1/se:b
ttya /pci@1f,4000/ebus@1/se:a
keyboard! /pci@1f,4000/ebus@1/su@14,3083f8:forcemode
keyboard /pci@1f,4000/ebus@1/su@14,3083f8
mouse /pci@1f,4000/ebus@1/su@14,3062f8

When you look at properties for the device node of a PCI device, you will see few properties that are unique to PCI devices and few properties has a different format than that of a SBus device. For example, the output of .properties for a PCI device is:

ok cd /pci@1f,4000/scsi@3
ok .properties
interrupts 00000020
assigned-addresses 81001810 00000000 00000400 00000000 00000100
82001814 00000000 00010000 00000000 00000100
82001818 00000000 00011000 00000000 00001000
device_type scsi-2
clock-frequency 02625a00
reg 00001800 00000000 00000000 00000000 00000000
01001810 00000000 00000000 00000000 00000100
02001814 00000000 00000000 00000000 00000100
02001818 00000000 00000000 00000000 00001000
model Symbios,53C875
compatible gl
name scsi
devsel-speed 00000001
class-code 00010000
max-latency 00000040
min-grant 00000011
revision-id 00000003
device-id 0000000f
vendor-id 00001000

Generic Names

The following example shows generic names for devices under /pci@1f,4000/scsi@3 :

ok ls
f00809d8 tape
f007ecdc disk

The command .speed shows the speed for the processor and busses attached to the system:

ok .speed
CPU Speed : 200.00MHz
UPA Speed : 100.00MHz
PCI Bus A : 66Mhz
PCI Bus B : 33Mhz

pcia and pcib PCI Busses

The Sun Ultra 30 UPA/PCI system has two PCI busses, pcia & pcib . The probing of slots for those busses are controlled by the following two NVRAM configuration variables.


Variable Name

Default value




Controls probe order of plug-in devices under pcia



Controls probe order of plug-in devices under pcib

pcia-probe-list corresponds to devices under /pci@1f,2000 and pcib-probe-list corresponds to devices under /pci@1f,4000 .

pcia supports one plug-in client (slot 1, marked as "PCI 1, 66" ). It can support a device which is 64 bits wide and runs up to 66Mhz. Even though there is no client/slot under pcia corresponding to value 2, 2 is included in pcia-probe-list default value for historical reasons.

pcib supports three plug -in clients (slot 2,4, and 5; marked as "PCI 2", "PCI 3", and "PCI 4" respectively). pcib can support devices which are 64 bits wide and run upto 33Mhz.

Copyright © 2001, Sun Microsystems, Inc. All rights reserved.