Improved ioscan Description Field for PCI Devices

The ioscan command displays I/O devices, memory modules, and CPUs in a tabular form for users.

Previously, PCI interface cards were listed in the ioscan output by cryptic values in the ioscan description field. These values have been replaced by PCI device header fields which provide a clearer description for most (common) devices. See the example provided below.

The changes are:

Dropped “FRU” info. When PCI drivers update the description fields (as the SCSI interface driver c720 currently does), this gets lost anyway. For more information on the SCSI interface driver, see “SCSI Drivers scsi3 and c720” in Chapter 3.
Added lookup of the class/subclass headers for most PCI specified devices (for example, PCI Ethernet). This provides useful and correct information when a device driver is not loaded or does not update the description.
Dropped “PCI Bus Bridge” to shorten the CDIO description string. Epic CDIO would result in “EPIC Bridge.” “PCItoPCI” is the name of the new CDIO for PCI-to-PCI Bridges (PPBs).

This is the old output:

H/W Path           Class           Description
8                  bc              Pseudo Bus Converter
8/0                ba              PCI Bus Bridge - GSCtoPCI
8/0/1/0            ba              PCI(10110024)  
8/0/1/0/4/0        lan             PCI(10110019)
8/0/1/0/5/0        ext_bus         Ultra Wide SCSI
8/0/1/0/5/0.1      target
8/0/1/0/5/0.1.0    disk            HP C2247WD

Here’s the new output:

H/W Path          Class            Description
8                 bc               Pseudo Bus Converter 
8/0               ba               GSCtoPCI Bridge
8/0/1/0           ba               PCItoPCI Bridge
8/0/1/0/4/0       lan              PCI Ethernet (10110019)
8/0/1/0/5/0       ext_bus          Ultra Wide SCSI
8/0/1/0/5/0.1     target
8/0/1/0/5/0.1.0   disk             HP C2247WD

The ioscan -F option provides the same as well as additional information, separated by colons for parsing by scripts. This remains unchanged. Scripts can (and should) continue to use the -F option.

If scripts are parsing this output, the most significant “keys” remain the vendor/device ID (hex digits) and “PCI” string.

Improved ioscan Description Field for PCI Devices

Technical documentation

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