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Location codes
This system unit uses physical location codes in conjunction with AIX location codes to provide mapping of
the failing field replaceable units. The location codes are produced by the system unit's firmware and AIX.
Physical location codes
Physical location codes provide a mapping of logical functions in a platform (or expansion sites for logical
functions, such as connectors or ports) to their specific locations within the physical structure of the
platform.
Location code format
The location code is an alphanumeric string of variable length, consisting of a series of location identifiers,
separated by a dash (-), or slash (/), or a pound sign (#) character. The series is hierarchical; that is, each
location identifier in the string is a physical or logical child of the one preceding it.
v The - (dash) separator character represents a normal structural relationship where the child is a
separate physical package and it plugs into (or is connected to) the parent. For example, P1-C1 is a
processor card (C1) plugged into a planar (P1), or P1-M1 is a DIMM plugged into a planar (P1).
v The / (slash) separator character separates the base location code of a function from any extended
location information. A group of logical devices can have the same base location code because they are
all on the same physical package, but might require extended location information to describe the
connectors that they support. For example, P2/S1 describes the location of the serial port 1 controller
and its connector (S1), which is located on planar P2 (its base location code), but the / indicates that
further devices can be connected to it at the external S1 serial connector. The location code P2/Z1
indicates an integrated SCSI controller that drives connector Z1, although location codes of P2-Z1-...
point to the actual SCSI bus and devices.
v The # (pound sign) separator character indicates a cable connection between a connector and parent.
The following are examples:
v U0.1-P1-C1 identifies processor card C1 plugged into the CEC backplane P1.
v U0.1-P1-C2-M1 identifies DIMM M1 plugged into slot 1 on processor card C2 connected to the CEC
backplane P1.
v U0.1-P1/S1 identifies serial port 1 controller on the CEC backplane P1 or the connector for serial port 1.
v U0.1-P2/Z1 identifies an integrated SCSI port controller on PCI riser card P2 that drives internal SCSI
drive connector Z1.
v U0.1-P2-Z1-A8... points to the actual SCSI bus and devices attached to Z1; in this case, a hot-plug disk
drive in bay location D10 with a SCSI ID of 8.
AIX location codes
The basic formats of the AIX location codes are as follows:
v For non-SCSI devices and drives:
– AB-CD-EF-GH
v For SCSI devices and drives:
– AB-CD-EF-G,H
Non-SCSI devices and drives
For planars, cards, and non-SCSI devices, the location code is defined as follows:
AB-CD-EF-GH
| | | |device/FRU/port ID
| | connector ID
| devfunc number, adapter number or physical location
bus type or PCI parent bus
v The AB value identifies a bus type or PCI parent bus as assigned by the firmware.
Chapter 1. Reference information
17
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