HP-UX 11i September 2001 Release Notes

Workstation/Server Speciﬁc Information

N4000 Server Functionality

Chapter 3

PAT PSM

This software module interacts with N-Class ﬁrmware to discover and keep track of the

CEC components conﬁgured on the N4000.

The PAT PSM also provides access to platform-speciﬁc hardware components at

runtime.

Although it may be included and linked into all 64-bit kernels, the PAT PSM is useful

only to N4000 systems. A run-time test determines whether the linked-in PAT PSM is

installed on the system as of HP-UX 11.0 Extension Pack, May 1999.

Since PAT functionality is only supported on 64-bit systems, 32-bit kernels do not have

the PAT PSM built into them.

SBA PSM

The SBA PSM detects and conﬁgures the system bus adapter hardware and translates

addresses between the Merced bus and the underlying LBA.

The SBA PSM supports system bus adapters on all N4000 systems. It is active and

visible to users on N4000 systems.

SAPIC PSM

The SAPIC PSM manages line-based interrupts. This conﬁgurable software module

handles interrupts routed through the I/O SAPICs.

The SAPIC PSM conforms to the Central Bus CDIO platform infrastructure. It

maintains the SAPIC redirection table.

CB CDIO

The CB CDIO contains interfaces that isolate platform-speciﬁc code from the rest of the

kernel. These interfaces allow generic access to the platforms, regardless of which

platform-speciﬁc PSMs are active in the kernel. The Central Bus framework

interconnects the different PSMs that control the hardware.

For backward compatibility, the PA-CDIO has been restructured into a PA-generic PSM

and PA-legacy PSM.

LBA CDIO

The LBA CDIO provides bus translation for all activity between the System Bus Adapter

and the PCI bus. The LBA CDIO is the hardware-enabling HP-UX kernel module that

controls the lower bus adapter and, therefore, all the intricacies of the dependent

hardware. This CDIO also resolves any overlapping conﬁguration issues with LBA, and

interacts directly with the PCI CDIO.

PCI CDIO

The PCI subsystem has been redesigned to support PCI Card Online Addition and

Replacement (OLAR) and to support a new interrupt line routing architecture.

On legacy systems (B-, C-, and V-Class), platform ﬁrmware had complete responsibility

for conﬁguring all devices. In order to support PCI Card OLAR, the PCI CDIO detects

unconﬁgured PCI devices and programs the base address registers.