HP-UX 11i December 2002 Release Notes

Workstation/Server Specific Information
N4000 and rp7400 Server Functionality
Chapter 5
83
On N4000 and rp7400 systems, the firmware programs only the boot and console
devices. The PCI CDIO programs the remaining devices, using information provided by
firmware to the operating system (PAT PSM gets this for PCI).
The N4000 and rp7400 disassociates interrupt routing/handling from the
platform-specific bus adapter. On legacy PCI systems, the interrupt lines are routed to
the PCI host bus-adapter chip and handled by the same driver (for example, GSCtoPCI
and EPIC CDIOs). On N4000 and rp7400 systems, though the interrupt lines are routed
to the LBA (PCI bus interface chip), SAPIC PSM handles the interrupt support instead
of the LBA CDIO.
LBA CDIO provides N4000 and rp7400 specific services to support PCI drivers and
access to the PCI bus. Legacy PCI bus adapter drivers have been modified to be
compatible with the new PCI CDIO.
PCItoPCI CDIO
The restructuring of the PCI subsystem permits PCItoPCI configuration of devices to
more than two bridges deep. There is no new functionality for this release.