HP-UX 11i September 2001 Release Notes

Workstation/Server Specific Information
N4000 Server Functionality
Chapter 3
50
On N4000 systems, the firmware programs only the boot and console devices. The PCI
CDIO must program the remaining devices, using information provided by firmware to
the operating system (PAT PSM gets this for PCI).
The N4000 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 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 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.