High Availability Software for the Intel
®
NetStructure
TM
ZT 4901 Technical Product Specification 99
Demonstration Utilities
10.1.4 Hot Swap Interface
The basic purpose of the CompactPCI hot swap functionality is to allow orderly insertion or
extraction of CompactPCI boards without affecting operation of the system involved. The hot swap
interface in this demo operates under Linux* and VxWorks*. The current demo version does not
support hot swap functionality. However, this new HS module does demonstrate manipulation of
the Hot Swap API (HS API).
10.1.4.1 HS Functional Description
The HS module exercises/simulates these capabilities:
1. Hot swap board insertion
2. Hot swap board extraction
3. Slot information retrieval
4. PCI tree information retrieval
5. Catching and printing of notification messages
10.1.4.1.1 Hot Swap Board Insertion
Hot swap board insertion can be simulated by the demo application. When this is performed, the
operating system looks for drivers that can be installed for this new device. The following two files
contain information about PCI devices and their drivers:
/lib/modules/2.4.18-rh/modules.dep
/lib/modules/2.4.18-rh/modules.pcimap
The file modules.pcimap has a more complicated structure than modules.dep. This file specifies the
PCI configuration information identifying a particular board and the specific driver module to load
for it.
10.1.4.1.2 Hot Swap Board Extraction
Hot swap board extraction can be simulated by the demo application. In Linux, the software
disconnection request cannot be vetoed by a functional driver or by an application. However the
board cannot be extracted if it is controlled by a legacy driver (a driver that does not conform to the
current model for PCI drivers, introduced in the 2.4 kernel).
10.1.4.1.3 Slot Information Retrieval
If this functionality is performed, information on the board is retrieved based on the slot path. The
type of information retrieved from the selected PCI device is described in chapter 9, “High
Availability Slot Control Interface,” in the PICMG 2.12 CompactPCI Hot Swap Infrastructure
Interface Specification. For more details on PICMG, see Section H.1, “CompactPCI” on page 131.
10.1.4.1.4 PCI Tree Information Retrieval
When this functionality is executed, the related API call returns a list of PCI devices available on
the system. Flags are set for each device to determine its state at that particular time. See the “PCI
Tree Information Retrieval Flags” table.
