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IXP400 Software
Access-Layer Components: Feature Control (IxFeatureCtrl) API
April 2005 IXP400 Software Version 2.0 Programmer’s Guide
186 Document Number: 252539, Revision: 007
12.4 Component Check by Other APIs
The ixFeatureCtrlComponentCheck( ) function checks for the availability of the specified
hardware component. The other Access-Layer components in software release 2.0 use this function
during their initialization routines to determine whether the required hardware features are
available.
Also, the IxNpeDl API uses the function to prevent the erroneous download of NPE microcode to
disabled or unavailable NPEs.
12.5 Software Configuration
The provided software configuration structure and supporting functions can be modified at run-
time. The software configuration structure is an array that stores the enable/disable state of
particular global options. Other software components can be designed to read or write the software
configuration array to enable or disable certain software features prior to initialization.
In software release 2.0, there are two entries in the software configuration array;
IX_FEATURECTRL_ETH_LEARNING and IX_FEATURECTRL_ORIGB0_DISPATCHER.
IX_FEATURECTRL_ETH_LEARNING
IxEthDb performs an ixFeatureCtrlSwConfigurationCheck( ) to determine the value of
IX_FEATURECTRL_ETH_LEARNING. IxEthDb uses this value to decide whether or not to
activate the NPE-based EthDB learning, and to spawn an Intel XScale core thread to monitor it.
Any component or codelet can modify the value prior to IxEthDb initialization using
ixFeatureCtrlSwConfigurationWrite(IX_FEATURECTRL_ETH_LEARNING, [TRUE or
FALSE]). Once IxEthDB has been initialized, the software configuration cannot be changed.
IX_FEATURECTRL_ORIGB0_DISPATCHER
IxQMgr performs a ixFeatureCtrlSwConfigurationCheck (IX_FEATURECTRL_ORIGB0_DISPA
TCHER) to determine if the livelock prevention feature is required. Prior to start of the dispatcher,
application users employ ixQMgrDispatcherLoopGet( ) to get the correct queue dispatcher. This
feature is configured as TRUE by default, meaning that B-0 versions of the IXP42X product line
5
†
HDLC Coprocessor
4
†
DES Coprocessor
3
†
AES Coprocessor
2
†
Hashing Coprocessor
1
†
USB Coprocessor
0
†
RComp Circuitry
Table 37. Feature Control Register Values (Sheet 2 of 2)
Bits Description
† For bit 0 through 15, 18, 20-21 the following values apply:
• 0x0 — The hardware component exists and is not software disabled.
• 0x1 — The hardware component does not exist, or has been software disabled.