Intel Extensible Firmware Interface - Manual (Page 909)

32/64-Bit UNDI Specification
Version 1.10 12/01/02 E-43
E.4.3 Start
This command is used to change the UNDI operational state from stopped to started. No other
operational checks are made by this command. Protocol driver makes this call for each network
interface supported by the UNDI with a set of call back routines and a unique identifier to identify
the particular interface. UNDI does not interpret the unique identifier in any way except that it is a
64-bit value and it will pass it back to the protocol driver as a parameter to all the call back routines
for any particular interface. If this is a S/W UNDI, the callback functions Delay(), Virt2Phys(),
Map_Mem(), UnMap_Mem(), and Sync_Mem() functions will not be called by this command.
E.4.3.1 Issuing the Command
To issue a Start command for H/W UNDI, create a CDB and fill it in as shows in the table below:
CDB Field How to initialize the CDB structure for a H/W UNDI Start command
OpCode PXE_OPCODE_START
OpFlags PXE_OPFLAGS_NOT_USED
CPBsize PXE_CPBSIZE_NOT_USED
DBsize PXE_DBSIZE_NOT_USED
CPBaddr PXE_CPBADDR_NOT_USED
DBaddr PXE_DBADDR_NOT_USED
StatCode PXE_STATCODE_INITIALIZE
StatFlags PXE_STATFLAGS_INITIALIZE
IFnum A valid interface number from zero to !PXE.IFcnt
Control Set as needed
To issue a Start command for S/W UNDI, create a CDB and fill it in as shows in the table below:
CDB Field How to initialize the CDB structure for a S/W UNDI Start command
OpCode PXE_OPCODE_START
OpFlags PXE_OPFLAGS_NOT_USED
CPBsize sizeof(PXE_CPB_START)
DBsize PXE_DBSIZE_NOT_USED
CPBaddr Address of a PXE_CPB_START structure.
DBaddr PXE_DBADDR_NOT_USED
StatCode PXE_STATCODE_INITIALIZE
StatFlags PXE_STATFLAGS_INITIALIZE
IFnum A valid interface number from zero to !PXE.IFcnt
Control Set as needed