Intel Extensible Firmware Interface - Manual (Page 927)

32/64-Bit UNDI Specification
Version 1.10 12/01/02 E-61
E.4.8.2 Waiting for the Command to Execute
Monitor the upper two bits (14 & 15) in the CDB.StatFlags field. Until these bits change to
report PXE_STATFLAGS_COMMAND_COMPLETE or PXE_STATFLAGS_COMMAND_FAILED ,
the command has not been executed by the UNDI.
StatFlags Reason
COMMAND_COMPLETE Command completed successfully. UNDI and network device have been
reset. Check StatFlags.
COMMAND_FAILED Command failed. StatCode field contains error code.
COMMAND_QUEUED Command has been queued.
INITIALIZE Command has been not executed or queued.
E.4.8.3 Checking Command Execution Results
After command execution completes, either successfully or not, the CDB.StatCode field
contains the result of the command execution.
StatCode Reason
SUCCESS Command completed successfully. UNDI and network device have been
reset. Check StatFlags.
INVALID_CDB One of the CDB fields was not set correctly.
BUSY UNDI is already processing commands. Try again later.
QUEUE_FULL Command queue is full. Try again later.
NOT_STARTED The UNDI is not started.
NOT_INITIALIZED The UNDI is not initialized.
DEVICE_FAILURE The network device could not be initialized.
NVDATA_FAILURE The nonvolatile storage is not valid.
StatFlags
Check the StatFlags to see if there is an active connection to this network device. If the no media
StatFlag is set, the UNDI and network device are still reset.
PXE_STATFLAGS_RESET_NO_MEDIA