Intel Extensible Firmware Interface, Specification

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32/64-bit UNDI Specification
Version 1.02 12/12/00 443
G.4.12.2 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. DB is written.
COMMAND_FAILED Command failed. StatCode field contains error code.
COMMAND_QUEUED Command has been queued.
INITIALIZE Command has been not executed or queued.
G.4.12.3 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.
INVALID_CDB One of the CDB fields was not set correctly.
INVALID_CPB One of the CPB 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.
UNSUPPORTED The requested operation is not supported.
Before Using the DB
The DB is used to read the current station, broadcast and permanent station MAC addresses. The
CDB.DBsize
and
CDB.DBaddr
fields can be set to
PXE_DBSIZE_NOT_USED
and
PXE_DBADDR_NOT_USED
if these addresses do not need to be read.
typedef struct s_pxe_db_station_address {
// Current station MAC address.
PXE_MAC_ADDR StationAddr;
// Station broadcast MAC address.
PXE_MAC_ADDR BroadcastAddr;
// Permanent station MAC address.
PXE_MAC_ADDR PermanentAddr;
} PXE_DB_STATION_ADDRESS;