Intel Extensible Firmware Interface, Specification

Page: 271 / 494

PXE Base Code Protocol
Version 1.02 12/12/00 253
14.1.4 EFI_PXE_BASE_CODE.Discover()
Summary
Attempts to complete the PXE Boot Server and/or boot image discovery sequence.
Prototype
EFI_STATUS
(EFIAPI *EFI_PXE_BASE_CODE_DISCOVER) (
IN EFI_PXE_BASE_CODE *This,
IN UINT16 Type,
IN UINT16 *Layer,
IN BOOLEAN UseBis,
IN EFI_PXE_BASE_CODE_DISCOVER_INFO *Info OPTIONAL
);
Parameters
This
Pointer to the
EFI_PXE_BASE_CODE
instance.
Type
The type of bootstrap to perform. See “Related Definitions”.
Layer
Pointer to the boot server layer number to discover, which must be
PXE_BOOT_LAYER_INITIAL
when a new server type is being
discovered. This is the only layer type that will perform multicast and
broadcast discovery. All other layer types will only perform unicast
discovery. If the boot server changes
Layer
, then the new
Layer
will
be returned.
UseBis TRUE
if Boot Integrity Services are to be used. False otherwise.
Info
Pointer to a data structure that contains additional information on the
type of discovery operation that is to be performed. If this field is
NULL
,
then the contents of the cached
DhcpAck
and
ProxyOffer
packets
will be used.