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Extensible Firmware Interface Specification
16.3.4 CD-ROM and DVD-ROM
A CD-ROM or DVD-ROM may contain multiple partitions as defined Sections 16.1 and 16.2 and
in the "El Torito" specification.
EFI code does not assume a fixed block size.
Since the EFI file system definition does not use the same Initial/Default entry as a legacy
CD-ROM, it is possible to boot Intel architecture personal computers using an EFI CD-ROM or
DVD-ROM. The inclusion of boot code for Intel architecture personal computers is optional and
not required by EFI.
16.3.5 Network
To boot from a network device, the Boot Manager uses the Load File Protocol to perform a
on the network device. This uses the PXE Base Code Protocol to perform DHCP
LoadFile()
and Discovery. This may result in a list of possible boot servers along with the boot files available
on each server. The Load File Protocol for a network boot may then optionally produce a menu of
these selections for the user to choose from. If this menu is presented, it will always have a
timeout, so the Load File Protocol can automatically boot the default boot selection. If there is only
one possible boot file, then the Load File Protocol can automatically attempt to load the one boot
file.
The Load File Protocol will download the boot file using the MTFTP service in the PXE Base Code
Protocol. The downloaded image must be an EFI image that the platform supports.
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