SYS$EFI.SYS is the core bootstrap partition found on OpenVMS I64,
    and it is comprised of a FAT partition containing various files.

    The location of this file must be registered in the bootblock
    structures using the DCL command SET BOOTBLOCK or by invoking the
    sys$setboot.exe image.

    This section contains both an example and a detailed description.

1  –  Example

 $ RUN SYS$SYSTEM:EFI$CP
 EFI$CP> initialize sys$common:[sys$ldr]sys$efi.tmp -
   /device_alias=efi:/create/size=256000/contiguous -
   vmsefi /nolog
 EFI$CP> mount sys$common:[sys$ldr]sys$efi.tmp -
   /device_alias=efi: vmsefi
 %EFI-I-SEEKMBR, searching for Master Boot Record
 %EFI-I-ONEPART, single-
 partition volume; no Master Boot Record partitioning
 %EFI-I-SEEKBPB, searching for BIOS Parameter Block
 %EFI-I-SEEKBPBOK, valid BIOS Parameter Block detected
 %EFI-I-MOUNTED, FAT volume VMSEFI has been mounted
 -EFI-I-NOPARTITION, the target volume is not partitioned
 EFI$CP> CREATE/DIRECTORY EFI:\EFI\
 EFI$CP> CREATE/DIRECTORY EFI:\EFI\VMS\
 EFI$CP> COPY VMS_LOADER.EFI EFI:\EFI\VMS\
 EFI$CP> COPY IPB.EXE EFI:\EFI\VMS\
 EFI$CP> DISMOUNT EFI:
 EFI$CP> EXIT
 $ SET FILE/NOMOVE SYS$COMMON:[SYS$LDR]SYS$EFI.TMP
 $ SET BOOTBLOCK SYS$SYSDEVICE:/I64

2  –  Description

    The example creates, initializes and populates the SYS$EFI.TMP
    bootstrap partition with the two core directories and the two
    core files IPB.EXE and VMS_LOADER.EFI. (The actual bootstrap
    partition name is SYS$EFI.SYS.)

    The above example deliberately shows the hypothetical partition
    filename SYS$EFI.TMP and not the actual SYS$EFI.SYS partition
    filename. Corruption of the actual bootstrap partition will
    likely prevent OpenVMS I64 from bootstrapping.

    When a new bootable partition is created on the system disk or
    when an existing bootable partition is relocated on the system
    disk, use the SET BOOTBLOCK command or invoke the sys$setboot
    image directly to update the OpenVMS I64 bootblock and related
    structures accordingly. An existing bootable partition need not
    be re-registered, whether or not the partition contents have
    been modified. Use the SET FILE/NOMOVE command to prevent a
    defragmentation tool from erroneously relocating the file.