Allowing up to 32 boot images, -boot_image any id_string=, sel_crit=
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@ -329,8 +329,8 @@ characters of filename length. It is the X/Open System Interface
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standard XSI which demands a file name length of up to 255 characters
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and paths of up to 1024 characters. Rock Ridge fulfills this demand.
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An *El Torito* boot record connects a boot image, which is a binary
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program plus some other files stored in the ISO image, with the
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An *El Torito* boot record connects one or more boot images, which
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are binary program files stored in the ISO image, with the
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bootstrapping facility of contemporary computers. The content of the
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boot image files is not in the scope of El Torito.
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Most bootable GNU/Linux CDs are equipped with ISOLINUX or GRUB boot
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@ -1927,7 +1927,7 @@ File: xorriso.info, Node: Bootable, Next: Charset, Prev: SetWrite, Up: Optio
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==================================
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Contrary to published specifications many BIOSes will load an El Torito
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object from the first session on media and not from the last one, which
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record from the first session on media and not from the last one, which
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gets mounted by default. This makes no problems with overwriteable
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media, because they appear to inadverted readers as one single session.
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But with multi-session media CD-R[W], DVD-R[W], DVD+R, it implies that
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@ -1940,40 +1940,41 @@ But one should not rely on the capability to influence the bootability
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of the existing sessions, unless one can assume overwriteable media.
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-boot_image "any"|"isolinux"|"grub"
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"discard"|"keep"|"patch"|"show_status"|bootspec
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"discard"|"keep"|"patch"|"show_status"|bootspec|"next"
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Define the handling of an eventual El Torito boot image object
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Define the handling of an eventual set of El Torito boot images
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which has been read from an existing ISO image or define how to
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make a prepared boot image file set bootable. Such file sets get
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produced by ISOLINUX or GRUB.
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Each -boot_image command has two arguments: type and setting. More
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than one -boot_image command may be used to define the handling.
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Sequence matters.
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than one -boot_image command may be used to define the handling of
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one or more boot images. Sequence matters.
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Types "isolinux" and "grub" care for known peculiarities. Type
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"any" makes no assumptions about the origin of the boot image.
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"any" makes no assumptions about the origin of the boot images.
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El Torito boot images of any type can be newly inserted, or
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discarded, or patched, or kept unaltered. The latter is only safe
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if the format of the boot image is relocatable without content
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changes.
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Some boot images contain a boot info table, which needs to be
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patched when the boot image gets newly introduced into the ISO
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image or if an existing image gets relocated. This is
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automatically done if type "isolinux" or "grub" is given, but not
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with "any".
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discarded, or patched, or kept unaltered. Whether to patch or to
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keep depends on whether the boot images contain boot info tables.
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A boot info table needs to be patched when the boot image gets
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newly introduced into the ISO image or if an existing image gets
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relocated. This is automatically done if type "isolinux" or "grub"
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is given, but not with "any".
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"show_status" will print what is known about the loaded image and
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its designated fate.
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CAUTION: This is an expert option. xorriso cannot recognize the
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inner form of boot images. So the user has already to know about
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the particular needs of the boot image which is present on the
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input media.
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"next" ends the definition of a boot image and starts a new one.
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Any following -bootimage bootspecs will affect the new image. The
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first "next" discards eventually loaded boot images and their
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catalog.
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CAUTION: xorriso cannot recognize the inner form of boot images.
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So the user has already to know about the particular needs of the
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boot images which are present on the input media.
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Most safe is the default: -boot_image "any" "discard".
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A bootspec is a word of the form name=value and is used to
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describe the activation of a boot image by an El Torito record and
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eventually a MBR. The names "dir" and "bin_path" lead to El
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Torito boot image activation. Name "system_area" activates the
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given file as MBR.
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describe the parameters of a boot image by an El Torito record and
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eventually a MBR. The names "dir", "bin_path", "efi_path" lead to
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El Torito bootable images. Name "system_area" activates a given
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file as MBR.
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On all media types this is possible within the first session. In
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further sessions an existing boot image can get replaced by a new
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one, but depending on the media type this may have few effect at
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@ -1990,21 +1991,39 @@ of the existing sessions, unless one can assume overwriteable media.
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-boot_image isolinux cat_path=/boot/isolinux/boot.cat
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-boot_image isolinux load_size=2048
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-boot_image any boot_info_table=on
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"bin_path=" depicts the binary program which is to be started by
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the BIOS at boot time.
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"bin_path=" depicts the boot image file, a binary program which is
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to be started by the hardware boot facility (e.g. the BIOS) at
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boot time.
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"efi_path=" depicts a boot image file that is ready for EFI
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booting. Its load_size is determined automatically, no boot info
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table gets written, platform_id is 0xef.
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An El Torito boot catalog file gets inserted into the ISO image
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with address "cat_path=" at -commit time. It is subject to normal
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-overwrite and -reassure processing if there is already a file
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with the same name.
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with the same name. The catalog lists the boot images and is read
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by the boot facility to choose one of the boot images.
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"load_size=" is a value which depends on the boot image. Default
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2048 should be overridden only if a better value is known.
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"boot_info_table=on" may be used to apply patching to a boot image
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which is given by "any" "bin_path=". "boot_info_table=off"
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disables patching.
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"discard" gives up an existing boot image.
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"keep" keeps or copies an existing boot image unaltered.
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"patch" applies boot info table patching if an existing boot image
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gets copied to a new location.
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"platform_id=" defines by two hex digits the Platform ID of the
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boot image. "00" is 80x86 PC-BIOS, "01" is PowerPC, "02" is Mac,
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"ef" is EFI.
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"id_string="text|56_hexdigits defines the ID string of the boot
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catalog section where the boot image will be listed. If the value
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consists of 56 characters [0-9A-Fa-f] then it is converted into 28
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bytes, else the first 28 characters become the ID string. The ID
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string of the first boot image becomes the overall catalog ID. It
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is limited to 24 characters. Other id_strings become section IDs.
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"sel_crit="hexdigits defines the Selection Criteria of the boot
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image. Up to 20 bytes get read from the given characters
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[0-9A-Fa-f]. They get attributed to the boot image entry in the
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catalog.
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"discard" gives up an existing boot catalog and its boot images.
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"keep" keeps or copies boot images unaltered and writes a new
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catalog.
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"patch" applies boot info table patching of existing boot images.
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"system_area="disk_path copies at most 32768 bytes from the given
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disk file to the very start of the ISO image. This System Area is
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reserved for system dependent boot software, e.g. an MBR which can
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@ -2015,9 +2034,9 @@ of the existing sessions, unless one can assume overwriteable media.
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"partition_table=on" causes a simple partition table to be written
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into bytes 446 to 511 of the System Area.
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With type "isolinux" it shows a partition that begins at byte 0
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and it causes the boot image LBA to be written into the MBR. For
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the first session this works only if also "system_area=" and
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"bin_path=" or "dir=" is given.
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and it causes the LBA of the first boot image to be written into
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the MBR. For the first session this works only if also
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"system_area=" and "bin_path=" or "dir=" is given.
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With types "any" and "grub" it shows a single partiton which
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starts at byte 512 and ends where the ISO image ends. This works
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with or without system_area= or boot image.
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@ -3902,7 +3921,7 @@ File: xorriso.info, Node: ConceptIdx, Prev: CommandIdx, Up: Top
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* iso_rr_path, _definition: Insert. (line 7)
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* List delimiter, _definiton: Processing. (line 8)
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* MBR, _definiton: Extras. (line 26)
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* MBR, set, -boot_image system_area=: Bootable. (line 85)
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* MBR, set, -boot_image system_area=: Bootable. (line 104)
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* MD5, control handling, -md5: Loading. (line 141)
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* Media, erase, -blank: Writing. (line 45)
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* Media, format, -format: Writing. (line 69)
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@ -3932,7 +3951,7 @@ File: xorriso.info, Node: ConceptIdx, Prev: CommandIdx, Up: Top
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* Ownership, global in ISO image, -uid: SetWrite. (line 125)
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* Ownership, in ISO image, -chown: Manip. (line 42)
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* Ownership, in ISO image, -chown_r: Manip. (line 47)
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* Partition table, _definiton: Bootable. (line 92)
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* Partition table, _definiton: Bootable. (line 111)
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* Pathspec, _definition: SetInsert. (line 120)
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* Pattern expansion, _definition: Processing. (line 22)
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* Pattern expansion, for disk paths, -disk_pattern: Insert. (line 31)
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@ -3983,7 +4002,7 @@ File: xorriso.info, Node: ConceptIdx, Prev: CommandIdx, Up: Top
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* Session, mount command line, -mount_cmd: Inquiry. (line 31)
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* Session, mount parameters, -mount_opts: Inquiry. (line 47)
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* Session, select as input, -load: Loading. (line 11)
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* System area, _definiton: Bootable. (line 85)
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* System area, _definiton: Bootable. (line 104)
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* Table-of-content, search sessions, -rom_toc_scan: Loading. (line 189)
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* Table-of-content, show, -toc: Inquiry. (line 18)
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* Timestamps, set in ISO image, -alter_date: Manip. (line 146)
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@ -4031,50 +4050,50 @@ Node: Media6089
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Node: Methods8519
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Node: Drives11066
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Node: Extras14332
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Node: Processing17736
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Node: Dialog21232
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Node: Options22889
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Node: AqDrive24457
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Node: Loading27363
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Node: Insert39798
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Node: SetInsert48155
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Node: Manip56722
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Node: CmdFind64598
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Node: Filter73943
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Node: Writing78292
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Node: SetWrite84581
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Node: Bootable94713
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Node: Charset100824
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Node: Exception103578
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Node: DialogCtl108093
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Node: Inquiry110438
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Node: Navigate114578
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Node: Verify121932
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Node: Restore130352
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Node: Emulation137008
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Node: Scripting143695
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Node: Frontend149257
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Node: Examples150458
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Node: ExDevices151627
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Node: ExCreate152109
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Node: ExDialog153383
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Node: ExGrowing154645
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Node: ExModifying155447
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Node: ExBootable155948
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Node: ExCharset156495
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Node: ExPseudo157323
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Node: ExCdrecord158217
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Node: ExMkisofs158532
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Node: ExGrowisofs159535
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Node: ExException160659
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Node: ExTime161113
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Node: ExIncBackup161572
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Node: ExRestore165044
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Node: ExRecovery166013
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Node: Files166579
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Node: Seealso167617
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Node: Legal168141
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Node: CommandIdx169063
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Node: ConceptIdx182364
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Node: Processing17730
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Node: Dialog21226
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Node: Options22883
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Node: AqDrive24451
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Node: Loading27357
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Node: Insert39792
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Node: SetInsert48149
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Node: Manip56716
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Node: CmdFind64592
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Node: Filter73937
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Node: Writing78286
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Node: SetWrite84575
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Node: Bootable94707
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Node: Charset102163
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Node: Exception104917
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Node: DialogCtl109432
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Node: Inquiry111777
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Node: Navigate115917
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Node: Verify123271
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Node: Restore131691
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Node: Emulation138347
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Node: Scripting145034
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Node: Frontend150596
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Node: Examples151797
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Node: ExDevices152966
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Node: ExCreate153448
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Node: ExDialog154722
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Node: ExGrowing155984
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Node: ExModifying156786
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Node: ExBootable157287
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Node: ExCharset157834
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Node: ExPseudo158662
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Node: ExCdrecord159556
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Node: ExMkisofs159871
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Node: ExGrowisofs160874
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Node: ExException161998
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Node: ExTime162452
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Node: ExIncBackup162911
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Node: ExRestore166383
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Node: ExRecovery167352
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Node: Files167918
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Node: Seealso168956
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Node: Legal169480
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Node: CommandIdx170402
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Node: ConceptIdx183703
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End Tag Table
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