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Disabled isohybrid MBR production on request of H. Peter Anvin

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Thomas Schmitt
2010-04-01 14:14:00 +00:00
parent d60e2d79ca
commit af30d86501
4 changed files with 108 additions and 96 deletions
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libisoburn/trunk/xorriso/xorriso.texi
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@ -508,11 +508,17 @@ Emulation -as mkisofs supports the example options out of the ISOLINUX wiki.
@*
The support for other boot image types is sparse.
@*
An MBR is generated together with the El Torito boot record if the boot image
bears the isohybrid signature of ISOLINUX 3.72 or later. It will occupy the
first 512 bytes of the emerging ISO image and enable booting from media which
appear as hard disk rather than as CDROM. An MBR does not hamper CDROM booting.
The MBR of a follow-up session can get in effect only on overwriteable media.
@c
@c >>> isohybrid MBR generation has been disabled on request
@c >>> of its inventor H. Peter Anvin on 31 Mar 2010
@c
@c An MBR is generated together with the El Torito boot record if the
@c boot image bears the isohybrid signature of ISOLINUX 3.72 or later.
@c It will occupy the first 512 bytes of the emerging ISO image and
@c enable booting from media which appear as hard disk rather than
@c as CDROM. An MBR does not hamper CDROM booting. The MBR of a
@c follow-up session can get in effect only on overwriteable media.
@c
@c man .PP
@sp 1
@cindex ACL, _definiton
@ -2580,8 +2586,9 @@ Most safe is the default: -boot_image "any" "discard".
@sp 1
A bootspec is a word of the form name=value and is used to describe the
activation of a ISOLINUX boot image by an El Torito record and eventually
a MBR. The names "dir" and "bin_path" lead to boot image activation.
activation of a ISOLINUX boot image by an El Torito record.
@c and eventually a MBR.
The names "dir" and "bin_path" lead to boot image activation.
@*
On all media types this is possible within the first session. In further
sessions an existing boot image can get replaced by a new one, but depending
@ -2611,10 +2618,12 @@ cat_path at -commit time.
It is subject to normal -overwrite and -reassure processing if there is already
a file with the same name.
@*
Bootspec "isohybrid=off" disables MBR generation, "isohybrid=on" prevents the
write session if not the isohybrid signature is found in the bin_path file.
Default is "isohybrid=auto" which silently omits the MBR if the signature is
missing.
@c
@c Bootspec "isohybrid=off" disables MBR generation, "isohybrid=on"
@c prevents the write session if not the isohybrid signature is found
@c in the bin_path file. Default is "isohybrid=auto" which silently
@c omits the MBR if the signature is missing.
@c
@end table
@c man .TP
@c man .B Character sets:
@ -3650,8 +3659,8 @@ same name and hardcoded argument "on", e.g. -acl "on".
Explicit arguments are expected by @minus{}@minus{}stdio_sync
and @minus{}@minus{}scdbackup_tag.
@*
Quite special is isolinux_mbr= (see -boot_image isolinux isohybrid=).
@*
@c Quite special is isolinux_mbr= (see -boot_image isolinux isohybrid=).
@c @*
Personalites "@strong{xorrisofs}", "@strong{genisoimage}",
and "@strong{genisofs}" are aliases for "mkisofs".
@*