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Until Syslinux 3.86, isolinux.bin contained a checksum that was calculated by 'core/checksumiso.pl'. The checksum is related to the patching of the boot info table. During May 2009, a commit by Peter deleted the checksumiso.pl file. The commit is: core: LZO compress the PM part of the core repo.or.cz/syslinux.git/commit/0d82b71304d596d80f3c4520f9dcf90048ca50b7 And so, since

.../checksumiso.pl' file is no longer > included. > How is the checksum of isolinux.bin calculated since then? By the ISO 9660 production program which patches in the Boot Info Table. The computation of checksumiso.pl can be seen in libisofs function make_boot_info_table(): https://dev.lovelyhq.com/libburnia/libisofs/blob/master/libisofs/eltorito.c#L1252 (without Javascript https://dev.lovelyhq.com/libburnia/libisofs/raw/master/libisofs/eltorito.c you have to hop to the line yourself. Sorry. GitLab. Urghhh ...) libisofs does not pad to full blocks of 2048 bytes, like checksumiso.pl di...

...> included. > > How is the checksum of isolinux.bin calculated since then? > > By the ISO 9660 production program which patches in the Boot Info Table. > > The computation of checksumiso.pl can be seen in libisofs function > make_boot_info_table(): > > https://dev.lovelyhq.com/libburnia/libisofs/blob/master/libisofs/eltorito.c#L1252 > (without Javascript > https://dev.lovelyhq.com/libburnia/libisofs/raw/master/libisofs/eltorito.c > you have to hop to the line yourself. Sorry. GitLab. Urghhh ...) > > libisofs does not pad to full blocks of 2048 byte...

...0 0 0 0 0 0 0 0 00000010 : 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 16 : 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 My own cheat sheet: https://dev.lovelyhq.com/libburnia/libisofs/blob/master/doc/boot_sectors.txt says: --------------------------------------------------------------------- ... Apple Partition Map (APM) ... Sources: http://mjg59.dreamwidth.org/11285.html http://opensource.apple.com/source/IOStorageFamil...

...t; 00000010 : 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > > 16 : 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 > > My own cheat sheet: > > https://dev.lovelyhq.com/libburnia/libisofs/blob/master/doc/boot_sectors.txt > > says: > --------------------------------------------------------------------- > ... > Apple Partition Map (APM) > ... > Sources: > http://mjg59.dreamwidth.org/11285.html > http...

Hi, Gene Cumm wrote: > it seems the stack format got > set, changed, then mostly reverted back, with this code being the last > piece missing from 2009. The commit to isohdpfx.S of 2009-05-31 looks incomplete. The sequence of the stack pointers was swapped, but the sequence of stack pushes was not.