[syslinux] isohybrid question
Thomas Schmitt
scdbackup at gmx.net
Sun Mar 14 00:30:08 PST 2010
Hi,
the topic of LBA ambiguity in boot images needs
more examination. I confused patching the MBR
with patching isolinux.bin.
The original El-Torito/ISOLINUX code in libisofs
is not by me. So i have to learn better now.
I see the following occasions in libisofs
where LBAs are written into ISOLINUX objects:
- The El-Torito record gets the LBA of the
boot catalog.
(No address ambiguity involved.)
- The boot catalog gets the LBA of isolinux.bin.
(Is that catalog involved in MBR booting ?)
- The boot image gets the LBA of the PVD at byte
offset +8 and its own LBA at +12.
At least the third occasion might be a problem
with MBR booting.
Will the two addresses be used only relative to
/dev/sdb or might at some point the LBAs be
interpreted relative to /dev/sdb1 ?
Have a nice day :)
Thomas
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