[syslinux] How is a isohybrid --partok image to be used ?

[Thomas Schmitt]

Hi,

H. Peter Anvin:
> It means that the .iso can be booted from a partition using any of the
> standard MBRs (not necessarily altmbr),

But the --partok MBRs (isohdpp*) stem from altmbr ?

If so: don't they need the partition number patched in ?

(If not: i have to rethink the link to article "Mbr" at
  http://www.syslinux.org/wiki/index.php/Isohybrid#MBR_selection
)


> One of the main uses is for backup partitions -- often distros want a
> filesystem that cannot be written for that, and iso9660 fits the bill.

Are examples known ?

Up to now i have to stay quite vague in
  http://www.syslinux.org/wiki/index.php/Isohybrid#Images_prepared_with_--partok

"==Images prepared with --partok==
 ISO images, which were prepared by --partok resp. with
 MBR isohdppx*.bin, have to be copied to a partition device.
 E.g. /dev/sdb1 rather than /dev/sdb.
 Such an ISO partition may then be booted by chainloading or
 by a suitable MBR at the start of the base disk device.
"

I hope this is at least not wrong.
Whatever, it would not suffice for myself to really create such
a disk or USB stick. (Courageous experimenters wanted.)

---------------------------------------------------------------

Further i wonder how --partok does play with --gpt.
Afaik, there is no equivalent to VBR in GPT.
So can it be that GPT in the ISO image is useless if the image is
put into a partition ?
Does the installing user have to compute an own GPT entry from a
listing of the GPT in the image ? (Or from the MBR patition table
in the image.)


Have a nice day :)

Thomas