UNIX for Dummies Questions & Answers

hello guys!

i found this thread [*] on the internet and registered right here in this community.

on a USB-drive i installed Debian. boot manager is GRUB 2 (1.99) [1]. in a folder within my Debian i have some ISO-images of some linux-distros and other live-systems. one of these is Parted Magic, which i can start via GRUB 2 with an menuentry in "40_custom" [2]. this works fine and i'm happy with it...

the only problem i have now is, that this way i can't enter Parted Magic's boot-manager [3] (SYSLINUX AFAIK). because of my menuentry in GRUB 2 [2], Parted Magic boots directly without accessing it's boot-manager.

in this way i can not:
my question is now: how can i access a boot-manager of an ISO (in Parted Magic's case SYSLINUX [3]) from GRUB 2 [1]?


as an alternative solution i could add all boot-menu entries from SYSLINUX to my GRUB 2 - BUT: this is a huge amount of work to do and with a newer version of this live-system maybe there will be other entries, so that i have to rework my GRUB 2-entries at every time, when a newer version comes out...

what i also tried (after i took the screenshot [1], so it's not to see on it now): i added a new partition on my USB-stick and placed (via "dd") the content of the Parted Magic ISO-image in this partition. with another menuentry [4] in my GRUB 2 i tried to came into the boot-manager of this new partition, but this also didn't work yet...


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[*]
unix.com/unix-dummies-questions-answers/132619-how-get-grub-launch-isolinux-syslinux-boot-menu.html
(i'm not allowed to add "real" URLs, because of new member restriction...)


[1]



[2]

Code:

menuentry "Parted Magic 2013-05-01" {
set isofile="/root/software/images/partedmagic_2013-05-01.iso"
loopback loop (hd0,1)$isofile
linux (loop)/pmagic/bzImage iso_filename=$isofile boot=live
initrd (loop)/pmagic/initrd.img

[3]



[4]

Code:

menuentry "Parted Magic 2013-05-01 from Partition" {
  insmod ext3
  set root=(hd0,3)
  chainloader +1
}