Syslinux - Sep 2008 - Add CONFIGISOLINUX, CONFIGSYSLINUX, CONFIGEXTLINUX and CONFIGPXELINUX

I would like to see that it is possible to specify which config file should be
loaded.
I would like to have an extension of the CONFIG command. Normally CONFIG loads
the file that is specified after it. It should be nice if
syslinux/isolinux/pxelinux/extlinux can choose which config file to load, based
on the bootloader from which the current config is runned. If

I will explain it with an example, to clarify things.
Ultimate Boot CD (UBCD) is provided in an iso form which contains an
isolinux.cfg in /isolinux and a syslinux.cfg in /syslinux.cfg which both load
main.cfg (/ubcd/menus/main.cfg).

UBCD also contains a script which places the contents of the iso on an usb thumb
drive and make it bootable.

=======| main.cfg |  (small part of the main.cfg config file of Ultimate Boot
CD)
=======DEFAULT menu.c32 
PROMPT 0 
 
F1 /ubcd/menus/pmagic1.hlp 
F2 /ubcd/menus/pmagic2.hlp 
 
LABEL - 
MENU LABEL System 
KERNEL menu.c32 
APPEND /ubcd/menus/system.cfg 
 
LABEL - 
MENU LABEL CPU 
KERNEL menu.c32 
APPEND /ubcd/menus/cpu.cfg

LABEL - 
MENU LABEL Parted Magic V3.0 (LiveCD) - Press F1 for more information 
CONFIG /pmagic/isolinux.cfg 
 
LABEL - 
MENU LABEL Parted Magic V3.0 (LiveUSB) - Press F1 for more information 
CONFIG /pmagic/syslinux.cfg

================================================================
Like you can see, for Parted Magic there are 2 entries. The config files
(isolinux.cfg and syslinux.cfg) of Parted Magic are not the same so we can't
use just one config file.

Because main.cfg gets loaded by isolinux.cfg and syslinux.cfg, it should be nice
when isolinux knows that is has to load the isolinux.cfg file of Parted Magic
and that syslinux knows that is has to load the syslinux.cfg file of Parted
Magic whitout to have 2 separate items in the menu

I suggest one of the following options for the config files:

========| Method 1 |
========LABEL - 
MENU LABEL Parted Magic V3.0 - Press F1 for more information
CONFIGISOLINUX /pmagic/isolinux.cfg
CONFIGSYSLINUX /pmagic/syslinux.cfg
CONFIGPXELINUX /pmagic/pxelinux.cfg
CONFIGEXTLINUX /pmagic/extlinux.cfg

===========================================================================
========| Method 2 |
========
LABEL - 
MENU LABEL Parted Magic V3.0 - Press F1 for more information
CONFIG isolinux=/pmagic/isolinux.cfg syslinux=/pmagic/syslinux.cfg 
pxelinux=/pmagic/syslinux.cfg  extlinux=/pmagic/syslinux.cfg

e.g.: If UBCD is booted from a FAT partiton with syslinux, it should load
/pmagic/syslinux.cfg when selecting Parted Magic.

I think that it isn't difficult to implement.

Thanks in advance,

Gert Hulselmans