[gPXE] Booting FreeDOS - beginner question

[Ruzsinszky Attila]

> It is real eays to boot Linux from iSCSI. Ubuntu is able to recognize that
> you want to install it on a iSCSI-volume at the installation-process and
> will adapt the boot-parameter to boot from.
OK.

My goal is a working boot server with many different OSes, like
- some Linux distros
- some rescueCD-s (systemrescuecd, etc.)
- DOSes (M$ and Free)
- Win (XP, W7)
- maybe OS/2, FreeBSD.

> I recommend at least to use Ubuntu 11.04, but 11.10 should also be no
> problem.
I like Ubuntu 10.04.3 LTS. I hate Unity because I don't know how can I use it.

I'd like to know whether I can setup FreeDOS boot system using only Linux
utilities (dd, fdisk, mkfs.msdos, makebootfat, etc.) I hope it is possible.
If my image is correct checking with fdisk, no boot at all (from qemu).
If I use makebootfat, fdisk complains but qemu is able to boot from it. If
qemu is able to boot directly from my image not booting from the iSCSI.
What is the difference? I don't understand. I'm confused.

For boot server, almost everything is ready: DHCP+TFTP+WEB+Samba+
iSCSI server. What is missing a bootable image what I can put on iSCSI
server.

Mybe I don't understand many things, like exact booting from PXE, CD,
HDD, floppy. It is very complex for me. I know just very few things about them.

TIA,
Ruzsi