[Freedos-user] freedos 1.2 | creating modified ISO image with mkisofs

[Andre M. <and...@hi...>]

Hello

I am new to FreeDOS and would like to ask for any helpful hint how to 
create an modified ISO image from the actual FreeDOS version 1.2.

My "aim" is simple - based on the FD12LGCY.iso image to create a 
bootable DOS ISO image with BIOS firmware upgrade software (DOS based).

I found several how-tos on the web, but they are all based on the old 
FDOEMCD or FDOEMCD.builder.zip by using isolinux. In the end I was able 
to create with mkisofs (on MacOSX from homebrew) some bootable ISO 
image, but it was not helpful, as I could not access on the prompt my 
included BIOS firmware upgrade software. Instead of using the standard 
isolinux boot image,  I referenced also the boot.img from the 
FD12LGCY.iso and was able to have the DOS prompt, but again I could not 
access my included BIOS firmware software, which should be included as 
far as I understand in boot.img. Unfortunately the boot.img from 
FD12LGCY.iso is read-only and from FD12LITE.zip has not space left.


So my question is:

- How can I build a boot.img from FD12LGCY.iso or from FD12LITE.zip that 
includes my BIOS firmware software?

- And how ca I build with mkisofs from a folder including all 
"requisites" from the actual FreeDOS version 1.2 (without the installer 
packages) a boot able ISO image (analogous to FD12LGCY.iso) without 
using isolinux?

I would appreciate any hint. best regards.