Question about OS/2 booting

[Fred Heitkamp]

I've been trying to find out why Grub will not boot
my OS/2 MCP 4.52 installation.  The boot managers
Airboot and OS/2 Bootmanager do.  Some folks on
the comp.os.os2.* groups tell me that OS/2 needs
the string 'I13X' at segment 30H, offset 0   (0030:0000)
stored in memory before it will boot.  At least the
latest version of OS/2 that can use LVM seems too
need this. I've looked through the Grub source code
and I can't see anything obvious about where to check
for this feature or where to add it, if it does not
exist.

Does anyone know if Grub stores this string for OS/2
booting?

BTW what it really does AFAIK is check the BIOS to
see if the I13 extensions are present, and if so
writes that string to memory.

Thanks!

Fred