[syslinux] [PATCH] ifmemdsk.c32: Allow boot options based on presence of MEMDISK

[Bernd Blaauw]

Op 8-8-2011 19:33, Shao Miller schreef:
> I don't follow. For the 'memdisk iso' scenario, INT 0x13, AH==0x08
> MEMDISK probe isn't going to work, as only the AH==0x4X functions
> work... So I would agree that one or both of '--mbfts' and
> '--safe-hooks' must be used in order to detect the MEMDISK. Nothing will
> "show" without '--info'.

As memdisk/ifmemdsk.c32 can detect it's currently being booted by 
Isolinux these options could be implicit instead of a 'nothing 
specified, nothing done'.

my very commandline for testing, inside the inner iso, was a:
/isolinux/ifmemdsk.c32 yes -- no
(followed by waiting for 'yes not found' or 'no not found')

as that wasn't a succes I expanded it to:
/isolinux/ifmemdsk.c32 --mbfts yes -- no

> So how about a '--find' option?:

sounds good.

> LABEL test1
> COM32 ifmemdsk.c32
> APPEND --mbfts --find test1 echo.c32 Found test1 -- echo.c32 No test1
> LABEL test2
> COM32 ifmemdsk.c32
> APPEND --mbfts --find test2=foo echo.c32 Found test2=foo -- echo.c32 No
> test2=foo
>
> Does that seem sensible? I'll probably wait for some hpa-approval of the
> current, basic incarnation before attempting a '--find' feature.

I'm confused by your test2 label, but in general it looks good yes.
Ideally I'd stick to a single config file but doubt it's possible as the 
"IF.." / "KERNEL" modules/keywords can only execute programs and labels, 
not keywords.

COM32 /isolinux/ifmemdsk.c32 --mbfts fdos -- showmenu

I'll stick to whatever works though, hopefully including a MBOOT.C32 at 
some time that is able to set root before chaining :)
Switching to GRUB/Grub4dos/BURG/GRUB2/GRUB24DOS/BURG2 in either 
uncompressed or compressed versions wasn't my intention :)

> - Shao Miller

Bernd