[syslinux] Fair warning regarding the future of the COM32 format
H. Peter Anvin
hpa at zytor.com
Wed Aug 30 17:11:10 PDT 2006
Hi all,
I just want to give everyone a heads-up that I'm considering removing
support for COM32 in favour of relocatable (-fPIC) ELF files, or some
other relocatable format. This would allow one "ELFCOM" file to call
out to another, and then return.
Part of the idea here is to run the main syslinux UI and probably the
filesystem drivers in "ELFCOM" code, which doesn't work too well with
everything being statically linked to a fixed address.
The other option, which I am also considering, is to do the same thing
by playing games with segments. This would break COM32 files which rely
on touching fixed addresses (which most of them currently do), but would
otherwise be a relatively straightforward operation. If I do that, I'll
introduce a standard GDT which would have flat segments as well as
fixed-offset ones, but you'd still have to convert pointers before
passing them to something. It's not clear to me at this time which way
is better, although I think I am leaning toward the former.
-hpa
More information about the Syslinux
mailing list