[syslinux] Boot iPXE from syslinux/isolinux

[Christian Hesse]

Christian Hesse <list at eworm.de> on Tue, 2013/10/22 12:56:
> Gene Cumm <gene.cumm at gmail.com> on Tue, 2013/10/22 06:35:
> > On Tue, Oct 22, 2013 at 5:41 AM, Christian Hesse <list at eworm.de> wrote:
> > > Hello everybody,
> > >
> > > iPXE builds an ISO image by default. (The build system has to be updated
> > > for new paths and to integrate ldlinux.c32, but that's not my problem.)
> > >
> > > With the binary syslinux files from kernel.org booting fails with
> > > latest version 6.02:
> > >
> > > Loading ipxe.krn... ok
> > > Booting kernel failed: Invalid argument
> > >
> > > It does work with version 6.01, though. Any hints how to fix this
> > > regression?
> > 
> > I presume this is using the precompiled binaries from kernel.org?
> 
> Yes.
> 
> > If
> > using the same ipxe.krn works on 6.01 and fails on 6.02, another thing
> > to try is to narrow it down to a -pre release.
> 
> version 6.02-pre5 works, 6.02-pre6 does not.

Struggled with git bisect, but finally succeeded:

8f470e7bfe75f6401f6c5432988c620b863ad274 is the first bad commit
commit 8f470e7bfe75f6401f6c5432988c620b863ad274
Author: Matt Fleming <matt.fleming at intel.com>
Date:   Tue Jul 16 15:15:54 2013 +0100

    movebits: Add syslinux_memmap_find()
    
    Refactor the code for finding a suitable location for kernel
    protected-mode and real-mode data. It's complicated enough that it
    deserves to be separated into its own function.
    
    Signed-off-by: Matt Fleming <matt.fleming at intel.com>

:040000 040000 a7f3dc3f6ac34bd09336eff39e2f3d2d1bd8c9b6
3e4cbdfc3cb9928c5c809fc4400623eefbc398f4 M      com32
-- 
main(a){char*c=/*    Schoene Gruesse                         */"B?IJj;MEH"
"CX:;",b;for(a/*    Chris           get my mail address:    */=0;b=c[a++];)
putchar(b-1/(/*               gcc -o sig sig.c && ./sig    */b/42*2-3)*42);}
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