[syslinux] Sysinux 6 will not boot ISOs on BIOS (i.e. pre-UEFI) systems
Michael D. Setzer II
mikes at kuentos.guam.net
Wed Nov 27 02:53:49 PST 2013
On 26 Nov 2013 at 9:08, H. Peter Anvin wrote:
Date sent: Tue, 26 Nov 2013 09:08:50 -0800
From: "H. Peter Anvin" <hpa at zytor.com>
To: For discussion of Syslinux and tftp-hpa
<syslinux at zytor.com>
Subject: Re: [syslinux] Sysinux 6 will not boot ISOs on BIOS (i.e.
pre-UEFI)
systems
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> On 11/26/2013 06:52 AM, Gerardo Exequiel Pozzi wrote:
> >>
> >> Yes. I done the rebuild, but I can not test just now (enconding
> >> video!). I will post the result in ~10 hours ;)
> >
> > Yes! Fixed :)
> >
> > I tested at LBA 65536 (~128M) and 655360 (~1280M) and works fine in
> > both cases.
> >
> > The big mistery is why this works in some machines and why fails in
> > others. (maybe garbage in high word of "edx"?)
> >
>
> Awesome, *thank you* for testing!
>
I have two questions on this.
1. I generally use the released versions, but did make the change to the file
and ran the make to build the updated files. For some reason, my recompiled
version was about 5K smaller than the original one? Not sure why that would
be.
2. On a side note, I noticed that there are other mov statements in the
program that move values to the 32 bit registers. Would it be best to make
the same changes to those moves as well, or is this the only place that it is a
rare issue? How much of a difference is it in the code size from using the
regular move and the version with the zeroing.
> -hpa
>
>
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Michael D. Setzer II - Computer Science Instructor
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