[syslinux] [PATCH][git-pull] doc/syslinux.txt: CONFIG and LOCALBOOT

Gene Cumm gene.cumm at gmail.com
Tue Mar 1 10:01:36 PST 2011


On Mon, Feb 28, 2011 at 15:51, Jeff Sadowski <jeff.sadowski at gmail.com> wrote:
> What does localboot option -1 do?
> I was looking for any documents I could that display how to use
> localboot all I see is "localboot 0" (which I have used and from my
> understanding goes to the next boot option in the bios) in any docs I
> even did "find -type f -exec grep -Hni localboot {} \;" in the
> syslinux directory that i decompressed from 4.03
> and I don't see anything that looks to discuss it.

This kind of confusion is why I decided to try my hand at editing this
and hopefully make it clearer and more up to date.  See
http://git.zytor.com/?p=users/genec/syslinux.git;a=blob;f=doc/syslinux.txt;h=b6d3ec2dd01366c59e1039bb3a3a4e7ff73fb9e7;hb=844e23ab45df8396cabdeff43763fa95206bb672
starting at line 244.  As you can see, the file is doc/syslinux.txt.

-1 reports a boot failure to the BIOS.  If I recall correctly, there
are actually a few ways to go about doing so.  It appears INT18h is
used by everything first.  PXELINUX and ISOLINUX have a second fall
back of jumping to F000:0FF0h.  SYSLINUX will fall back to INT19h.

0 does not always mean boot next option.  For PXELINUX, it does.  For
ISOLINUX, it means boot the first floppy drive.

-- 
-Gene

> On Mon, Feb 28, 2011 at 1:29 PM, Gene Cumm <gene.cumm at gmail.com> wrote:
>> git://git.zytor.com/users/genec/syslinux.git
>>
>> Branch doc-syslinux-for-hpa
>>
>> Expand upon the explanation of the usage of CONFIG (including a new
>> directory).  Edit LOCALBOOT to include the fact that all variants
>> understand LOCALBOOT type -1.  Compact the PXELINUX section to one
>> paragraph.
>>
>> --
>> -Gene




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