Date: Sat, 17 Aug 1996 20:09:42 +0200 (MET DST)
From: Mark Habersack <grendel AT ananke DOT amu DOT edu DOT pl>
Reply-To: grendel AT ananke DOT amu DOT edu DOT pl
To: "Alaric B. Williams" <alaric AT abwillms DOT demon DOT co DOT uk>
cc: djgpp AT delorie DOT com
Subject: Re: Creating Boot Code with DJGPP
In-Reply-To: <840229058.29274.3@abwillms.demon.co.uk>
Message-ID: <Pine.NEB.3.95.960817200517.7548A-100000@ananke.amu.edu.pl>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII

On Fri, 16 Aug 1996, Alaric B. Williams wrote:

>"Sam Phillips" <sphillips AT sphillips DOT reno DOT nv DOT us> wrote:
>
>>I was wondering if there was a way to create some code to put into a boot
>>sector, and then after having it is there a painless method to put the code
>>in the bootsector.
>
>This sounds similar to something I was trying... a boostrap written
>with as that loads a 'kernel image' from disk, engages pmode, and
>jumps to it. This kernel image would be constructed from a COFF file.
>
>I looked at how Linux did it, and it used some wierd ld switch I'd
>never seen before, and my DJGPP ld didn't like it.
But the *real* startup code is still written in 16-bit ASM, right? And the
image produced by ld with the switch is a relocated ELF image (I think).
Linux GCC produces ELF objects that can be used as shared libraries. AFAIK,
COFF doesn't support that kind of image (don't quote me, but I think it is
so).
On second thought, isn't there in ld an option to create ROM images (I mean in
the script language for ld)? This would do the trick.

 >
>How do I create a code image, prelocated for a specific base address,
>that can be just loaded and jumped to???
>
See above.

Mark

/************************************************************/
/** Maybe it was infatuation or the thrill of a chase?   **/          
/** Maybe you were always beyond my reach and my heart **/
/**   was playing safe?                     ***********/ 
/** But was that love in your eyes I saw, **/
/**   or the reflection of mine?        **/
/** I'll never really know for sure,  **/
/** You never really gave me time!  **/
/** Won't you give me that time?  **/ 
/**          "Cindirella Search" **/
/********************************/
Visit my homepage: http://ananke.amu.edu.pl/~grendel