Re: stand-alone binary

From: SFD (sfd_at_adelphia.net)
Date: 08/30/04 

Date: Mon, 30 Aug 2004 14:58:55 -0400

"Norm Dresner" <ndrez@att.net> wrote in message
news:dyKYc.534065$Gx4.358845@bgtnsc04-news.ops.worldnet.att.net...
> "SFD" <sfd@adelphia.net> wrote in message
> news:S42dnfWrnLMSxK7cRVn-qQ@adelphia.com...
> > I'm trying to create a stand-alone binary file that can be executed
before
> > boot.
> >
> > Is there a way to do this in C, or does it need to be done in assembly?
> >
> > If it needs to be done in assembly, can it be assembled under Unix to be
> > stand-alone binary?
> >
> > I'd like to be able to print a simple message.
> >
> > Any examples, docs, references would be much appreciated.
> >
> > Thanks
>
>
> Before boot, there is no file system so there are no shared libraries
> available -- static linking would be your only option. Also there are no
OS
> services so you don't have std-in/our/err channels either, your only
choice
> is to directly address the hardware which makes your program totally
> unportable, possibly even between similar machines with different
> accessories. It could be done in C -- a language that's often called a
> "high-level assembly language" though much I/O may have to be done in ASM
if
> your particular library doesn't provide the routines necessary to do
direct
> hardware I/O.
>
> What are you trying to do that a simple sign on the machine wouldn't
> accomplish?
>
> Norm

What I'm trying to do is create a boot cd and if it is in the drive when
system boots, a message displays.
It can either display the message or cat a text file.

I found a file type that works on boot up, I just am not sure how to create
this type of file:

 # file output
    Microsoft a.out separate pure segmented standalone word-swapped V2.3
V3.0 86 small model executable

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