RE: [ECOS] Simple Redboot Q's

["Matt Sartori" <msartori@hanoverdisplays.com>]

Yes, that all the jumps and references within the code are relative, not
absolute.
I think what I'm not quite understanding is what the load does. 
I would expect the loading of an elf to involve the interpretation of
the file as to where to put it (and probably other stuff), however
loading an elf explicitly to a location (with -b) doesn't make logical
sense to me since the elf already knows where it wants to go. 
Equally baffling to me is when I load a .bin to an explicit location
then I can't just run it from that location.
Only when I load the .bin into the same memory location as what I've put
in the binary's linker script does it work (yes, I've finally managed to
get it to run my code :) even if not quite sure why).

I apologize if this is basic stuff.

m@

-----Original Message-----
From: Andrew Lunn [mailto:andrew@lunn.ch] 
Sent: 26 July 2005 17:30
To: Matt Sartori
Cc: eCos Discussion
Subject: Re: [ECOS] Simple Redboot Q's


> >Unless your code is position independent (or very smart), this is 
> >most
> certainly your problem.
> 
> Ok, good. That's something I can look at then.
> Redboot, despite being a ROM build, says it's using RAM from
0x20000000
> to 0x20005b68, so I've made
> my linker script place CODE at 0x20005b68 and DATA at 0x20008000 (with
a
> total RAM range of 0x10000).
> This, I take it, is only significant if I load it as an elf. And,
again
> if I understand correctly, when loaded as -r it just goes where I put
> it.
> Obviously there's still something I don't understand correctly 'cause
it
> doesn't work. 

Find out what position independant means. The comments above make me
think you understand what this means.

        Andrew

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