Lpc2000

--- In lpc2000@yahoogroups.com, "paloalgodon" <stevef@t...> wrote:
>
> I admit I'm a little disappointed about getting no replies on this 
> one.  Looking over the exisiting .ld files I have, it would appear 
to 
> be less than an hour's work (?).  I just figure, why re-invent the 
> wheel, when there's probably a bunch of *tested* copies running 
around 
> (especially when I'm a newbie).  I was actually suprized that 
there 
> wasn't already a complete set of .ld files for all the lpc parts 
in the 
> files section of our group.  I understand that .ld files are 
typically 
> customized a bit, just like makefiles, but a straightforward one 
that 
> runs from rom and calls global ctors would be fine for most 
beginners, 
> I would think.  I will certainly post if/when I get one 
> working...course that could be counterproductive if we're trying 
to 
> keep all the folks used to having the hard stuff done for them 
(WinAVR) 
> off of our list <wink><wink>
> 
> Steve
>

I don't think anyone is hiding the file, it's just that other tools 
than GNU use a different approach.  Perhaps the .ld just isn't 
around right now.

So, grab James Lynch's tutorial from 
http://www.olimex.com/dev/pdf/ARM%20Cross%20Development%20with%
20Eclipse%20version%203.pdf and note that there is a process for 
converting LPC2106 linker script (name *.cmd in the tutorial) to the 
LPC2148.

Basically, you are just defining the size of flash and ram, 
specifying an address for each and then assigning .text, .data 
and .bss to the appropriate memory type.  There are a couple of 
other symbols like _end, _bss_end and end (not defined in the 
tutorial but required for sbrk and malloc).

The end of my 2106 file looks like
...
/* RTS - changed alignment for malloc() - was ALIGN(4) */

	. = ALIGN(8);						/* 
advance location counter to the next 32-bit boundary */
	_bss_end = . ;						/* 
define a global symbol marking the end of the .bss section */
}
	_end = .;						
	/* define a global symbol marking the end of application RAM 
*/
PROVIDE (end = .);						/* 
for sbrk	*/

That's about it.

Richard