Re: packages to different memory sections

[Lars Poeschel <larsi@wh2.tu-dresden.de>]

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Am 23.11.2008 um 23:21 schrieb Martin Laabs:

> Hi,
>
> I have a board with a lpc2294. This processor has about 256kB of
> fast internal flash. However - this is not enough. At least while
> developement. I have plenty of flash at the external memory bus but
> it has many waitstates.
> Now I'd like to split ecos in two parts and say "HAL, Kernel and
> Math"-Package in the fast internal flash, "ISO-C, Fat, zLib etc."- 
> Packages
> into the slow external flash.
>
> Is this possible without too much handwork on the linker script?
> (So not add every symbol per hand to the coresponding section.)

I don't know a way that could do it without much handwork.

> And if not - does the gnu-ld linker support two sections of the
> same name or assignment of (i.e. the .text) segment to two differ-
> ent memory regions? (So that I could use as well the internal as
> the external flash for the .text segment.) The info page of ld
> was not very informative about that.

Yes, this should be possible although I never did that. Please read
http://sourceware.org/binutils/docs/ld/Scripts.html#Scripts
I think I would solve that by mapping the same input sections to two  
different output sections seperating them by filename. - not very nice  
but should work.

Derived from the example I would write something like:
SECTIONS { 	
	.text : { *(.text) }
	.text1: {library.o(.text)}
	.data : { *(.data) }
	.bss : { *(.bss) } }
}

Also see:
http://sourceware.org/binutils/docs/ld/Input-Section-Example.html#Input-Section-Example


Lars

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