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[Bug ld/7031] New linker command file function: REGION_ALIAS

From: sebastian dot huber at embedded-brains dot de
Subject: [Bug ld/7031] New linker command file function: REGION_ALIAS
Date: 18 Nov 2008 09:15:48 -0000

------- Additional Comments From sebastian dot huber at embedded-brains dot de  
2008-11-18 09:15 -------
Hi Nick,

we could of course use the C pre-processor or a billion other tools to generate
a linker command file, but the linker should do its job without the need of
external tools.  The linker has already the capability to gather its linker
command file from various files via the INCLUDE function.  So I guess that
someone had in mind that you should be able to split the hole stuff into
general and specific parts.  One point against your single project solution is
that this feature might be useful for other projects too.

Lets consider a practical example for the PowerPC architecture: The MPC8313E
RDB has a huge RAM of 128 MB and the MPC5566 EVB has only a small RAM of 128 kB
but it can execute its code from a ROM.  The only difference (except RAM and
ROM dimensions) in the linker command files of these two boards is that in the
first case the code section goes into the RAM region and in the second case it
goes into the ROM region.  With the current linker command file facilities you
cannot provide a general part that may be used for both boards.  So now you
have the choice to generate it via external tools or enhance the linker command
file facilities.  The above example illustrates an every day problem for the
linker if you work with various boards.  So from my point of view we should
enhance the linker.

Have a nice day!



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