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Linker script question
- From: Johannes Bauer <JB dot Imm at gmx dot de>
- To: "gcc-help at gcc dot gnu dot org" <gcc-help at gcc dot gnu dot org>
- Date: Thu, 04 Mar 2010 09:20:51 +0100
- Subject: Linker script question
I have a question regarding linker scripts. For a certain embedded MCU I
have 256k of Flash memory and 96k of RAM available:
FLASH (rx) : ORIGIN = 0x00000000, LENGTH = 256k
SRAM (rwx) : ORIGIN = 0x20000000, LENGTH = 96k
In the section definition I'd like to define a symbol which signifies
the end of the SRAM range, i.e.:
__ramend = 96k + __data_start__;
(where __data_start__ is laid out so it is starting at 0x2000000, i.e.
the beginning of the RAM section).
The way I'm doing this currently is by duplicating the "96k" value
explicitly. However, for easy maintenance it would be nice to have only
one symbol to change (as many devices in the same family behave exactly
the same and only the sizes of the memory differs).
I've tried to pass the ramsize to the linker using a define, but this
worked neither for the MEMORY definition nor for the __ramend definition
contained within SECTION.
Is there a way to refer to the previously defined LENGTH and ORIGIN
attributes within the SECTION definition, for example like (pseudo syntax):
__ramend = MEMORY_LENGTH(SRAM) + __data_start__;