I'm programming an XC161 with internal flash memory at 0xC00000..0xC1FFFF and external flash at 0x400000..0xBFFFF (only 0xBB0000..0xBFFFFF 256K is used for program/data - the rest is for a flash file system).
Currently when the code is linked, it starts linking to the external memory at 0xBB0000. I presume because the address of the external memory is lower than the internal memory.
I want the code/data to be loaded into the internal flash memory where possible but if/when the code/data can't fit into the 128K internal flash I want it to be stored in the external flash.
Is there simple* way to specify that all code/data should be linked to the internal flash memory unless it can't fit, which case it should go into the external flash memory.
* By simple, I mean without hardcoding addresses (in the linker) of where to link each source module.
Regards Paul
I'm not sure if this issue can be solved as simple as requested. We had a similar configuration and used the following approach:
- We seperated our code into "frequently called" and "less frequently called".
- The former went to the internal flash and
- for the latter we introduced a code class, e.g. named ECODE. In the corresponding sources (we used a memory model with far code) we put
#pragma RENAMECLASS(FCODE=ECODE)
- For the locator, we just specified
ECODE (0x400000-0x44FFFF)
So there is only one address hardcoded.
Thanks for the speedy reply Thomas. That's as good a solution as I was hoping for. I think it will suit our purpose very well :)