[fpc-devel] How can I distribute code in two different memory areas? (.section)

Michael Ring mail at michael-ring.org
Sun Jun 2 22:41:13 CEST 2013

Hi, perhaps I am overseeing a simple solution for my problem:

On the pic32 there are two flash areas, one at 0x9d000000 for the main 
program and another at 0xbfc00000 that is called Boot Flash. On reset 
the program starts in the boot flash at the first address.

I have written the startup code for the chips now but I need to 
distribute some procedures between the two memory areas, for obvious 
reasons I must have some code at address 0xbfc00000 or the chip will not 
boot correctly ;-).

My thought was now to tweak the linker script in the same way the 
original linker scripts of pic32 work:

   kseg0_program_mem    (rx)  : ORIGIN = 0x9D000000, LENGTH = 0x80000
   kseg1_boot_mem             : ORIGIN = 0xBFC00000, LENGTH = 0x490

   .reset _RESET_ADDR :
   } > kseg1_boot_mem

In assembler I can then simply write:
  .section .reset,code and
  .section .reset.startup,code

and then the code, this will automagically end up in the kseg1_boot_mem, 
but this does not work with the inline assembler. Any ideas on how to do 
this the correct way? Is there something more intelligent than to write 
a plain assembler file?



PIC32MX FRM - Section 3. Memory Organization PIC32MX FRM - Section 3. 
Memory Organization
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