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

[Jeppe Græsdal Johansen]

Den 02-06-2013 22:41, Michael Ring skrev:
> 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:
>
> MEMORY
> {
>   kseg0_program_mem    (rx)  : ORIGIN = 0x9D000000, LENGTH = 0x80000
>   kseg1_boot_mem             : ORIGIN = 0xBFC00000, LENGTH = 0x490
> }
>
> SECTIONS
> {
>   .reset _RESET_ADDR :
>   {
>     KEEP(*(.reset))
>     KEEP(*(.reset.startup))
>   } > 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?
>
> TnX,
>
> Michael

You should be able to use
.section ".reset"
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