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Altera_Forum's avatar
Altera_Forum
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20 years ago

Access linker symbol from .C file

I'm trying to access a linker symbol from my C file. The idea is to find out where the end of my code and R/O memory is in flash so I can use the remainder for storage. I have the following in my...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
20 years ago

Ok, I'll answer my own question. To access a linker symbol that's out of reach use the following code:

extern int __ram_rodata_end[];

printf("%x\n", __ram_rodata_end);

That'll print out the same value you'll see in the .map file. The trick is to use an array declaration which forces GCC to use full-range addressing.

Thanks to David Brooks on comp.arch.embedded for the answer.

Andrew