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Re: [avr-gcc-list] Storing variables in external memory - suggestions

From: Dave Hylands
Subject: Re: [avr-gcc-list] Storing variables in external memory - suggestions
Date: Sat, 23 May 2009 09:14:32 -0700

Hi Nayani,

Replying to the list this time as well.

On Sat, May 23, 2009 at 3:24 AM, Parthasaradhi Nayani
<address@hidden> wrote:
> Hello David Kelly,
> I tried as you mentioned and seems to work fine. One more question is, how to 
> know the address ranges used by WinAVR? so one can use the unused ranges for 
> external EEPROM, FLASH etc. Thank you.

I'm not David Kelly, but I know the answer...

They're in the linker script.

The simplest way is to the following from the command line:

avr-gcc -mmcu=atmega8 -Wl,--verbose

Replace the atmega8 with the particular chip you're interested in.

The output of this will contain the following near the top:

 text      (rx)   : ORIGIN = 0, LENGTH = 8K
 data      (rw!x) : ORIGIN = 0x800060, LENGTH = 0xffa0
 eeprom    (rw!x) : ORIGIN = 0x810000, LENGTH = 64K
 fuse      (rw!x) : ORIGIN = 0x820000, LENGTH = 1K
 lock      (rw!x) : ORIGIN = 0x830000, LENGTH = 1K
 signature (rw!x) : ORIGIN = 0x840000, LENGTH = 1K

Those are the addresses used by the linker.

Dave Hylands
Shuswap, BC, Canada

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