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RE: [avr-gcc-list] Howto put constants on fixed address

From: Weddington, Eric
Subject: RE: [avr-gcc-list] Howto put constants on fixed address
Date: Thu, 20 Dec 2007 08:51:26 -0700


> -----Original Message-----
> From: 
> address@hidden 
> [mailto:address@hidden
> org] On Behalf Of Stu Bell
> Sent: Thursday, December 20, 2007 8:43 AM
> To: address@hidden; address@hidden
> Subject: RE: [avr-gcc-list] Howto put constants on fixed address
> You're going to need to become a real expert in linker 
> scripting to even
> come close to doing this.  Joerg & company might be able to help with
> this.  Also, using either cygwin or linux, do an "info ld" to find out
> more on how to do linker scripts.

Note that the Binutils (and hence ld) user manual is include in WinAVR
if the OP is using that.

> My feeling is that you are asking quite a bit too much from the linker
> to expect it to "flow" code around an obstacle in the middle of it's
> memory map.  If you want to set up two sections, before and after "my
> section" and assign code to each, you could succeed.  But as it is, I
> don't think the linker comprehends a single section that comes in two
> pieces.

This changes the whole design philosophy, as most users want to know
when there is a conflict, i.e. overlapping segments, not to tell the
linker to wrap around something.

Perhaps there is some magical linker flag that will allow this. Somehow
I doubt it. And I agree with Stu, the alternative is to move your
section to a different location, or magical linker scripting.

> I'm not sure why you insist that it *must* be in the middle of your
> code, but that's for you to know and decide.

Yeah, enquiring minds would like to know...

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