Re: [avr-gcc-list] Placing variable at absolute memory locations

[Henrik Maier]

Dave,

This creates a pointer to a specific memory location but does *not* 
allocate the memory. The linker will still place other variables into 
this memory space.

What I actually want to achieve is reserving a memory space from 0x100 
onwards by allocating an absolute variable or a memory block in a C 
source file. I like to explore if there is an option of doing this 
_without_ using any linker option by putting some kind of attribute into 
the C source file. I checked the gcc manuals but could not see anything 
alike, so I assume there is none.

The alternative solution is moving the .data/.bss section after my 
special memory space or creating a section and advising the linker of 
it's position.

But I just wanted it to be confirmed by somebody more familiar with 
avr-gcc that there is not option of doing this in C only.

Dave Hylands wrote:
> Hi Henrik,
>
> On 9/9/05, Henrik Maier <address@hidden> wrote:
>
> > Is there any way to place a variable [in my case an array of char] at an
> > absolute position using just C statements ?
>
>
> You could just do:
>
> char *buffer = (char *)0x1000;
>
> This would work for any pointer to a structure.
>
> I don't recommend this because you need to ensure that the C compiler
> didn't put something else there.