Newlib : Malloc & PPC

[Matthew Jones]

Quoting Frank Juergen-r58616 <Juergen.Frank@freescale.com>:

> Hi !!
>
> I have a problem with the malloc function of newlib. Possible someone 
> can help me out ...
>
> If I call malloc in my program it returns a value of 0, if I compile 
> the program with -msim (for the simulator). In case I compile the 
> same program for an real embedded system (PowerPc based evaluation 
> board). The system crashed if I call the malloc function.
>
> I didn't do anything special for malloc, so I'm wondering from where 
> the malloc get the info about the memory pool (size location etc). I 
> can imagine I should set these values in the linker script, but I 
> didn't found any info about this.

My understanding is this:

malloc() eventually calls sbrk() in libgloss.
sbrk() picks up _end from the linker.

You need to make sure _end is in the linker script, and points to free memory.

-- 
Matthew JONES
http://www.tandbergtv.com/