memory footprint

[Aaron J. Grier]

On Mon, Nov 25, 2002 at 05:40:12PM -0500, Wulf Hofbauer wrote:
> I'm experimenting with RTEMS on an MVME147S (68030) board. I
> previously assumed that only those RTEMS components actually
> referenced get linked into the executable image of an application.
> However, a completely empty application still yields about 62 kb of
> text and 2.3 kB of initialized data. The "hello_world_c" example
> weighs in at a similar size.
>
> That kind of overhead just doesn't look right to me.  What am I doing
> wrong here? I'm using the 20021118 snapshot, if that's relevant.

I suspect the majority of the overhead is from printf and libc.  add
-Wl,-t to your final link so you can see what objects are being linked
in.

> I also noticed that RTEMS cannot run from ROM as storage for the
> exception vector table and interrupt stacks are allocated in the text
> (!) section. What is the rationale for this?

bsp_start() doesn't copy ROM vectors to RAM?  (it does on 4.5.0)

-- 
  Aaron J. Grier  |   Frye Electronics, Tigard, OR   |  aaron at frye.com