problem in thumb mode

Hi,

I are facing performance related issues in my ARM project, I am using th

ATMEL AT94M55800 ARM7 chip, I planned to go for the thumb mode but it 
GCC (3.3.2) dose not seem to compile properly in thumb mode.
I have tried with -mthumb -mthumb-interwork option as some code need to b
in
arm mode. Do you guys know how to do this.

Secondly dose gcc have any linker option that can load an object in t
flash
but run from RAM.If you know any performance improvement methods on AR
let me know.

Regards,
Anand

 



		
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AnandPavaskar wrote:
> Hi,
> 
> I are facing performance related issues in my ARM project, I am using the
> 
> ATMEL AT94M55800 ARM7 chip, I planned to go for the thumb mode but it 
> GCC (3.3.2) dose not seem to compile properly in thumb mode.
> I have tried with -mthumb -mthumb-interwork option as some code need to be
> in
> arm mode. Do you guys know how to do this.
> 

Make a minimal example and post it here. At least 3.2.1 and 3.3.4
do work with my projects. What goes wrong?

> Secondly dose gcc have any linker option that can load an object in to
> flash
> but run from RAM.If you know any performance improvement methods on ARM
> let me know.

Use the function attribute 'section' to locate the code into
an initialized data section. You may get linking overflows
due to the maximum reach of a bl instruction (23 bits). If so,
make the calls indirect: create a pointer to the function and
use the pointer in the call.

Remember to modify the linker script to include the new
section into the proper place. (You do have one for
your hardware?)

HTH

-- 

Tauno Voipio
tauno voipio (at) iki fi