[ECOS] ROMRAM application runs much slower than RAM

Gary Thomas gary@mlbassoc.com
Sun Feb 6 12:29:00 GMT 2005


On Sun, 2005-02-06 at 01:42 -0800, Harshit Suri wrote:
> Hi
> I've built an application code both in ROMRAM startup and RAM startup mode.
> The code blinks LEDs.
> 
> The ROMRAM application runs *significantly* slower than the RAM
> version. The time between LEDs blinks is much longer in ROMRAM. I've
> generated the delays using 'for' loops like so:
> 
> while(1)
> {
>      LEDs ON;
>      for (delay = 0 ; delay <100000;delay++);
>      LEDs OFF;
>      for (delay = 0 ; delay <100000;delay++);
> }
> 
> All parameters like clock frequency and RTC settings are same in both.
> 
> This puzzles me. Both startup modes finally run from RAM.
> 
> Then why this disparity in speeds?
> thanks

It's hard to tell with so few details.

What's the target platform?
Are you sure that caches are enabled in the ROMRAM configuration?

-- 
------------------------------------------------------------
Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
------------------------------------------------------------


-- 
Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss



More information about the Ecos-discuss mailing list