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