[ECOS] ROMRAM application runs much slower than RAM

[Harshit Suri]

Platform is based on AT91EB40a. Our clock frequency is different. I have
changed the clock freq and real time clock period settings accordingly.
Yes cache is enabled. When I built the .ecc file for ROMRAM, I copied
the .ecc for RAM startup and used it as my base. and changed the
relevant settings to make it ROMRAM.

Gary Thomas wrote:

>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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