silrtos port on ARM

Hi i guess the first thing that you have to do is implement a interrup timer. Which will be utilized for sechduling and other timing pupose.

Have you compiled silRTOS for the ARM9? Is it a C code? Do u have boot loader ready?

I'd never heard of silRTOS so am interested to see what it is like. I found it through Google but download link is broken.

Did you consider FreeRTOS.org?

Speaking of FreeRTOS

Atmel AT91SAM7S256.... using the AT91SAM7S64 stuff

in the context load for ARM, is it not 'incorrect' to load R0-R14 in the context switch since your using SUB PC [LR -#4]

The stacks for the tasks all have pattern data in R0-R14 prior to first run. I changed it to [LR-#13] to leave the link register alone [R14] and the return worked correctly. Am I missing something?

No.

The pattern data in R0 to R14 are placed in the User mode stack by code running in Supervisor mode. Two different LR registers are being used.

Yes - probably you are not calling main() from Supervisor mode (or at least switching to Supervisor mode prior to starting the scheduler). This is a very common mistake, hence the comments warning you of this in the code, and the notes in red text on the documentation pages, and the FAQ :o)

ound