SPARC BSP CLOCK_SPEED was Re: Why RTEMS timeslice is not as configured.

[Joel Sherrill]

Awesome!! That was one of the ideas I recall being mentioned!!!

Asking a general question now. For sparc BSP users, any ideas
on how to override CLOCK_SPEED without modifying the BSP.
Currently this is a value in start.S.

One thought would be to add a configure time BSP option.
I think other BSPs have used linker variables which can be
overridden at link time.

Ideas?

On 8/14/2013 2:35 PM, Fernando Nicodemos wrote:
> Guys,
>
> Problem solved.
> I forgot to configure the register in the right way, exactly with the 
> correct oscillator value. In this case our board use a 24MHz external 
> oscilator. ERC32 core and system runs at 12MHz with this oscillator. 
> So the function the configure this is:
>
> #include <stdint.h>
> #include "hardware.h"
> #include <bsp.h>
>
> void hardware_setup(void)
> {
>
>   CLOCK_SPEED =
> 12
> ; // <---- use the right ERC32 core clock value here
> (half from external oscilator)
>
>   /* approximately 1 us per countdown */
>   ERC32_MEC.Real_Time_Clock_Scalar  = CLOCK_SPEED - 1;
>   ERC32_MEC.Real_Time_Clock_Counter =
> rtems_configuration_get_microseconds_per_tick();
>
>   ERC32_MEC_Set_Real_Time_Clock_Timer_Control(
>       ERC32_MEC_TIMER_COUNTER_ENABLE_COUNTING |
>         ERC32_MEC_TIMER_COUNTER_LOAD_SCALER |
>             ERC32_MEC_TIMER_COUNTER_LOAD_COUNTER
>     );
>
>     ERC32_MEC_Set_Real_Time_Clock_Timer_Control(
>       ERC32_MEC_TIMER_COUNTER_ENABLE_COUNTING |
>             ERC32_MEC_TIMER_COUNTER_RELOAD_AT_ZERO);
>
> }
>
>
> Thanks to all
>
>     Regards
>
>
>     *Fernando G. Nicodemos*
>     /Diretor de Pesquisa e Desenvolvimento
>
>     /**®*NCB - Sistemas **Embarcados Ltda.*
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>
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>
>     2013/8/14 Chris Johns <chrisj at rtems.org <mailto:chrisj at rtems.org>>
>
>         Fernando Nicodemos wrote:
>
>             Guys, problems solved.
>
>             We forgot to change the right clock value in linkcomands.
>             Our board works on 12MHz in the core.
>
>
>         Well done. It may pay to post to the list this.
>
>         Chris
>
>
>


-- 
Joel Sherrill, Ph.D.             Director of Research & Development
joel.sherrill at OARcorp.com        On-Line Applications Research
Ask me about RTEMS: a free RTOS  Huntsville AL 35805
Support Available                (256) 722-9985

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