[ECOS]Strongarm rtc and oscr
Jonathan Larmour
jlarmour@redhat.com
Tue Feb 13 09:05:00 GMT 2001
Andrea Acquaviva wrote:
>
> I want to measure eCos multi-threading energy costs. I use it on the
> assabet board.
Have you looked at the tm_basic kernel test?
> In order to measure context switch overhead, I need some infos about
> timeslicing:
>
> - the option CYGNUM_KERNEL_SCHED_TIMESLICE_TICKS refers to 3.6864MHz
> clock ticks?
Yes.
> - How does eCos use real time clock (RTC) and operating system timer
> (OSCR) of
> StrongARM 1110?
An interesting question because we are considering changing the way it
operates right now! The interesting part is in
hal/arm/sa11x0/var/current/src/sa11x0_misc.c and hal_clock_rest() and
hal_clock_read(). Currently it resets it to 0 each interrupt, but we may be
about to change it to make it a freerunning counter.
Jifl
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