[ECOS] CYGNUM_HAL_RTC_PERIOD / floating point

[Jonathan Larmour]

David N. Welton wrote:
>>You can find the CYGNUM_HAL_RTC_NUMERATOR aloingside the period
>>option in the pcmb package. If you reduce the period by a factor of
>>100, reduce the numerator by a factor of 100.
> 
> 
> Tried that, and things still seem to not work quite right.  I guess
> I'll keep experimenting and see what I can find.

Of course too fast, and you would be swamping the machine with interrupts 
- it may be spending all its time handling them!

Also check the docs for the timer chip. It may not be able to go that 
fast. Should, but may not.

>>Then in the code use a test like:
> 
> That works.  Shall I try and create a patch out of it?

Please do.

> One more thing - I try and set up a floating point variable in my
> cyg_start, and that seems to futz things up but good.
> 
> I had a look in the mailing list archives, and tried a few things like
> turning off the lazy FPU switching, but to no avail.
 >
> This is, as usual on a standard i386 PC booting from floppy.

386DX? 386SX has no FPU. Does FPU work outside of cyg_start in threads?

Jifl
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