[LinuxBIOS] Timer frequencies
Marc Jones
marc.jones at amd.com
Fri Oct 5 18:10:27 CEST 2007
Myles Watson wrote:
> I got Bochs to fail the same way the hardware (my Tyan s2892) fails when
> I turned down the timer tick interrupt frequency. I’m having trouble
> finding the place where the timer gets set up. (Grepping for
> time,rtc,timer,hz, etc.)
>
>
>
> Can someone tell me where I can make the interrupts come at 100 Hz in
> LinuxBIOS?
>
>
>
> Thanks,
>
> Myles
>
I believe that you are looking for calibrate_tsc() in
cpu\x86\tsc\delay_tsc.c. That only sets up channel2. No reason you
couldn't make changes in your mainboard but I'm not sure the setting
will stick. I would expect the linux kernel reprogram the PIT (maybe not
if it is using ACPI timer or HPET)?
Marc
--
Marc Jones
Senior Firmware Engineer
(970) 226-9684 Office
mailto:Marc.Jones at amd.com
http://www.amd.com/embeddedprocessors
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