Messages in this thread | | | Date | Mon, 8 Jun 2009 07:43:43 +0200 (CEST) | From | Thomas Gleixner <> | Subject | Re: [PATCH] tick: add check for the existence of broadcast clock event device |
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On Mon, 8 Jun 2009, Feng Tang wrote: > > 1) How do you calibrate the local APIC timer if you do not have some > > initial timer device ? > Yes, we have external timer device with the name "apbt"
So that timer is initialized and registered before the local apic, right ?
Why is the local APIC timer used at all ? The apbt timer should have a higher rating as the local APIC timer, so when APIC is registered it is not selected and the check in the broadcast functions
!(dev->features & CLOCK_EVT_FEAT_C3STOP))
should protect you because that bit is not set on your apbt device.
Thanks,
tglx
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