Messages in this thread | | | Date | Sun, 10 Jul 2011 11:39:22 +0100 | From | Russell King - ARM Linux <> | Subject | Re: [PATCH V2 0/6] arm_smp_twd: mpcore_wdt: Fix MPCORE watchdog setup |
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On Wed, Jul 06, 2011 at 12:16:03PM +0100, Russell King - ARM Linux wrote: > On Wed, Jul 06, 2011 at 12:05:48PM +0100, Catalin Marinas wrote: > > On Wed, Jul 06, 2011 at 11:14:56AM +0100, Russell King - ARM Linux wrote: > > > Do we know why the calibration was initially introduced? FWIR, it came > > > from the SMP group in ARM, so I guess they had a reason for it rather > > > than copying x86. > > > > I think it was introduced because the TWD frequency is half of the CPU > > frequency but the latter may not be known - boot monitor configuration > > could change it. > > Okay, that implies we can't have a fixed frequency built into the kernel > then. For such platforms like the ARM dev boards (realview + vexpress), > I expect we can read the CPU frequency from somewhere like one of the > ICST PLLs.
So how do we do that? I see this as a blocker on these patches.
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