[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [ARM:PATCH v1 1/1] Add Odroid-XU (Exynos5410) support
On Tue, 2014-07-29 at 08:49 -0700, Suriyan Ramasami wrote: > On Tue, Jul 29, 2014 at 12:30 AM, Ian Campbell <Ian.Campbell@xxxxxxxxxx> > wrote: > > On Mon, 2014-07-28 at 15:25 -0700, Suriyan Ramasami wrote: > >> So, why is any other CPU other than CPU0 not able to read the CNTFRQ > >> register? Is my CPU turn on code causing this issue, or is something > >> extra needed to be done to the other CPUs in the bring up code? > > > > Are you sure you are writing CNTFRQ on every pCPU? This is a processor > > local register so it needs setting everywhere, not just once. > > > Ah! I didn't know that. I was setting it only once on the booting CPU > in u-boot through am smc call. All cp registers are always local. At least I can't think of an exception offhand. > > You symptoms are sounding very much like it is only set on the boot CPU. > > > Thanks for pointing this out. I am wondering if I should go the psci > route for the Exynos 5410 or add an smc call in the cpu bring up code. PSCI would certainly be preferable if it is available for your platform. A basic PSCI framework got added to u-boot mainline just this week, if that is helpful. Ian. _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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