[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [ARM:PATCH v2 1/1] Pass the timer clock-frequency to DOM0
On Fri, Apr 11, 2014 at 9:32 AM, Julien Grall <julien.grall@xxxxxxxxxx> wrote: > Hello, > > On 04/11/2014 05:05 PM, Suriyan Ramasami wrote: >> On Tue, Apr 1, 2014 at 4:12 AM, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote: >>> On Fri, 2014-03-28 at 14:04 +0000, Julien Grall wrote: >>>> That made me think that this is the only board with this issue. I would >>>> definitely prefer to fix the clock frequency in U-boot. The bootloader >>>> should respect the ARM ARM (see B.8.1.1): >>>> >>>> "The CNTFRQ register is UNKNOWN at reset, and therefore the counter >>>> frequency must written to CNTFRQ as part >>>> of the system boot process." >>> >>> Yes, Suriyan, please exhaust this avenue of attack (fixing u-boot on the >>> platform) first. >>> >> Thank you gentlemen for your comments. >> The problem with this board is that the uboot is not entered in secure >> mode, and hence the mcr indstruction to set the ARCH timer frequency >> cannot be executed in u-boot. > > If so, what is the state of the CPU when it jumps to U-boot? > The CPU has to be either in secure mode or hyp mode. > AFAIK, if it's NS you won't be able to go in hyp mode, unless crash the > CPU... > The CPU is in HYP mode when it jumps to U-boot. Thanks - Suriyan > Regards, > > -- > Julien Grall _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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