Re: [Xen-devel] [ARM:PATCH v2 1/1] Pass the timer clock-frequency to DOM0

[Julien Grall <julien.grall@xxxxxxxxxx>]

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...

Regards,

-- 
Julien Grall

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