Re: [Xen-devel] ARM, time: alternative of using udelay() before init time

[Oleksandr Tyshchenko <oleksandr.tyshchenko@xxxxxxxxxxxxxxx>]

On Mon, Oct 20, 2014 at 3:30 PM, Julien Grall <julien.grall@xxxxxxxxxx> wrote:
> Hi Oleksandr,
Hi Julien

>
> On 10/20/2014 11:12 AM, Oleksandr Tyshchenko wrote:
>> On Fri, Oct 17, 2014 at 7:22 PM, Julien Grall <julien.grall@xxxxxxxxxx> 
>> wrote:
>>>
>>> I'm wondering how Linux deal with the time when the timer is not
>>> initialized?
>>
>> If I understood correctly the udelay() can works before timer initialized.
>
> I gave a look to the Linux code and it looks like they have an
> implementation based on jiffies to used when the timer is not
> initialized. (see __loop_udelay in arch/arm/lib/delay.c).
>
> I'm not sure if it's relevant to do exactly the same. But we could
> implement a loop-based udelay when the timer is not correctly initialized.
Completely agree.

>
> Regards,
>
> --
> Julien Grall



-- 

Oleksandr Tyshchenko | Embedded Dev
GlobalLogic
www.globallogic.com

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