[Gta04-owner] Kernel 3.14-rc5 for GTA04

Belisko Marek marek.belisko at gmail.com
Fri Mar 7 20:14:04 CET 2014


On Fri, Mar 7, 2014 at 6:00 PM, Dr. H. Nikolaus Schaller
<hns at goldelico.com> wrote:
>
> Am 07.03.2014 um 17:41 schrieb mx4812 at arcor.de:
>
>>
>>
>>>> Did you check if the delay loop is correctly calibrated?
>>>> Somewhere the kernel says: "Calibrating delay loop" and prints out
>>>> some value: lpj=11969856
>>>
>>> here is the 3.14 kernel
>>> [    0.001495] Calibrating delay loop... 594.73 BogoMIPS (lpj=2973696)
>>>
>>> and here the 3.12 kernel
>>>
>>> [    0.000274] Calibrating delay loop... 319.48 BogoMIPS (lpj=1597440)
>
> And the SD card with the 3.12 kernel on the board where I did test the 3.14:
>
> [    0.000305] Calibrating delay loop... 334.23 BogoMIPS (lpj=1671168)
>
> So there is a small difference - as expected. But not the factor 2.
>
>>
>> I remember from previous notebooks that I used that such timings also had the tendency
>> to get messed up after resume events (slugishness and slooweerr soouunnd aaoouutpuut).
>
> Interesting!
>
> It may also explain why the OTG port is detecting a cable but not working. If some clock
> is not initialized correctly it is simply not running the USB protocols correctly.
>
> What makes me wonder a lot is why it is different at all.
>
> It is the same hardware and the same message right at the beginning of a fresh boot (not
> even a resume).
>
> And I have not found a significant patch or diff to 3.12.7 - where it works.
>
> The only difference is that we now boot with device tree and have no board file
> (well, we use the board-generic.c instead of board-gta04.c).
I don't think it's caused by bogomips. Booting with sme devicetree
work fine on linux-next (without our
changes).
>
> But I *assume* that since the device tree works on other OMAP3 boards
> (e.g. BeagleBoard), that it should not be the reason.
>
> Another change could be in the kernel config.
>
> BR,
> Nikolaus
>
>
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BR,

marek

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