Off-button reaction time

kyak bas at bmail.ru
Sat Aug 20 05:32:40 EDT 2011


Wow, wow, wow!

Just tried it with "/usr/bin/poke 0x10003024 0".
The reaction to On button is instantanious!!!

Xiangfu, how about putting this to our start script?
Bas, this is absolutely awesome, thank you!

On Wed, 17 Aug 2011, Bas Wijnen wrote:

> Andrea Bolognani schreef op wo 17-08-2011 om 12:17 [+0200]:
>> Hold on a second: either I’m utterly mistaken, or the kernel is still far
>> from being kicked in when the power button is pressed.
>
> That is correct. But the delay is made by the rtc, which can be set up
> when the kernel is running. It will retain its value as long as the rtc
> has power (that is, when you remove the battery, you lose both the
> current time and this setting).
>
>>  I always assumed
>> the circuitry needed that delay, and it was not avoidable.
>
> It is avoidable, and I don't see a reason to use it.
>
>> Are you telling me that I’ve been wrong the whole time, and that it is
>> possible to achieve instant—boot making changes to the software only?
>
> Yes. If the kernel sets the rtc register, it will instant-boot from then
> on, until the power on the rtc goes down (which should never happen).
>
> I propose to write the rtc register on every boot, so that even if the
> battery was removed and the setting was lost, it still only results in
> the delay once.
>
> I'm talking about register HWFCR, page 131 of the programmer's manual.
> Writing 0 to this register (0x10003024) will remove the delay.
>
> Thanks,
> Bas
>
>
>
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