[OpenWrt-Devel] [PATCH 2/2] lantiq: Fix status LED on TDW89X0 after boot is completed.

John Crispin john at phrozen.org
Mon Apr 25 09:14:31 EDT 2016

On 22/04/2016 09:13, Vittorio G (VittGam) wrote:
> On 22/04/2016 08:34:41 CEST, Mathias Kresin wrote:
>> Am 21.04.2016 um 23:43 schrieb Vittorio Gambaletta (VittGam):
>>> After recent patches, the status LED on this router would stay
>>> switched off after boot is completed. A switched off status LED
>>> often indicates a boot failure (eg. kernel panic), so fix this and
>>> get back to the previous behaviour.
>> NAK
>> This change was intentional. Personally, I don't like the idea of
>> using the WPS led as permanent (running) status led. I've never tried
>> it, but I may be possible to use WPS with hostapd and show the status
>> of the WPS action using the WPS led. I like to prevent such a double
>> use of leds.
> Well, personally I think that the WPS LED on this router should be used
> as a "permanent" system status LED, since the power LED is hardwired to
> the power supply, and there is no other status LED to be used. Since the
> WPS LED is unused by default on OpenWrt, I think it's better to use it
> as full system status LED, to avoid "dying" visually on first boot when
> no DSL or Wi-Fi is configured. This is the same behaviour we have on the
> TP-LINK MR3020 for example: the System LED in OpenWrt (which stays on
> after boot) corresponds to the WPS LED as it was used in the original
> firmware.
> Also, if things haven't changed, you need to write custom scripts to use
> the WPS LED to indicate WPS status. And if you do customize your OpenWrt
> install with such scripts, and you want the LED to default to off
> instead of on when WPS is not being used, you can just add a section for
> the WPS LED in /etc/config/system with "option trigger 'none'" and
> "option default '0'" to have it switch off after boot is finished.
>> The basic idea was to let the WPS led blink as long as the device
>> boots and switch it off at the time the boot has finished. Which means
>> an unsuccessful boot is indicated by a still blinking WPS led.
> Nope. If there is a kernel panic, all the GPIO LEDs will stop blinking
> and get switched off. At least when it happened to me it was like this,
> but it was some years ago so I might not remember well (or maybe things
> have changed and the kernel does not stop hardware-assisted LED blinking
> on panic

i understand the problem, but the WPS led is for WPS and should be left
free for the WPS feature eventually. so nack on this one i am afraid.

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