Meaning of LED blinking

[pintman]

Hi!

I installed picore on a RaspberryPi 3 and wonder what the blinking of the LEDs means. The red Power LED seems to be on when there is nothing going on and turns of if the CPU has some workload. The green activity LED on the other hand blinks now and then - maybe it has something to do with the networking?!

Can anyone point me to some clarification about this blinking?

Thanks für help.

[Rich]

Hi pintman

In the later models (A+, B+, Pi 2 & Pi 3) the power LED is slightly more intelligent. it is connected to the 5V and will flash if
the voltage drops below 4.63V.

From:
https://www.raspberrypi-spy.co.uk/2013/02/raspberry-pi-status-leds-explained/

[pintman]

Thank you for the link. Therefore, I assume that no modifications have been made for the picore distribution to change the default behavior?

[Rich]

Hi pintman
The blinking suggests to me that your power supply voltage is dropping too low when you make the Pi do some work. Could
be a weak power supply or maybe excessive wire length between the Pi and power supply.

[Misalf]

The green LED mostly indicates reads/writes to the µSD card.
It's used to indicate other things as well. Like blinking 10 times when the RPi shuts down or different "blink-codes" to indicate things like boot errors. Like "beep-codes" on traditional PCs.
I believe the OS doesn't have much control over the status LEDs or it would be pointless anyway, because the LEDs are controlled by the hardware/firmware to indicate hardware stuff.

[bmarkus]

You can modify how LED(s) are working in config.txt or via /sys/class/leds For details read

https://monkeyinmysoup.gitbooks.io/raspberry-pi/content/5.2-leds.html

[pintman]

Thanks for you answers. I powered the Pi with a Powerbank - maybe this could be the source of an error and lead to the blinking of the red LED.

I thought that picore boots into RAM completely. Therefor I was surprised to see the green LED blinking.

[bmarkus]

I thought that picore boots into RAM completely. Therefor I was surprised to see the green LED blinking.

piCore itself runs in RAM but by default extensions are loop mounted and not copied to RAM.

[pintman]

Thanks for clarifying the loop-mount. Is it possible to boot extensions into the RAM, too?

When using a power plug instead of the powerbank the red LED now stays red.

[Juanito]

yes, you can use the copy2fs flag