UNeverNo
Posts: 2
Joined: Sat Oct 12, 2019 7:59 pm

eth0 not initialized properly on startup/after reboot

Sat Oct 12, 2019 8:50 pm

After applying latest updates it seems that my raspberry 2 B 1.1 can't initalize the ethernet adapter properly, in fact there are only a couple of times when it doesn't fail on startup.

When I do a reboot, it almost always fails.
I also get some undervolting-messages although I'm just idling in terminal (I didn't observe this before).
Power supply #1: 5,23-5,26V @ 0,23A
Power supply #2: 5,13V @ 0,23A
Power supply #3: 5,07V @ 0,23A

OS: buster
Kernel: 4.19.75-v7+

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B.Goode
Posts: 8884
Joined: Mon Sep 01, 2014 4:03 pm
Location: UK

Re: eth0 not initialized properly on startup/after reboot

Sun Oct 13, 2019 7:20 am

Welcome to the Raspberry Pi forums.

UNeverNo wrote:
Sat Oct 12, 2019 8:50 pm
After applying latest updates it seems that my raspberry 2 B 1.1 can't initalize the ethernet adapter properly, in fact there are only a couple of times when it doesn't fail on startup.

When I do a reboot, it almost always fails.
I also get some undervolting-messages although I'm just idling in terminal (I didn't observe this before).
Power supply #1: 5,23-5,26V @ 0,23A
Power supply #2: 5,13V @ 0,23A
Power supply #3: 5,07V @ 0,23A

OS: buster
Kernel: 4.19.75-v7+


Your power supplies look under-specified.

See the tables published by Raspberry Pi here: https://www.raspberrypi.org/documentati ... /#pi-power

Product Recommended PSU current capacity Maximum total USB peripheral current draw Typical bare-board active current consumption

Raspberry Pi 2 Model B 1.8A 600mA/1.2A (switchable) 350mA

UNeverNo
Posts: 2
Joined: Sat Oct 12, 2019 7:59 pm

Re: eth0 not initialized properly on startup/after reboot

Thu Oct 17, 2019 10:23 am

B.Goode wrote:
Sun Oct 13, 2019 7:20 am
Your power supplies look under-specified.

See the tables published by Raspberry Pi here: https://www.raspberrypi.org/documentati ... /#pi-power

Product Recommended PSU current capacity Maximum total USB peripheral current draw Typical bare-board active current consumption

Raspberry Pi 2 Model B 1.8A 600mA/1.2A (switchable) 350mA
All power supplies provide up to 2A, which should be more than sufficient. 230mA just seems to be the value if nothing else happens on the pi.

Gooseman
Posts: 16
Joined: Mon Apr 16, 2012 5:08 pm

Re: eth0 not initialized properly on startup/after reboot

Thu Oct 17, 2019 10:35 am

I have seen problems in the past even with good power supplies (5.1V/2A) due to low-quality USB cables. Sadly also the USB Micro connector on either side (RPi and/or cable) can wear off with time and lead to increased voltage drop at power spikes. Being very short you do need more sophisticated equipment to see this, a multimeter is not enough. Try a shorter USB cable, maybe with higher cross section. I switched a some time ago to a Blitzwolf Ampcore cable and my problems went away.

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B.Goode
Posts: 8884
Joined: Mon Sep 01, 2014 4:03 pm
Location: UK

Re: eth0 not initialized properly on startup/after reboot

Thu Oct 17, 2019 10:35 am

I also get some undervolting-messages

If current from your unspecified power supplies is not the issue, maybe poorly-regulated voltage is? Perhaps the Voltage 'sags' at times of peak power demand?

This could be exacerbated by inadequate cabling causing a loss of power delivered to the board.

'Official' Raspberry Pi supplies do not have either of these issues.

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