Pi Zero fails to enumerate Realtek 8152B ethernet adapters #3310
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An additional note: I have one RTL8152B adapter (included in a hub, design differs from any of the others) that does work reliably. I already visually compared the PCBs, but couldn't find any difference that sticked out. Anyway, the majority of RTL8152B adapter designs shows the reported flaw with the Pi Zero, while they work fine with any other computer I tried. |
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I have a RTL8152 and tried cold booting (overlay FS, so it's fine), but didn't have any enumeration failures yet. Have you gotten this error recently on the newest Raspbian? |
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@FD- : did you ever find a solution/workaround for this? I'm having same exact problem on a Pi Zero also.
are you able to tell what is that adapter you had success with? |
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It seems the Raspberry Pi Zero has problems with USB ethernet adapters that use the Realtek 8152B chip. More specifically, the adapters cannot be enumerated in a large fraction of boots, if the adapter is connected before the Pi boots. When enumeration fails, the kernel boot log shows:
(This is from a combined hub + RTL8152B ethernet adapter)
Full dmesg (click to expand)
Full lsusb when enumeration **fails** (most boots) (click to expand)
Full lsusb when enumeration **works** (few boots or if connected after / at late stage of boot) (click to expand)
What speaks agains this being a fault of the specific dongle or Pi I use:
How to reproduce the bug:
The error shows on most boots, but not all of them. I found this procedure is most likely to lead to the error:
5a. Cut the Pi's power, wait 5 seconds, power up again, goto 5
Please note I'm using a read-only image in my production setup, so cutting power on a default image is just used for the purpose of chasing this bug.
Expected behaviour:
I'd expect RTL8152B based adapters to correctly enumerate at all boots.
Actual behaviour:
RTL8152B based adapters only enumerate correctly in about 2-3 out of 10 boots.
Setup:
Used image: Newest Raspbian Lite image (2019-09-26) from RPi website (tried older ones as well)
Used kernel: Linux raspberrypi 4.19.75+ #1270 Tue Sep 24 18:38:54 BST 2019 armv6l GNU/Linux (also tried with older kernels)
Tested Pis: Pi Zero, Pi Zero W
Power supplies: Tested 2 different supplies + powering hubs (if they had a barrel connector socket)
Connection: RTL8152B connected to Pi via USB OTG adapter (tested 3 different ones) and optional hub (tested 3 different chips + no hub).
What I have tried:
I tried a bunch of different USB-related kernel settings and USB quirks, all to no avail. Please note I could only apply the quirks to the hub that sat between Pi and RTL8152B, since obviously the kernel can only apply quirks after it knows what device it’s dealing with, ie enumeration succeeded.
Please let me know if there are any more kernel flags or experiments you want me to try!
If you're willing to investigate this issue, I can send you one of these failing adapters. Just tell me what address to send it to.
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