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Hey PCW,

thanks for the quick reply. Ok, I'll plan on a shorter cable.

However, just to test things out, wouldn't slowing SPI (and if necessary by a lot) help with any ringing and similar transient issues? Or am I missing something? I can only imagine strong crosstalk that would actually causes glitches between SCK and MOSI/MISO to be an issue at slow speeds - and that is surely not expected @ 20cm as it would still be way too short for that?

If you agree, would reducing the rate as I did in spi_boards.c (max in spi_boards_init) work or are there other things that would prevent such an approach?

What does

ip a

report?

I have seen a similar issue when the network GUI used was wicd
which breaks Ethernet connections when setting up a WLAN
(network manager works, wicd is broken or was broken)