External SD card over SDIO interface

[K4ktus]

I tried to add microSD card reader over SDIO interface to my Pi 3 B+.
I connected everything according to this tutorial
https://ralimtek.com/raspberry%20pi/ele ... y_sd_card/
and added

Code: Select all

dtoverlay=sdio,poll_once=off

to my config.txt.
Pi works fine until I plug the SD card in.
When I do it, it's never detected and after about 5 seconds Pi hangs.
Holding ALT+PrintScreen and typing REISUB on keyboard does nothing, so I suspect kernel panic.
I disabled wifi with

Code: Select all

dtoverlay=pi3-disable-wifi

in config.txt to make sure it won't interfere.
Any ideas what might be wrong?

[thagrol]

Any ideas what might be wrong?

Using a tutorial from December 10, 2016? That's two and a half years, several updates and at least one OS version upgrade out of date.

I don't have a link to a more recent tutorial so best hit your favourite search engine.

[K4ktus]

I already did that and didn't find anything recent covering that. This is why I post it here, where people such as Pi engineers can tell me if it even has any chance to work.

[thagrol]

My apologies but it would have been useful if you'd mentioned that