Advanced users • Re: SDIO WiFi Card Enumeration Fails on Raspberry Pi 5 (But Works on Pi 4)

I carefully checked the logic analyzer again, and the LA of Raspberry Pi 4 is as follows：




The logic analyzer of Raspberry Pi 5 is as follows：



Waveform analysis
Raspberry Pi 4
CLK (pink) idle state: low level
Only generate pulses during transmission

Raspberry Pi 5
CLK (pink) idle state: high level
This is clock polarity reversal

May I ask why the above phenomenon occurs? After that, the Raspberry Pi 4 is normally enumerated, while the Raspberry Pi 5 is not。

Statistics: Posted by 88burden — Wed Nov 19, 2025 5:25 pm

---