On the LPC55S6x I am getting a response timeout after CMD 8 for the SD card is called.
alee1_0-1660071880404.png
It does not seem to be a hardware issue, because I used an oscilloscope to verify that a response is sent.
alee1_1-1660071956822.png
The dark blue waveform is the clock, and the dark pink is the response.