Debug Info for SDCard init (custom board rtl8735B SOC)

Hi,
is there an option to get debug output with sdcard board init?
we have custom board and SDCard does not seem to work.
our output:

$8735b>Register disk driver to Fatfs.
FATFS Register: disk driver 0
[SDHOST Err]Wait bus status (0x1f) timeout. Get: 0x0
[SDHOST Err]Last cmd: 11
hal_sdioh_init_card fail, try first
[debug]i = 0

Logic analyzer shows cmd 41 being sent and obviously the answer is not liked by the system.
How would I debug this?

regards

PS: requested NDA for sdk access to allow better debugging (I hope)