# Debug Info for SDCard init (custom board rtl8735B SOC)

**URL:** <https://forum.amebaiot.com/t/debug-info-for-sdcard-init-custom-board-rtl8735b-soc/3402>\
**Category:** Peripherals\
**Tags:** rtl8735b\
**Created:** [October 8, 2024, 9:50am UTC](https://forum.amebaiot.com/t/debug-info-for-sdcard-init-custom-board-rtl8735b-soc/3402 "2024-10-08T09:50:31Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![andf](https://avatars.discourse-cdn.com/v4/letter/a/58956e/32.png) [@andf](https://forum.amebaiot.com/u/andf)\
**Post date:** [October 8, 2024, 9:50am UTC](https://forum.amebaiot.com/t/debug-info-for-sdcard-init-custom-board-rtl8735b-soc/3402/1 "2024-10-08T09:50:31Z")

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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)