Hi @mttjcksn ,
Thank you so much for your interest in our products and for using our community.
I import an SDK demo "evkbmimxrt1170_sdcard_freertos_cm7", in this demo, There is USDHC driver available in the config tool.

IDE version: MCUXPresso IDE 25.6
SDK version: MIMXRT1170-EVKB 25.6
I think you can refer to this demo.
Wish it helps you.
If you still have question about it, please kindly let me know.
Best Regards
MayLiu