Hi there,
In a nutshell, C6 includes a slave controller that conforms to SD card specs. providing some caveats
SDIO
ESP32-C6 series has only one SDIO slave controller that conforms to the
industry-standard SDIO Specification Version 2.0.
SDIO should be connected to specific GPIOs, namely SDIO_CMD, SDIO_CLK,
SDIO_DATA0, SDIO_DATA1, SDIO_DATA2, and SDIO_DATA3.
Please add a pull-up resistor to these GPIOs, and preferably reserve
a series resistor on each trace.
LP_GPIO is available in Sleep mode.
HTH
GL 
PJ 