menu "Example Configuration" config SDIO_DAT2_DISABLED bool "Disable the DAT2 in SDIO slave" default y help SDIO slave DAT pin is unfortunately the same pin as MTDI, which controls the flash power voltage. For 3.3v flash devkits / modules / kits, it conflicts with the DAT2 pullups required by the specification. This disables the peripheral input from the DAT2 so that we can work in 1-bit mode when DAT2 is floating (pulled down). 4-bit mode is therefore unavailable. endmenu