OVMS3-idf/examples/peripherals/sdio/slave/main/Kconfig.projbuild

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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