It turns out SDMMC3 on the Jetson Nano module is wired to respective pins of the carrier's M.2 Key E socket. However, it is not enabled. I see no reason why. This block is functional and has a fixed 1.8 V I/O supply. Perfect for SDIO cards nowdays. I think it would make sense to enable this feature. PCIe could be used for something else. Kind regards, Tamas Tamás Szűcs (1): arm64: tegra: Enable SDIO on Jetson Nano M.2 Key E arch/arm64/boot/dts/nvidia/tegra210-p3450-0000.dts | 13 +++++++++++++ 1 file changed, 13 insertions(+) -- 2.20.1