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The basic device tree change for enabling sdmmc3
https://forums.developer.nvidia.com/t/microsd-card-not-detected-on-jetson-nano-production-module/80776/14 -
if sdmmc speed is slow. you need the patch here
https://forums.developer.nvidia.com/t/slow-sd-card-access-speed-read-write-with-jetson-nano-production-module/111749/31 -
if tires warm boot, the speed becomes slow again. Need to add this patch in kernel
https://forums.developer.nvidia.com/t/jetson-nano-sd-card-enters-back-to-high-speed-mode-instead-of-uhs-mode-after-soft-reboot/119041/4 -
if you don’t have SDMMC_VDD_EN gpio on their carrier board, then need to add “nvidia,vmmc-always-on” under sdhci device tree.
And lacking of (4) is a bad design that may have side effect.