Jetson nano SD card can use,but kernel prompt error

Autonomous Machines Jetson & Embedded Systems Jetson Nano
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3

Hello,

  1. 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

  2. If you notice the mmc speed is slow, please try this patch.
    https://forums.developer.nvidia.com/t/slow-sd-card-access-speed-read-write-with-jetson-nano-production-module/111749/31

  3. Some other forum users notice if tring warm boot, the speed becomes slow again. Turns out this patch is also needed 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

  4. Also, for those who do not have SDMMC_VDD_EN gpio on their carrier board, then need to add “nvidia,vmmc-always-on” under sdhci device tree too.

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