SD card is not detected with customized carrier board

Autonomous Machines Jetson & Embedded Systems Jetson Nano
,
1

Hi,

We designed a jetson nano carrier board with an SD card slot.

After inserting the SD card, we get logs as follows and SD card is not detected.

mmc1: CMD CRC or end bit error, int mask 0xc0001
mmc1: card nerver left busy state
mmc1: error -110 whilst initialising SD card 
mmc1: card nerver left busy state
mmc1: error -110 whilst initialising SD card 
...

Any advice to identify the cause of the problem?

3

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 your sdmmc speed is slow. Please check the max clk limit here
https://forums.developer.nvidia.com/t/slow-sd-card-access-speed-read-write-with-jetson-nano-production-module/111749/31
3. After warm boot, the speed becomes slow again. You 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
4. Also, for those who do not have SDMMC_VDD_EN gpio on your carrier board, then need to add “nvidia,vmmc-always-on” under sdhci device tree too.