Using sdmmc3 on a custom carrier with TX2-NX

Autonomous Machines Jetson & Embedded Systems Jetson TX2
1

Hello

I’m trying to get the sdmmc interface working on a custom carrier board. The SoM in use is a TX2 with an onboard emmc.

I have change the status in override@2 to “okay”.

When I boot the system, in the kernel boot log contains this output:
[ 7.272535] mmc1: CMD CRC or end bit error, int mask 0xc0000 [ 7.279823] mmc1: CMD CRC or end bit error, int mask 0x40000 [ 7.287076] mmc1: CMD CRC or end bit error, int mask 0x40000 [ 7.294318] mmc1: CMD CRC or end bit error, int mask 0x40000 [ 7.301533] mmc1: CMD CRC or end bit error, int mask 0x40000 [ 7.308785] mmc1: CMD CRC or end bit error, int mask 0xc0000 [ 7.316059] mmc1: CMD CRC or end bit error, int mask 0xc0000 [ 7.323277] mmc1: CMD CRC or end bit error, int mask 0xc0000 [ 7.330483] mmc1: CMD CRC or end bit error, int mask 0xc0000 [ 7.337814] mmc1: CMD CRC or end bit error, int mask 0x40000

If I issue the following command more /sys/firmware/devicetree/base/sdhci*/status I see the following output

::::::::::::::
/sys/firmware/devicetree/base/sdhci@3400000/status
::::::::::::::
disabled
::::::::::::::
/sys/firmware/devicetree/base/sdhci@3420000/status
::::::::::::::
disabled
::::::::::::::
/sys/firmware/devicetree/base/sdhci@3440000/status
::::::::::::::
okay
::::::::::::::
/sys/firmware/devicetree/base/sdhci@3460000/status
::::::::::::::
okay

Naturally there is no device node.

I am not sure what is going wrong, has anyone ever managed to use sdmmc3 with a TX2? And could someone point me to the steps required to get the sdmmc3 to work with a TX2 please?

Thanks in Advance

Andrew

2

Is this TX2-NX or TX2?

I am not sure why you want to use such design.
What not just use sdmmc1?
TX2 already enabled sdcard on sdmmc1. The TX2 devkit already has one sdcard slot on sdmmc1.

3

Thank you for your reply.

The SoM is a TX2 NX.

The carrier is a custom design which uses sdmmc3.

Andrew

4

Ok, then please check this post.

1 Like
5

Thank you that has helped solve my problem.

I needed to set vmmc-supply = <&spmic_sd3>;

The SD card now mounts.

I need to add support to enable the card detect signal.

I’m assuing that needs to be done by setting cd -gpios

6

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