Does an external EMMC function on Xavier NX or Jetson Nano? JP4.6

[vK-embedded]

Since 16GB isn’t enough for my use on Jetson Nano or Xavier NX Production Module, I want to know if an external EMMC is supported by either of them.

Currently I’ve supplied 3.3V to the data lines(for the external emmc)do I need to change it to 1.8V for jetpack 4.6?
I’ve tried alot of the suggested properties for sdmmc3 in the forums. Haven’t found a solution, so I thought I’d generalize the question.

Thanks,

[kayccc]

@vK-embedded

if an external EMMC is supported

No, you can try to connect the NVME SSD.

[vK-embedded]

I understand there is a ssd slot on the devkit but,

I’d like to put forward a few points

1. This is not the devkit, I have my own custom carrier board where an emmc is connected to sdmmc3 @ bus width=4
2. In my understanding, the data transfer of a sd card is similar to emmc, why would it not work?

Thanks

[kayccc]

That’s related with the bootstrap and boot process, the external eMMC on carrier board desgn is not supported.

[vK-embedded]

Alright,
One last confirmation.

I do not want to boot up from the external emmc, I need it to act as an external storage.

Are you saying that wouldn’t be possible? Could you please explain why? its a 4 lane emmc.

Thanks.

[WayneWWW]

If you just want to enable one extra emmc on your board, then it is possible.

However, there is no validation that emmc would work on sdmmc3 from our side. But I know there are some other users trying this before.

[vK-embedded]

Would the data lines have to be at 1.8v or 3.3v?
Does the new JP support legacy speeds at 3.3v?

[WayneWWW]

Hi,

Please check the device tree of the original emmc node. It will tell you what would be supported.

I mean the first built-in emmc device.