SD-Card as additional storage on RK3399

Hi guys,

I’m trying to use a SD-card as additional storage to my RK3399 because my board came with a 16GB eMMC.
The problem is that I’m getting stucked on boot (see picture below) if I insert my SD-card into the TFCard slot. If the system boots up without the sdcard everything is OK. I can insert the sdcard after the Ubuntu login and it gets recognized by the system.

How can I use a SD-card as additional storage? Can anyone help?

Thank you.

Power on the adapter no this problem, It seems only reset can reproduce.
Soft reboot is okay .

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