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AM4378: AM4378BZDNA800S secure boot can not work

Part Number: AM4378

Dear,

I used Sitara Processors AM4378BZDND800, based on TI   PROCESSOR-SDK-LINUX-AM437X  Linux processor SDK for AM437x  development.

Now I use  AM4378BZDNA800S testing.  After testing, it was found that the uboot and Linux systems could not be started normally, is this related to the secure boot?

If the secure boot causes the normal startup, how do I disable the secure boot?

Or how to use the secure boot function, getting the system to boot properly?

Does the latest version of the SDK support secure boot? If supported, can you provide instructions for using secure boot?

Or how can we revise the software of our own product?