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How to check if u-boot exists in a linux device

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I am trying to remove u-boot on an embedded device to reduce boot time. The platform I am working on is jetson Nano B01 I have followed the instructions to flash without u-boot but I don't know how to check if the process succeeded

I tried checking version but those commands fail...

strings /dev/mtd0 | grep U-boot
sudo grep -a --null-data U-boot /dev/mmcbllkboot

fail with no such file found type of errors.

Is that confirmation that uboot doesn't exist? if not what can I do?

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