How to set verbosity to Debug for bootloader?

To understand the bootloader detail, I want to set verbosity to Debug.
How can I gain that?
some setting in ./bootloader/t186ref/BCT/tegra234-mb1-bct-misc-p3701-0000.dts?

It depends on what kind of bootloader you want to check.

There are lots of bootloader components in jetson boot flow.

Only UEFI can enable debug log.

How in detail?

You will get two binaries after building UEFI source code.
Flash the device with the one called DEBUG instead of RELEASE.

Thanks. That is to say, no single config item to make its verbosity Debug.?

No such thing.

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