Kernel Boot Time Optimization

how to disable Console over UART of NX R32.4.4?
Edit p3668.conf.common to remove the specification console=ttyTCU0,115200n8 console=tty0.But it can’t work?
Should change Linux Cmdline in Cboot?

Here is a URL which might be of use:

Note that any time you remove the arguments to the Linux kernel for the serial console, then this applies to the moment when Linux actually runs. Sometimes that information for the command line is simply via the “/boot/extlinux/extlinux.conf” file, but such information can also be from a device tree in a partition.

Prior to the Linux kernel running you have to realize that the bootloader software is itself a separate program which runs before Linux ever starts. Depending on the Jetson model and release this might imply trying to remove serial console messages from CBoot or U-Boot.