Implementation of Uboot code for Console redirection via serial

I am using Uboot as my boot loader.

Actually here I want to do console redirection through USB port.

So that I have to modify console redirection via serial code to console redirection via of USB

To do that first I want to know how serial console redirection is done in the UBOOT code.
i.e., how in uboot the "serial console redirection" is implemented.

For console redirection(serial) there should be some code, somewhere in the UBoot.
I want to know how and where(in file,in which function) the console redirection is implemented.
[I have found how the configuration is done for console redirection]

Thanks
yaso

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