Feature Request: Boot get stuck while external UART connected (Move u-boot UART to ttyS6)

[hrnycze]

Feature Description

Hello, I need some help.
In my project, it is required to have a free UART (ttyS2) to communicate with FCU.
Now the boot get stuck, because ttyS2 is used as the debug console of the boot loader (u-boot).
I moved the kernel debug console to ttyS6, but still pre-kernel (bootloader) in on ttyS2, which is blocked by FCU.

Can I rebuild the boot loader? I found variable CONFIG_BASE_UART=0xfeb50000. What is the right approach to make it work?

Thanks