change bootloader log output to another pin

[A.Binder]

Hi!

I'm using IDF version v4.1-dev-1086-g93a8603c5-dirty.

My ESP is connected to an other microcontroller via UART0 (IO1/IO3), so I have to redirect LOG outputs to UART 1, IO15. I have changed the settings in menuconfig and it works.
But how can I redirect the LOG output of the bootloader? Bootloader still prints to UART 0, IO1 but the other microcontroller is not amused about this data.
Is there a way to redirect bootloader output to UART1, IO15 or is the only way to completely disable bootloader logs?

Thanks in advance,
astrid