How to disable uart0 driver on esp32

[xtend-graz]

Hi,
I have a custom project with very tight need, and to meet the performance required I need to manage the bare UART hardware. Actually I succeded for Uart1 and Uart2. I need also to manage Uart0 so I disabled the related output, by setting CONFIG_ESP_CONSOLE_NONE=y in sdkconfig.
To confirm, after the boot I don't have any kind of log output to UART0.
But I have problems because seems that after I pick the char form the uart fifo, (only for uart0) something else does the same (and I'm sure is not in my code...), causing a wrong alignment in the fifo rx register.
I suspect is the driver ISR, but I don't know how to check if it is still loaded and eventually how to disable it.

Any suggestion about?

Thank you for any help or idea