I would ask for the procedure to enable UART1

I add port->line number at serial.c
Do you mean to change this line at ./arch/mips/vr41xx/common/serial.c?:
int vr41xx_serial_ports = 0;

In my kernel tree I have these 'serial.c':
$ find -name serial.c
./arch/mips/vr4181/common/serial.c
./arch/mips/vr41xx/common/serial.c
./drivers/usb/gadget/serial.c

Only in ./arch/mips/vr41xx/common/serial.c I found a port.line statement:
port.line = vr41xx_serial_ports;
And some lines avobe the value for vr41xx_serial_ports: int
vr41xx_serial_ports = 0;

Changing that value will enable UART1 ?
Thanks,
Carlos
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