Re: [coreboot] Using High Speed UART1 as Serial port on CoreBoot (MinnowBoard)

[Adrian Perez Resa]

Hi Ben,

Many thanks for your reply, then I suppose the best option is the PCU UART
I'll continue with that

Thanks and best regards

Adrián

-----Mensaje original-----
De: Ben Gardner [mailto:[e-mail]] 
Enviado el: 19 April 2016 17:26
Para: Adrian Perez Resa
CC: [e-mail]
Asunto: Re: [coreboot] Using High Speed UART1 as Serial port on CoreBoot (MinnowBoard)

Hi Adrian,

You are better off hooking up to the "Serial Console" port and using that.
http://wiki.minnowboard.org/MinnowBoard_MAX

If you really want to use one of the HS UARTs, then you have a bit of work to do.
See src/drivers/uart/uart8250mem.c and note the use of CONFIG_DRIVERS_UART_8250MEM_32.
You'd need to implement something similar to src/soc/intel/skylake/romstage/uart.c, but for the E3800.
Not worth it, in my opinion, as the PCU UART works just fine.

Ben

On Tue, Apr 19, 2016 at 9:27 AM, Adrian Perez Resa  wrote:
> Hello everybody,
>
> I am newby with minnow board and CoreBoot.
>
> I am trying to use HIGH Speed UART1 as Serial port on CoreBoot 
> (SIO_UART 1
> pins) with no success.
>
> I have tried to configure CoreBoot with the following options:
>      Console > Index for UART port to use for console -> ‘0’
>
> o   Baud rate 115200
>
> But I don’t know exactly what serial port I am using…
>
> High speed UART 1 (SIO UART 1) is connected to JP1 Header in minnow Board.
>
> However, Serial port seems to be always on the default debug UART 
> (connector
> J4 on Minnow Board).
>
> This Debug UART is attached at ATOM GPIOS GPIO_S0_SC_57 and 
> GPIO_S0_SC_61 pins.
>
> Does anybody know what options are necessary to change for using a 
> different uart than the default one…?
>
> Thanks in advance!
>
> Best regards