Re: [coreboot] MMIO UART driver on OS

[Nico Huber]

Hi,

On 31.07.2016 17:07, Zheng Bao wrote:
> Hi, All,
>
> I want to add support MMIO UART support on OS.
>
> I checked the file pnp_uart.asl.
>
> For IO UART, a device with EisaId("PNP0501") is added into DSDT, the windows can detect the COM port in device manager.
>
> I am wondering if MMIO UART also have that convinient feature.

in theory (I've just checked the code, never tried) the Linux driver
supports MMIO UARTs too if you give it the same entry (PNP0501) with
a memory resource instead of the io ports.

Maybe this works in other OS' too?

Nico
> Or I need to build a driver for each OS?
>
> Thanks.
>
> Joe

MMIO UART driver on OS

[Marc Jones]

Hi Joe,

Have you tried making this change? Do you have any patches? Just currious,
but are you trying to set a debug port? I just started looking at the
microsoft dbg2 acpi field.

https://msdn.microsoft.com/en-us/library/windows/hardware/dn639131(v=vs.85)....

Marc

On Sun, Jul 31, 2016 at 2:19 PM Nico Huber  wrote:
> Hi,
>
> On 31.07.2016 17:07, Zheng Bao wrote:
> > Hi, All,
> >
> > I want to add support MMIO UART support on OS.
> >
> > I checked the file pnp_uart.asl.
> >
> > For IO UART, a device with EisaId("PNP0501") is added into DSDT, the
>
> windows can detect the COM port in device manager.
> > I am wondering if MMIO UART also have that convinient feature.
>
> in theory (I've just checked the code, never tried) the Linux driver
> supports MMIO UARTs too if you give it the same entry (PNP0501) with
> a memory resource instead of the io ports.
>
> Maybe this works in other OS' too?
>
> Nico
> > Or I need to build a driver for each OS?
> >
> > Thanks.
> >
> > Joe