Hi,

On Thu, Aug 25, 2016 at 02:57:24PM +0800, Icenowy Zheng wrote:
> >>>>   diff --git a/arch/arm/boot/dts/sun8i-a33-inet-d978-rev2.dts b/arch/arm/boot/dts/sun8i-a33-inet-d978-rev2.dts
> >>>>   index 78823d8..3ac22d4 100644
> >>>>   --- a/arch/arm/boot/dts/sun8i-a33-inet-d978-rev2.dts
> >>>>   +++ b/arch/arm/boot/dts/sun8i-a33-inet-d978-rev2.dts
> >>>>   @@ -48,6 +48,10 @@
> >>>>            model = "INet-D978 Rev 02";
> >>>>            compatible = "primux,inet-d978-rev2", "allwinner,sun8i-a33";
> >>>>
> >>>>   + aliases {
> >>>>   + serial1 = &uart1;
> >>>>   + };
> >>>>   +
> >>>
> >>>  Is there any other UART in the system?
> >>
> >>  serial0 is defined in sun8i-reference-design-tablet.dtsi, as r_uart.
> >
> > If your board does not have r_uart pads, then the right thing to do
> > would be to disable it. You can then have uart1 as serial0.
> 
> I don't know it. The RX/TX is wired on PF2/PF4 on the board (UART0 muxed with
> MMC)

Then you don't support it and you need to disable it.

> But many codes will require a ttyS0 as console... So I think the
> bluetooth should be located at ttyS1...

Most of them would use /dev/console anyway. What do you have in mind?

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com