Hi Loic,
> Loic Poulain <loic.poulain@xxxxxxxxx> hat am 14. September 2017 um 22:48 geschrieben:
>
>
> Contrary to other RPi devices, RPi3 uses uart0 to communicate with
> the BCM43438 bluetooth controller. uart1 is then used for the console.
> Today, the console configuration is inherited from the bcm283x dtsi
> (bootargs) which is not the correct one for the RPi3. This leads to
> routing issue and confuses the Bluetooth controller with unexpected
> data.
>
> This patch introduces chosen/stdout path to configure console to uart0
> on bcm283x family and overwrite it to uart1 in the RPi3 dts.
>
> Create serial0/1 aliases referring to uart0 ant uart1 paths.
> Remove unneeded earlyprintk.
>
> Fixes: 4188ea2aeb6d ("ARM: bcm283x: Define UART pinmuxing on board level")
> Signed-off-by: Loic Poulain <loic.poulain@xxxxxxxxx>
> ---
> arch/arm/boot/dts/bcm2837-rpi-3-b.dts | 5 +++++
> arch/arm/boot/dts/bcm283x.dtsi | 7 ++++++-
> 2 files changed, 11 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm/boot/dts/bcm2837-rpi-3-b.dts b/arch/arm/boot/dts/bcm2837-rpi-3-b.dts
> index 20725ca..f1c0811 100644
> --- a/arch/arm/boot/dts/bcm2837-rpi-3-b.dts
> +++ b/arch/arm/boot/dts/bcm2837-rpi-3-b.dts
> @@ -8,6 +8,11 @@
> compatible = "raspberrypi,3-model-b", "brcm,bcm2837";
> model = "Raspberry Pi 3 Model B";
>
> + chosen {
> + /* 8250 auxiliar UART instead of pl011 */
> + stdout-path = "serial1:115200n8";
> + };
> +
> memory {
> reg = <0 0x40000000>;
> };
> diff --git a/arch/arm/boot/dts/bcm283x.dtsi b/arch/arm/boot/dts/bcm283x.dtsi
> index 431dcfc..013431e 100644
> --- a/arch/arm/boot/dts/bcm283x.dtsi
> +++ b/arch/arm/boot/dts/bcm283x.dtsi
> @@ -20,8 +20,13 @@
> #address-cells = <1>;
> #size-cells = <1>;
>
> + aliases {
> + serial0 = &uart0;
> + serial1 = &uart1;
> + };
> +
looks good, but since the bcm2835-rpi-zero-w.dts also defines this, please remove it there.
> chosen {
> - bootargs = "earlyprintk console=ttyAMA0";
> + stdout-path = "serial0:115200n8";
> };
>
> thermal-zones {
> --
> 1.9.1
>
>
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