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From:   Arnd Bergmann <arnd@arndb.de>
Date:   Wed, 11 Mar 2020 15:31:24 +0100
Message-ID: <CAK8P3a12iN4HzN3HsRSBJPLpwJzdVwhrK7Mje0V6eW3Lvd77iw@mail.gmail.com>
Subject: Re: [RESEND PATCH] arm64: dts: specify console via command line
To:     Chunyan Zhang <zhang.lyra@gmail.com>
Cc:     SoC Team <soc@kernel.org>, Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        DTML <devicetree@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        Orson Zhai <orsonzhai@gmail.com>,
        Baolin Wang <baolin.wang7@gmail.com>,
        Chunyan Zhang <chunyan.zhang@unisoc.com>
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On Wed, Mar 11, 2020 at 12:21 PM Chunyan Zhang <zhang.lyra@gmail.com> wrote:
>

> diff --git a/arch/arm64/boot/dts/sprd/sp9863a-1h10.dts b/arch/arm64/boot/dts/sprd/sp9863a-1h10.dts
> index 2047f7a74265..510f65f4d8b8 100644
> --- a/arch/arm64/boot/dts/sprd/sp9863a-1h10.dts
> +++ b/arch/arm64/boot/dts/sprd/sp9863a-1h10.dts
> @@ -28,7 +28,7 @@
>
>         chosen {
>                 stdout-path = "serial1:115200n8";
> -               bootargs = "earlycon";
> +               bootargs = "earlycon console=ttyS1";
>         };
>  };

Hi Chunyan,

I would expect that you need to either specify the stdout-path, or the console=
kernel parameter, but not both.

If earlycon was used, shouldn't the driver know which port is the console?

      Arnd