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From: Arnd Bergmann <arnd@arndb.de>
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>
Subject: Re: [RESEND PATCH] arm64: dts: specify console via command line
Date: Wed, 11 Mar 2020 15:31:24 +0100	[thread overview]
Message-ID: <CAK8P3a12iN4HzN3HsRSBJPLpwJzdVwhrK7Mje0V6eW3Lvd77iw@mail.gmail.com> (raw)
In-Reply-To: <20200311112120.30890-1-zhang.lyra@gmail.com>

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

WARNING: multiple messages have this Message-ID (diff)
From: Arnd Bergmann <arnd@arndb.de>
To: Chunyan Zhang <zhang.lyra@gmail.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
	DTML <devicetree@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Chunyan Zhang <chunyan.zhang@unisoc.com>,
	SoC Team <soc@kernel.org>, Rob Herring <robh+dt@kernel.org>,
	Baolin Wang <baolin.wang7@gmail.com>,
	Orson Zhai <orsonzhai@gmail.com>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>
Subject: Re: [RESEND PATCH] arm64: dts: specify console via command line
Date: Wed, 11 Mar 2020 15:31:24 +0100	[thread overview]
Message-ID: <CAK8P3a12iN4HzN3HsRSBJPLpwJzdVwhrK7Mje0V6eW3Lvd77iw@mail.gmail.com> (raw)
In-Reply-To: <20200311112120.30890-1-zhang.lyra@gmail.com>

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

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http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply	other threads:[~2020-03-11 14:31 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-11 11:21 [RESEND PATCH] arm64: dts: specify console via command line Chunyan Zhang
2020-03-11 11:21 ` Chunyan Zhang
2020-03-11 14:31 ` Arnd Bergmann [this message]
2020-03-11 14:31   ` Arnd Bergmann
2020-03-12  7:34   ` Chunyan Zhang
2020-03-12  7:34     ` Chunyan Zhang

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