linux-kernel - Re: [PATCH] ARM: dts: berlin: switch to earlycon

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Date:   Wed, 4 Jul 2018 17:14:35 +0800
From:   Jisheng Zhang <Jisheng.Zhang@...aptics.com>
To:     Thomas Hebb <tommyhebb@...il.com>
Cc:     linux-kernel@...r.kernel.org,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-kernel@...ts.infradead.org (moderated list:ARM/Synaptics
        Berlin SoC support),
        devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND FLATTENED
        DEVICE TREE BINDINGS)
Subject: Re: [PATCH] ARM: dts: berlin: switch to earlycon

Hi Thomas,

On Tue, 29 May 2018 11:41:42 -0400 Thomas Hebb wrote:

> The Synopsys DesignWare 8250 UART in Berlin SoCs is now supported by
> 8250_early, so we can use earlycon for early console output instead
> of earlyprintk, which requires an SoC-specific kernel.

IIRC, earlyprintk still works during the decompress progress while the
earlycon doesn't.

> 
> Signed-off-by: Thomas Hebb <tommyhebb@...il.com>
> ---
>  arch/arm/boot/dts/berlin2-sony-nsz-gs7.dts        | 2 +-
>  arch/arm/boot/dts/berlin2cd-google-chromecast.dts | 2 +-
>  arch/arm/boot/dts/berlin2q-marvell-dmp.dts        | 2 +-
>  3 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/arm/boot/dts/berlin2-sony-nsz-gs7.dts b/arch/arm/boot/dts/berlin2-sony-nsz-gs7.dts
> index 1c475796d17f..f98798bb684f 100644
> --- a/arch/arm/boot/dts/berlin2-sony-nsz-gs7.dts
> +++ b/arch/arm/boot/dts/berlin2-sony-nsz-gs7.dts
> @@ -45,7 +45,7 @@
>  	compatible = "sony,nsz-gs7", "marvell,berlin2", "marvell,berlin";
>  
>  	chosen {
> -		bootargs = "earlyprintk";
> +		bootargs = "earlycon";

Is there something missing here? example, uart8250,mmio,<addr>?

>  		stdout-path = "serial0:115200n8";
>  	};
>  
> diff --git a/arch/arm/boot/dts/berlin2cd-google-chromecast.dts b/arch/arm/boot/dts/berlin2cd-google-chromecast.dts
> index ca24def0ce13..20f31cdeaf38 100644
> --- a/arch/arm/boot/dts/berlin2cd-google-chromecast.dts
> +++ b/arch/arm/boot/dts/berlin2cd-google-chromecast.dts
> @@ -46,7 +46,7 @@
>  	compatible = "google,chromecast", "marvell,berlin2cd", "marvell,berlin";
>  
>  	chosen {
> -		bootargs = "earlyprintk";
> +		bootargs = "earlycon";
>  		stdout-path = "serial0:115200n8";
>  	};
>  
> diff --git a/arch/arm/boot/dts/berlin2q-marvell-dmp.dts b/arch/arm/boot/dts/berlin2q-marvell-dmp.dts
> index 57aa5f8a7c77..9834e84a0797 100644
> --- a/arch/arm/boot/dts/berlin2q-marvell-dmp.dts
> +++ b/arch/arm/boot/dts/berlin2q-marvell-dmp.dts
> @@ -49,7 +49,7 @@
>  	};
>  
>  	chosen {
> -		bootargs = "earlyprintk";
> +		bootargs = "earlycon";
>  		stdout-path = "serial0:115200n8";
>  	};
>