linux-kernel - Re: [PATCH 19/22] ARM: sunxi: Add earlyprintk support using R

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Message-ID: <20140525184636.GN10768@lukather>
Date:	Sun, 25 May 2014 20:46:37 +0200
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Chen-Yu Tsai <wens@...e.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Mike Turquette <mturquette@...aro.org>,
	Emilio Lopez <emilio@...pez.com.ar>,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-serial@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	Hans de Goede <hdegoede@...hat.com>,
	Boris BREZILLON <boris.brezillon@...e-electrons.com>,
	Luc Verhaegen <libv@...net.be>
Subject: Re: [PATCH 19/22] ARM: sunxi: Add earlyprintk support using R_UART
 (sun6i/sun8i)

Hi,

On Fri, May 23, 2014 at 03:51:22PM +0800, Chen-Yu Tsai wrote:
> sun6i/sun8i have a UART in the RTC block group, which can be used
> as an early console. This is most useful on sun8i as UART0 is muxed
> with MMC0, which is not available if we boot from MMC.
> 
> Signed-off-by: Chen-Yu Tsai <wens@...e.org>
> ---
>  arch/arm/Kconfig.debug | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
> index eab8ecb..9e22708 100644
> --- a/arch/arm/Kconfig.debug
> +++ b/arch/arm/Kconfig.debug
> @@ -694,6 +694,14 @@ choice
>  		  Say Y here if you want kernel low-level debugging support
>  		  on Allwinner A1X based platforms on the UART1.
>  
> +	config DEBUG_SUNXI_R_UART
> +		bool "Kernel low-level debugging messages via sunXi R_UART"
> +		depends on ARCH_SUNXI

It should rather depend on MACH_SUN8I.

Maxime

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

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