From mboxrd@z Thu Jan  1 00:00:00 1970
From: Maxime Ripard <maxime.ripard@free-electrons.com>
Subject: Re: [PATCH 19/22] ARM: sunxi: Add earlyprintk support using R_UART
 (sun6i/sun8i)
Date: Sun, 25 May 2014 20:46:37 +0200
Message-ID: <20140525184636.GN10768@lukather>
References: <1400831485-28576-1-git-send-email-wens@csie.org>
 <1400831485-28576-20-git-send-email-wens@csie.org>
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In-Reply-To: <1400831485-28576-20-git-send-email-wens@csie.org>
Sender: linux-kernel-owner@vger.kernel.org
To: Chen-Yu Tsai <wens@csie.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Samuel Ortiz <sameo@linux.intel.com>, Lee Jones <lee.jones@linaro.org>, Rob Herring <robh+dt@kernel.org>, Mike Turquette <mturquette@linaro.org>, Emilio Lopez <emilio@elopez.com.ar>, Linus Walleij <linus.walleij@linaro.org>, linux-serial@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Hans de Goede <hdegoede@redhat.com>, Boris BREZILLON <boris.brezillon@free-electrons.com>, Luc Verhaegen <libv@skynet.be>
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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.
>=20
> Signed-off-by: Chen-Yu Tsai <wens@csie.org>
> ---
>  arch/arm/Kconfig.debug | 10 ++++++++++
>  1 file changed, 10 insertions(+)
>=20
> 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.
> =20
> +	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

--=20
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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