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

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Message-ID: <CAGb2v66jL5-rmSy0W38og6bLiNkGu0wekEZfOuh0Fn2oOsJpaQ@mail.gmail.com>
Date:	Mon, 26 May 2014 17:25:43 +0800
From:	Chen-Yu Tsai <wens@...e.org>
To:	Maxime Ripard <maxime.ripard@...e-electrons.com>
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 <linux-arm-kernel@...ts.infradead.org>,
	devicetree <devicetree@...r.kernel.org>,
	linux-kernel <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)

On Mon, May 26, 2014 at 2:46 AM, Maxime Ripard
<maxime.ripard@...e-electrons.com> wrote:
> 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.

I assume no sun6i devices would use it, or have pads available for it?
If so, then MACH_SUN8I makes sense.


ChenYu
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