[PATCH 19/22] ARM: sunxi: Add earlyprintk support using R_UART (sun6i/sun8i)

[Chen-Yu Tsai]

On Mon, May 26, 2014 at 2:46 AM, Maxime Ripard
<maxime.ripard at free-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 at csie.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