[PATCH 19/22] ARM: sunxi: Add earlyprintk support using R_UART (sun6i/sun8i)
maxime.ripard at free-electrons.com
Tue May 27 01:34:50 PDT 2014
On Mon, May 26, 2014 at 05:25:43PM +0800, Chen-Yu Tsai wrote:
> 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.
Then a depends on MACH_SUN6I || MACH_SUN8I.
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
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