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Commit c4718543 authored by Chen-Yu Tsai's avatar Chen-Yu Tsai Committed by Maxime Ripard
Browse files

ARM: sunxi: Add earlyprintk support using R_UART (sun6i/sun8i) 



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: default avatarChen-Yu Tsai <wens@csie.org>
Acked-by: default avatarMaxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: default avatarMaxime Ripard <maxime.ripard@free-electrons.com>
parent ac84b79f

arch/arm/Kconfig.debug

+10 −0
Original line number Diff line number Diff line
@@ -715,6 +715,14 @@ 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 MACH_SUN6I || MACH_SUN8I

		select DEBUG_UART_8250

		help

		  Say Y here if you want kernel low-level debugging support

		  on Allwinner A31/A23 based platforms on the R_UART.



	config TEGRA_DEBUG_UART_AUTO_ODMDATA

		bool "Kernel low-level debugging messages via Tegra UART via ODMDATA"

		depends on ARCH_TEGRA
@@ -1043,6 +1051,7 @@ config DEBUG_UART_PHYS 
	default 0x01c28400 if DEBUG_SUNXI_UART1

	default 0x01d0c000 if DEBUG_DAVINCI_DA8XX_UART1

	default 0x01d0d000 if DEBUG_DAVINCI_DA8XX_UART2

	default 0x01f02800 if DEBUG_SUNXI_R_UART

	default 0x02530c00 if DEBUG_KEYSTONE_UART0

	default 0x02531000 if DEBUG_KEYSTONE_UART1

	default 0x03010fe0 if ARCH_RPC
@@ -1118,6 +1127,7 @@ config DEBUG_UART_VIRT 
	default 0xf1600000 if ARCH_INTEGRATOR

	default 0xf1c28000 if DEBUG_SUNXI_UART0

	default 0xf1c28400 if DEBUG_SUNXI_UART1

	default 0xf1f02800 if DEBUG_SUNXI_R_UART

	default 0xf2100000 if DEBUG_PXA_UART1

	default 0xf4090000 if ARCH_LPC32XX

	default 0xf4200000 if ARCH_GEMINI