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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: Chen-Yu Tsai <wens@csie.org>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
This commit is contained in:
Chen-Yu Tsai 2014-06-20 22:52:51 +08:00 committed by Maxime Ripard
parent ac84b79fbd
commit c47185433e
1 changed files with 10 additions and 0 deletions
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10
arch/arm/Kconfig.debug
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@ -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