X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=drivers%2Fserial%2FKconfig;h=5611fac0dc46793bfc23f08573eddb89a7ce2a91;hb=656ae05273419c344c11466de72476455793d6b6;hp=c94353ba6acf44ac0f1c5360f11a8da86ce7f649;hpb=757566d1567a98f5c331c14f088001dbfe187191;p=oweals%2Fu-boot.git

diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index c94353ba6a..5611fac0dc 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -7,8 +7,78 @@ config DM_SERIAL
 	  implements serial_putc() etc. The uclass interface is
 	  defined in include/serial.h.
 
+config DEBUG_UART
+	bool "Enable an early debug UART for debugging"
+	help
+	  The debug UART is intended for use very early in U-Boot to debug
+	  problems when an ICE or other debug mechanism is not available.
+
+	  To use it you should:
+	  - Make sure your UART supports this interface
+	  - Enable CONFIG_DEBUG_UART
+	  - Enable the CONFIG for your UART to tell it to provide this interface
+	        (e.g. CONFIG_DEBUG_UART_NS16550)
+	  - Define the required settings as needed (see below)
+	  - Call debug_uart_init() before use
+	  - Call debug_uart_putc() to output a character
+
+	  Depending on your platform it may be possible to use this UART before
+	  a stack is available.
+
+	  If your UART does not support this interface you can probably add
+	  support quite easily. Remember that you cannot use driver model and
+	  it is preferred to use no stack.
+
+	  You must not use this UART once driver model is working and the
+	  serial drivers are up and running (done in serial_init()). Otherwise
+	  the drivers may conflict and you will get strange output.
+
+choice
+	prompt "Select which UART will provide the debug UART"
+	depends on DEBUG_UART
+
+config DEBUG_UART_NS16550
+	bool "ns16550"
+	help
+	  Select this to enable a debug UART using the ns16550 driver. You
+	  will need to provide parameters to make this work. The driver will
+	  be available until the real driver model serial is running.
+
+endchoice
+
+config DEBUG_UART_BASE
+	hex "Base address of UART"
+	depends on DEBUG_UART
+	help
+	  This is the base address of your UART for memory-mapped UARTs.
+
+	  A default should be provided by your board, but if not you will need
+	  to use the correct value here.
+
+config DEBUG_UART_CLOCK
+	int "UART input clock"
+	depends on DEBUG_UART
+	help
+	  The UART input clock determines the speed of the internal UART
+	  circuitry. The baud rate is derived from this by dividing the input
+	  clock down.
+
+	  A default should be provided by your board, but if not you will need
+	  to use the correct value here.
+
+config DEBUG_UART_SHIFT
+	int "UART register shift"
+	depends on DEBUG_UART
+	default 0 if DEBUG_UART
+	help
+	  Some UARTs (notably ns16550) support different register layouts
+	  where the registers are spaced either as bytes, words or some other
+	  value. Use this value to specify the shift to use, where 0=byte
+	  registers, 2=32-bit word registers, etc.
+
 config UNIPHIER_SERIAL
-	bool "UniPhier on-chip UART support"
+	bool "Support for UniPhier on-chip UART"
 	depends on ARCH_UNIPHIER && DM_SERIAL
 	help
-	  Support for the on-chip UARTs on the Panasonic UniPhier platform.
+	  If you have a UniPhier based board and want to use the on-chip
+	  serial ports, say Y to this option. If unsure, say N.