drivers/serial/Kconfig - platform/external/u-boot - Gitiles

 #
 # Serial device configuration
 #

 menu "Serial drivers"

 config REQUIRE_SERIAL_CONSOLE
 	bool "Require a serial port for console"
 	# Running without a serial console is not supported by the
 	# non-dm serial code
 	depends on DM_SERIAL
 	default y
 	help
 	  Require a serial port for the console, and panic if none is found
 	  during serial port initialization (default y). Set this to n on
 	  boards which have no debug serial port whatsoever.

 config SERIAL_PRESENT
 	bool "Provide a serial driver"
 	depends on DM_SERIAL
 	default y
 	help
 	  In very space-constrained devices even the full UART driver is too
 	  large. In this case the debug UART can still be used in some cases.
 	  This option enables the full UART in U-Boot, so if is it disabled,
 	  the full UART driver will be omitted, thus saving space.

 config SPL_SERIAL_PRESENT
 	bool "Provide a serial driver in SPL"
 	depends on DM_SERIAL
 	default y
 	help
 	  In very space-constrained devices even the full UART driver is too
 	  large. In this case the debug UART can still be used in some cases.
 	  This option enables the full UART in SPL, so if is it disabled,
 	  the full UART driver will be omitted, thus saving space.

 config DM_SERIAL
 	bool "Enable Driver Model for serial drivers"
 	depends on DM
 	help
 	  Enable driver model for serial. This replaces
 	  drivers/serial/serial.c with the serial uclass, which
 	  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
 	default DEBUG_UART_NS16550

 config DEBUG_UART_ALTERA_JTAGUART
 	bool "Altera JTAG UART"
 	help
 	  Select this to enable a debug UART using the altera_jtag_uart driver.
 	  You will need to provide parameters to make this work. The driver will
 	  be available until the real driver model serial is running.

 config DEBUG_UART_ALTERA_UART
 	bool "Altera UART"
 	help
 	  Select this to enable a debug UART using the altera_uart driver.
 	  You will need to provide parameters to make this work. The driver will
 	  be available until the real driver model serial is running.

 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.

 config DEBUG_EFI_CONSOLE
 	bool "EFI"
 	depends on EFI_APP
 	help
 	  Select this to enable a debug console which calls back to EFI to
 	  output to the console. This can be useful for early debugging of
 	  U-Boot when running on top of EFI (Extensive Firmware Interface).
 	  This is a type of BIOS used by PCs.

 config DEBUG_UART_S5P
 	bool "Samsung S5P"
 	help
 	  Select this to enable a debug UART using the serial_s5p driver. You
 	  will need to provide parameters to make this work. The driver will
 	  be available until the real driver-model serial is running.

 config DEBUG_UART_UARTLITE
 	bool "Xilinx Uartlite"
 	help
 	  Select this to enable a debug UART using the serial_uartlite driver.
 	  You will need to provide parameters to make this work. The driver will
 	  be available until the real driver-model serial is running.

 config DEBUG_UART_ARM_DCC
 	bool "ARM DCC"
 	help
 	  Select this to enable a debug UART using the ARM JTAG DCC port.
 	  The DCC port can be used for very early debugging and doesn't require
 	  any additional setting like address/baudrate/clock. On systems without
 	  any serial interface this is the easiest way how to get console.
 	  Every ARM core has own DCC port which is the part of debug interface.
 	  This port is available at least on ARMv6, ARMv7, ARMv8 and XScale
 	  architectures.

 config DEBUG_UART_ZYNQ
 	bool "Xilinx Zynq"
 	help
 	  Select this to enable a debug UART using the serial_zynq driver. You
 	  will need to provide parameters to make this work. The driver will
 	  be available until the real driver-model serial is running.

 config DEBUG_UART_APBUART
 	depends on LEON3
 	bool "Gaisler APBUART"
 	help
 	  Select this to enable a debug UART using the serial_leon3 driver. You
 	  will need to provide parameters to make this work. The driver will
 	  be available until the real driver model serial is running.

 config DEBUG_UART_PL010
 	bool "pl010"
 	help
 	  Select this to enable a debug UART using the pl01x driver with the
 	  PL010 UART type. You will need to provide parameters to make this
 	  work. The driver will be available until the real driver model
 	  serial is running.

 config DEBUG_UART_PL011
 	bool "pl011"
 	help
 	  Select this to enable a debug UART using the pl01x driver with the
 	  PL011 UART type. You will need to provide parameters to make this
 	  work. The driver will be available until the real driver model
 	  serial is running.

 config DEBUG_UART_PIC32
 	bool "Microchip PIC32"
 	depends on PIC32_SERIAL
 	help
 	  Select this to enable a debug UART using the serial_pic32 driver. You
 	  will need to provide parameters to make this work. The driver will
 	  be available until the real driver model serial is running.

 config DEBUG_UART_UNIPHIER
 	bool "UniPhier on-chip UART"
 	depends on ARCH_UNIPHIER
 	help
 	  Select this to enable a debug UART using the UniPhier on-chip UART.
 	  You will need to provide DEBUG_UART_BASE 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 DEBUG_UART_BOARD_INIT
 	bool "Enable board-specific debug UART init"
 	depends on DEBUG_UART
 	help
 	  Some boards need to set things up before the debug UART can be used.
 	  On these boards a call to debug_uart_init() is insufficient. When
 	  this option is enabled, the function board_debug_uart_init() will
 	  be called when debug_uart_init() is called. You can put any code
 	  here that is needed to set up the UART ready for use, such as set
 	  pin multiplexing or enable clocks.

 config DEBUG_UART_ANNOUNCE
 	bool "Show a message when the debug UART starts up"
 	depends on DEBUG_UART
 	help
 	  Enable this option to show a message when the debug UART is ready
 	  for use. You will see a message like "<debug_uart> " as soon as
 	  U-Boot has the UART ready for use (i.e. your code calls
 	  debug_uart_init()). This can be useful just as a check that
 	  everything is working.

 config DEBUG_UART_SKIP_INIT
 	bool "Skip UART initialization"
 	help
 	  Select this if the UART you want to use for debug output is already
 	  initialized by the time U-Boot starts its execution.

 config ALTERA_JTAG_UART
 	bool "Altera JTAG UART support"
 	depends on DM_SERIAL
 	help
 	  Select this to enable an JTAG UART for Altera devices.The JTAG UART
 	  core implements a method to communicate serial character streams
 	  between a host PC and a Qsys system on an Altera FPGA. Please find
 	  details on the "Embedded Peripherals IP User Guide" of Altera.

 config ALTERA_JTAG_UART_BYPASS
 	bool "Bypass output when no connection"
 	depends on ALTERA_JTAG_UART
 	help
 	  Bypass console output and keep going even if there is no JTAG
 	  terminal connection with the host. The console output will resume
 	  once the JTAG terminal is connected. Without the bypass, the console
 	  output will wait forever until a JTAG terminal is connected. If you
 	  not are sure, say Y.

 config ALTERA_UART
 	bool "Altera UART support"
 	depends on DM_SERIAL
 	help
 	  Select this to enable an UART for Altera devices. Please find
 	  details on the "Embedded Peripherals IP User Guide" of Altera.

 config FSL_LPUART
 	bool "Freescale LPUART support"
 	help
 	  Select this to enable a Low Power UART for Freescale VF610 and
 	  QorIQ Layerscape devices.

 config PIC32_SERIAL
 	bool "Support for Microchip PIC32 on-chip UART"
 	depends on DM_SERIAL && MACH_PIC32
 	default y
 	help
 	  Support for the UART found on Microchip PIC32 SoC's.

 config SYS_NS16550
 	bool "NS16550 UART or compatible"
 	help
 	  Support NS16550 UART or compatible. This can be enabled in the
 	  device tree with the correct input clock frequency. If the input
 	  clock frequency is not defined in the device tree, the macro
 	  CONFIG_SYS_NS16550_CLK defined in a legacy board header file will
 	  be used. It can be a constant or a function to get clock, eg,
 	  get_serial_clock().

 config SANDBOX_SERIAL
 	bool "Sandbox UART support"
 	depends on SANDBOX
 	help
 	  Select this to enable a seral UART for sandbox. This is required to
 	  operate correctly, otherwise you will see no serial output from
 	  sandbox. The emulated UART will display to the console and console
 	  input will be fed into the UART. This allows you to interact with
 	  U-Boot.

 	  The operation of the console is controlled by the -t command-line
 	  flag. In raw mode, U-Boot sees all characters from the terminal
 	  before they are processed, including Ctrl-C. In cooked mode, Ctrl-C
 	  is processed by the terminal, and terminates U-Boot. Valid options
 	  are:

 	     -t raw-with-sigs	Raw mode, Ctrl-C will terminate U-Boot
 	     -t raw		Raw mode, Ctrl-C is processed by U-Boot
 	     -t cooked		Cooked mode, Ctrl-C terminates

 config UNIPHIER_SERIAL
 	bool "Support for UniPhier on-chip UART"
 	depends on ARCH_UNIPHIER
 	help
 	  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.

 config XILINX_UARTLITE
 	bool "Xilinx Uarlite support"
 	depends on DM_SERIAL && (MICROBLAZE || ARCH_ZYNQ || ARCH_ZYNQMP || 4xx)
 	help
 	  If you have a Xilinx based board and want to use the uartlite
 	  serial ports, say Y to this option. If unsure, say N.

 config MSM_SERIAL
 	bool "Qualcomm on-chip UART"
 	depends on DM_SERIAL
 	help
 	  Support Data Mover UART used on Qualcomm Snapdragon SoCs.
 	  It should support all Qualcomm devices with UARTDM version 1.4,
 	  for example APQ8016 and MSM8916.
 	  Single baudrate is supported in current implementation (115200).
 endmenu
	#
	# Serial device configuration
	#

	menu "Serial drivers"

	config REQUIRE_SERIAL_CONSOLE
	bool "Require a serial port for console"
	# Running without a serial console is not supported by the
	# non-dm serial code
	depends on DM_SERIAL
	default y
	help
	Require a serial port for the console, and panic if none is found
	during serial port initialization (default y). Set this to n on
	boards which have no debug serial port whatsoever.

	config SERIAL_PRESENT
	bool "Provide a serial driver"
	depends on DM_SERIAL
	default y
	help
	In very space-constrained devices even the full UART driver is too
	large. In this case the debug UART can still be used in some cases.
	This option enables the full UART in U-Boot, so if is it disabled,
	the full UART driver will be omitted, thus saving space.

	config SPL_SERIAL_PRESENT
	bool "Provide a serial driver in SPL"
	depends on DM_SERIAL
	default y
	help
	In very space-constrained devices even the full UART driver is too
	large. In this case the debug UART can still be used in some cases.
	This option enables the full UART in SPL, so if is it disabled,
	the full UART driver will be omitted, thus saving space.

	config DM_SERIAL
	bool "Enable Driver Model for serial drivers"
	depends on DM
	help
	Enable driver model for serial. This replaces
	drivers/serial/serial.c with the serial uclass, which
	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
	default DEBUG_UART_NS16550

	config DEBUG_UART_ALTERA_JTAGUART
	bool "Altera JTAG UART"
	help
	Select this to enable a debug UART using the altera_jtag_uart driver.
	You will need to provide parameters to make this work. The driver will
	be available until the real driver model serial is running.

	config DEBUG_UART_ALTERA_UART
	bool "Altera UART"
	help
	Select this to enable a debug UART using the altera_uart driver.
	You will need to provide parameters to make this work. The driver will
	be available until the real driver model serial is running.

	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.

	config DEBUG_EFI_CONSOLE
	bool "EFI"
	depends on EFI_APP
	help
	Select this to enable a debug console which calls back to EFI to
	output to the console. This can be useful for early debugging of
	U-Boot when running on top of EFI (Extensive Firmware Interface).
	This is a type of BIOS used by PCs.

	config DEBUG_UART_S5P
	bool "Samsung S5P"
	help
	Select this to enable a debug UART using the serial_s5p driver. You
	will need to provide parameters to make this work. The driver will
	be available until the real driver-model serial is running.

	config DEBUG_UART_UARTLITE
	bool "Xilinx Uartlite"
	help
	Select this to enable a debug UART using the serial_uartlite driver.
	You will need to provide parameters to make this work. The driver will
	be available until the real driver-model serial is running.

	config DEBUG_UART_ARM_DCC
	bool "ARM DCC"
	help
	Select this to enable a debug UART using the ARM JTAG DCC port.
	The DCC port can be used for very early debugging and doesn't require
	any additional setting like address/baudrate/clock. On systems without
	any serial interface this is the easiest way how to get console.
	Every ARM core has own DCC port which is the part of debug interface.
	This port is available at least on ARMv6, ARMv7, ARMv8 and XScale
	architectures.

	config DEBUG_UART_ZYNQ
	bool "Xilinx Zynq"
	help
	Select this to enable a debug UART using the serial_zynq driver. You
	will need to provide parameters to make this work. The driver will
	be available until the real driver-model serial is running.

	config DEBUG_UART_APBUART
	depends on LEON3
	bool "Gaisler APBUART"
	help
	Select this to enable a debug UART using the serial_leon3 driver. You
	will need to provide parameters to make this work. The driver will
	be available until the real driver model serial is running.

	config DEBUG_UART_PL010
	bool "pl010"
	help
	Select this to enable a debug UART using the pl01x driver with the
	PL010 UART type. You will need to provide parameters to make this
	work. The driver will be available until the real driver model
	serial is running.

	config DEBUG_UART_PL011
	bool "pl011"
	help
	Select this to enable a debug UART using the pl01x driver with the
	PL011 UART type. You will need to provide parameters to make this
	work. The driver will be available until the real driver model
	serial is running.

	config DEBUG_UART_PIC32
	bool "Microchip PIC32"
	depends on PIC32_SERIAL
	help
	Select this to enable a debug UART using the serial_pic32 driver. You
	will need to provide parameters to make this work. The driver will
	be available until the real driver model serial is running.

	config DEBUG_UART_UNIPHIER
	bool "UniPhier on-chip UART"
	depends on ARCH_UNIPHIER
	help
	Select this to enable a debug UART using the UniPhier on-chip UART.
	You will need to provide DEBUG_UART_BASE 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 DEBUG_UART_BOARD_INIT
	bool "Enable board-specific debug UART init"
	depends on DEBUG_UART
	help
	Some boards need to set things up before the debug UART can be used.
	On these boards a call to debug_uart_init() is insufficient. When
	this option is enabled, the function board_debug_uart_init() will
	be called when debug_uart_init() is called. You can put any code
	here that is needed to set up the UART ready for use, such as set
	pin multiplexing or enable clocks.

	config DEBUG_UART_ANNOUNCE
	bool "Show a message when the debug UART starts up"
	depends on DEBUG_UART
	help
	Enable this option to show a message when the debug UART is ready
	for use. You will see a message like "<debug_uart> " as soon as
	U-Boot has the UART ready for use (i.e. your code calls
	debug_uart_init()). This can be useful just as a check that
	everything is working.

	config DEBUG_UART_SKIP_INIT
	bool "Skip UART initialization"
	help
	Select this if the UART you want to use for debug output is already
	initialized by the time U-Boot starts its execution.

	config ALTERA_JTAG_UART
	bool "Altera JTAG UART support"
	depends on DM_SERIAL
	help
	Select this to enable an JTAG UART for Altera devices.The JTAG UART
	core implements a method to communicate serial character streams
	between a host PC and a Qsys system on an Altera FPGA. Please find
	details on the "Embedded Peripherals IP User Guide" of Altera.

	config ALTERA_JTAG_UART_BYPASS
	bool "Bypass output when no connection"
	depends on ALTERA_JTAG_UART
	help
	Bypass console output and keep going even if there is no JTAG
	terminal connection with the host. The console output will resume
	once the JTAG terminal is connected. Without the bypass, the console
	output will wait forever until a JTAG terminal is connected. If you
	not are sure, say Y.

	config ALTERA_UART
	bool "Altera UART support"
	depends on DM_SERIAL
	help
	Select this to enable an UART for Altera devices. Please find
	details on the "Embedded Peripherals IP User Guide" of Altera.

	config FSL_LPUART
	bool "Freescale LPUART support"
	help
	Select this to enable a Low Power UART for Freescale VF610 and
	QorIQ Layerscape devices.

	config PIC32_SERIAL
	bool "Support for Microchip PIC32 on-chip UART"
	depends on DM_SERIAL && MACH_PIC32
	default y
	help
	Support for the UART found on Microchip PIC32 SoC's.

	config SYS_NS16550
	bool "NS16550 UART or compatible"
	help
	Support NS16550 UART or compatible. This can be enabled in the
	device tree with the correct input clock frequency. If the input
	clock frequency is not defined in the device tree, the macro
	CONFIG_SYS_NS16550_CLK defined in a legacy board header file will
	be used. It can be a constant or a function to get clock, eg,
	get_serial_clock().

	config SANDBOX_SERIAL
	bool "Sandbox UART support"
	depends on SANDBOX
	help
	Select this to enable a seral UART for sandbox. This is required to
	operate correctly, otherwise you will see no serial output from
	sandbox. The emulated UART will display to the console and console
	input will be fed into the UART. This allows you to interact with
	U-Boot.

	The operation of the console is controlled by the -t command-line
	flag. In raw mode, U-Boot sees all characters from the terminal
	before they are processed, including Ctrl-C. In cooked mode, Ctrl-C
	is processed by the terminal, and terminates U-Boot. Valid options
	are:

	-t raw-with-sigs Raw mode, Ctrl-C will terminate U-Boot
	-t raw Raw mode, Ctrl-C is processed by U-Boot
	-t cooked Cooked mode, Ctrl-C terminates

	config UNIPHIER_SERIAL
	bool "Support for UniPhier on-chip UART"
	depends on ARCH_UNIPHIER
	help
	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.

	config XILINX_UARTLITE
	bool "Xilinx Uarlite support"
	depends on DM_SERIAL && (MICROBLAZE \|\| ARCH_ZYNQ \|\| ARCH_ZYNQMP \|\| 4xx)
	help
	If you have a Xilinx based board and want to use the uartlite
	serial ports, say Y to this option. If unsure, say N.

	config MSM_SERIAL
	bool "Qualcomm on-chip UART"
	depends on DM_SERIAL
	help
	Support Data Mover UART used on Qualcomm Snapdragon SoCs.
	It should support all Qualcomm devices with UARTDM version 1.4,
	for example APQ8016 and MSM8916.
	Single baudrate is supported in current implementation (115200).
	endmenu