drivers/serial/Kconfig

   1 #
   2 # Serial device configuration
   3 #
   4
   5 menu "Serial drivers"
   6
   7 config REQUIRE_SERIAL_CONSOLE
   8         bool "Require a serial port for console"
   9         # Running without a serial console is not supported by the
  10         # non-dm serial code
  11         depends on DM_SERIAL
  12         default y
  13         help
  14           Require a serial port for the console, and panic if none is found
  15           during serial port initialization (default y). Set this to n on
  16           boards which have no debug serial port whatsoever.
  17
  18 config DM_SERIAL
  19         bool "Enable Driver Model for serial drivers"
  20         depends on DM
  21         help
  22           Enable driver model for serial. This replaces
  23           drivers/serial/serial.c with the serial uclass, which
  24           implements serial_putc() etc. The uclass interface is
  25           defined in include/serial.h.
  26
  27 config DEBUG_UART
  28         bool "Enable an early debug UART for debugging"
  29         help
  30           The debug UART is intended for use very early in U-Boot to debug
  31           problems when an ICE or other debug mechanism is not available.
  32
  33           To use it you should:
  34           - Make sure your UART supports this interface
  35           - Enable CONFIG_DEBUG_UART
  36           - Enable the CONFIG for your UART to tell it to provide this interface
  37                 (e.g. CONFIG_DEBUG_UART_NS16550)
  38           - Define the required settings as needed (see below)
  39           - Call debug_uart_init() before use
  40           - Call debug_uart_putc() to output a character
  41
  42           Depending on your platform it may be possible to use this UART before
  43           a stack is available.
  44
  45           If your UART does not support this interface you can probably add
  46           support quite easily. Remember that you cannot use driver model and
  47           it is preferred to use no stack.
  48
  49           You must not use this UART once driver model is working and the
  50           serial drivers are up and running (done in serial_init()). Otherwise
  51           the drivers may conflict and you will get strange output.
  52
  53 choice
  54         prompt "Select which UART will provide the debug UART"
  55         depends on DEBUG_UART
  56
  57 config DEBUG_UART_NS16550
  58         bool "ns16550"
  59         help
  60           Select this to enable a debug UART using the ns16550 driver. You
  61           will need to provide parameters to make this work. The driver will
  62           be available until the real driver model serial is running.
  63
  64 config DEBUG_EFI_CONSOLE
  65         bool "EFI"
  66         depends on EFI_APP
  67         help
  68           Select this to enable a debug console which calls back to EFI to
  69           output to the console. This can be useful for early debugging of
  70           U-Boot when running on top of EFI (Extensive Firmware Interface).
  71           This is a type of BIOS used by PCs.
  72
  73 config DEBUG_UART_S5P
  74         bool "Samsung S5P"
  75         help
  76           Select this to enable a debug UART using the serial_s5p driver. You
  77           will need to provide parameters to make this work. The driver will
  78           be available until the real driver-model serial is running.
  79
  80 endchoice
  81
  82 config DEBUG_UART_BASE
  83         hex "Base address of UART"
  84         depends on DEBUG_UART
  85         help
  86           This is the base address of your UART for memory-mapped UARTs.
  87
  88           A default should be provided by your board, but if not you will need
  89           to use the correct value here.
  90
  91 config DEBUG_UART_CLOCK
  92         int "UART input clock"
  93         depends on DEBUG_UART
  94         help
  95           The UART input clock determines the speed of the internal UART
  96           circuitry. The baud rate is derived from this by dividing the input
  97           clock down.
  98
  99           A default should be provided by your board, but if not you will need
 100           to use the correct value here.
 101
 102 config DEBUG_UART_SHIFT
 103         int "UART register shift"
 104         depends on DEBUG_UART
 105         default 0 if DEBUG_UART
 106         help
 107           Some UARTs (notably ns16550) support different register layouts
 108           where the registers are spaced either as bytes, words or some other
 109           value. Use this value to specify the shift to use, where 0=byte
 110           registers, 2=32-bit word registers, etc.
 111
 112 config DEBUG_UART_BOARD_INIT
 113         bool "Enable board-specific debug UART init"
 114         depends on DEBUG_UART
 115         help
 116           Some boards need to set things up before the debug UART can be used.
 117           On these boards a call to debug_uart_init() is insufficient. When
 118           this option is enabled, the function board_debug_uart_init() will
 119           be called when debug_uart_init() is called. You can put any code
 120           here that is needed to set up the UART ready for use, such as set
 121           pin multiplexing or enable clocks.
 122
 123 config DEBUG_UART_ANNOUNCE
 124         bool "Show a message when the debug UART starts up"
 125         depends on DEBUG_UART
 126         help
 127           Enable this option to show a message when the debug UART is ready
 128           for use. You will see a message like "<debug_uart> " as soon as
 129           U-Boot has the UART ready for use (i.e. your code calls
 130           debug_uart_init()). This can be useful just as a check that
 131           everything is working.
 132
 133 config ROCKCHIP_SERIAL
 134         bool "Rockchip on-chip UART support"
 135         depends on ARCH_ROCKCHIP && DM_SERIAL
 136         help
 137           Select this to enable a debug UART for Rockchip devices. This uses
 138           the ns16550 driver. You will need to #define CONFIG_SYS_NS16550 in
 139           your board config header. The clock input is automatically set to
 140           use the oscillator (24MHz).
 141
 142 config SANDBOX_SERIAL
 143         bool "Sandbox UART support"
 144         depends on SANDBOX
 145         help
 146           Select this to enable a seral UART for sandbox. This is required to
 147           operate correctly, otherwise you will see no serial output from
 148           sandbox. The emulated UART will display to the console and console
 149           input will be fed into the UART. This allows you to interact with
 150           U-Boot.
 151
 152           The operation of the console is controlled by the -t command-line
 153           flag. In raw mode, U-Boot sees all characters from the terminal
 154           before they are processed, including Ctrl-C. In cooked mode, Ctrl-C
 155           is processed by the terminal, and terminates U-Boot. Valid options
 156           are:
 157
 158              -t raw-with-sigs   Raw mode, Ctrl-C will terminate U-Boot
 159              -t raw             Raw mode, Ctrl-C is processed by U-Boot
 160              -t cooked          Cooked mode, Ctrl-C terminates
 161
 162 config UNIPHIER_SERIAL
 163         bool "Support for UniPhier on-chip UART"
 164         depends on ARCH_UNIPHIER
 165         help
 166           If you have a UniPhier based board and want to use the on-chip
 167           serial ports, say Y to this option. If unsure, say N.
 168
 169 config X86_SERIAL
 170         bool "Support for 16550 serial port on x86 machines"
 171         depends on X86
 172         default y
 173         help
 174           Most x86 machines have a ns16550 UART or compatible. This can be
 175           enabled in the device tree with the correct input clock frequency
 176           provided (default 1843200). Enable this to obtain serial console
 177           output.
 178
 179 endmenu