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 SERIAL_PRESENT
  19         bool "Provide a serial driver"
  20         depends on DM_SERIAL
  21         default y
  22         help
  23           In very space-constrained devices even the full UART driver is too
  24           large. In this case the debug UART can still be used in some cases.
  25           This option enables the full UART in U-Boot, so if is it disabled,
  26           the full UART driver will be omitted, thus saving space.
  27
  28 config SPL_SERIAL_PRESENT
  29         bool "Provide a serial driver in SPL"
  30         depends on DM_SERIAL
  31         default y
  32         help
  33           In very space-constrained devices even the full UART driver is too
  34           large. In this case the debug UART can still be used in some cases.
  35           This option enables the full UART in SPL, so if is it disabled,
  36           the full UART driver will be omitted, thus saving space.
  37
  38 config DM_SERIAL
  39         bool "Enable Driver Model for serial drivers"
  40         depends on DM
  41         help
  42           Enable driver model for serial. This replaces
  43           drivers/serial/serial.c with the serial uclass, which
  44           implements serial_putc() etc. The uclass interface is
  45           defined in include/serial.h.
  46
  47 config DEBUG_UART
  48         bool "Enable an early debug UART for debugging"
  49         help
  50           The debug UART is intended for use very early in U-Boot to debug
  51           problems when an ICE or other debug mechanism is not available.
  52
  53           To use it you should:
  54           - Make sure your UART supports this interface
  55           - Enable CONFIG_DEBUG_UART
  56           - Enable the CONFIG for your UART to tell it to provide this interface
  57                 (e.g. CONFIG_DEBUG_UART_NS16550)
  58           - Define the required settings as needed (see below)
  59           - Call debug_uart_init() before use
  60           - Call debug_uart_putc() to output a character
  61
  62           Depending on your platform it may be possible to use this UART before
  63           a stack is available.
  64
  65           If your UART does not support this interface you can probably add
  66           support quite easily. Remember that you cannot use driver model and
  67           it is preferred to use no stack.
  68
  69           You must not use this UART once driver model is working and the
  70           serial drivers are up and running (done in serial_init()). Otherwise
  71           the drivers may conflict and you will get strange output.
  72
  73 choice
  74         prompt "Select which UART will provide the debug UART"
  75         depends on DEBUG_UART
  76         default DEBUG_UART_NS16550
  77
  78 config DEBUG_UART_ALTERA_JTAGUART
  79         bool "Altera JTAG UART"
  80         help
  81           Select this to enable a debug UART using the altera_jtag_uart driver.
  82           You will need to provide parameters to make this work. The driver will
  83           be available until the real driver model serial is running.
  84
  85 config DEBUG_UART_ALTERA_UART
  86         bool "Altera UART"
  87         help
  88           Select this to enable a debug UART using the altera_uart driver.
  89           You will need to provide parameters to make this work. The driver will
  90           be available until the real driver model serial is running.
  91
  92 config DEBUG_UART_NS16550
  93         bool "ns16550"
  94         help
  95           Select this to enable a debug UART using the ns16550 driver. You
  96           will need to provide parameters to make this work. The driver will
  97           be available until the real driver model serial is running.
  98
  99 config DEBUG_EFI_CONSOLE
 100         bool "EFI"
 101         depends on EFI_APP
 102         help
 103           Select this to enable a debug console which calls back to EFI to
 104           output to the console. This can be useful for early debugging of
 105           U-Boot when running on top of EFI (Extensive Firmware Interface).
 106           This is a type of BIOS used by PCs.
 107
 108 config DEBUG_UART_S5P
 109         bool "Samsung S5P"
 110         help
 111           Select this to enable a debug UART using the serial_s5p driver. You
 112           will need to provide parameters to make this work. The driver will
 113           be available until the real driver-model serial is running.
 114
 115 config DEBUG_UART_UARTLITE
 116         bool "Xilinx Uartlite"
 117         help
 118           Select this to enable a debug UART using the serial_uartlite driver.
 119           You will need to provide parameters to make this work. The driver will
 120           be available until the real driver-model serial is running.
 121
 122 config DEBUG_UART_ZYNQ
 123         bool "Xilinx Zynq"
 124         help
 125           Select this to enable a debug UART using the serial_zynq driver. You
 126           will need to provide parameters to make this work. The driver will
 127           be available until the real driver-model serial is running.
 128
 129 config DEBUG_UART_APBUART
 130         depends on LEON3
 131         bool "Gaisler APBUART"
 132         help
 133           Select this to enable a debug UART using the serial_leon3 driver. You
 134           will need to provide parameters to make this work. The driver will
 135           be available until the real driver model serial is running.
 136
 137 config DEBUG_UART_PL010
 138         bool "pl010"
 139         help
 140           Select this to enable a debug UART using the pl01x driver with the
 141           PL010 UART type. You will need to provide parameters to make this
 142           work. The driver will be available until the real driver model
 143           serial is running.
 144
 145 config DEBUG_UART_PL011
 146         bool "pl011"
 147         help
 148           Select this to enable a debug UART using the pl01x driver with the
 149           PL011 UART type. You will need to provide parameters to make this
 150           work. The driver will be available until the real driver model
 151           serial is running.
 152
 153 endchoice
 154
 155 config DEBUG_UART_BASE
 156         hex "Base address of UART"
 157         depends on DEBUG_UART
 158         help
 159           This is the base address of your UART for memory-mapped UARTs.
 160
 161           A default should be provided by your board, but if not you will need
 162           to use the correct value here.
 163
 164 config DEBUG_UART_CLOCK
 165         int "UART input clock"
 166         depends on DEBUG_UART
 167         help
 168           The UART input clock determines the speed of the internal UART
 169           circuitry. The baud rate is derived from this by dividing the input
 170           clock down.
 171
 172           A default should be provided by your board, but if not you will need
 173           to use the correct value here.
 174
 175 config DEBUG_UART_SHIFT
 176         int "UART register shift"
 177         depends on DEBUG_UART
 178         default 0 if DEBUG_UART
 179         help
 180           Some UARTs (notably ns16550) support different register layouts
 181           where the registers are spaced either as bytes, words or some other
 182           value. Use this value to specify the shift to use, where 0=byte
 183           registers, 2=32-bit word registers, etc.
 184
 185 config DEBUG_UART_BOARD_INIT
 186         bool "Enable board-specific debug UART init"
 187         depends on DEBUG_UART
 188         help
 189           Some boards need to set things up before the debug UART can be used.
 190           On these boards a call to debug_uart_init() is insufficient. When
 191           this option is enabled, the function board_debug_uart_init() will
 192           be called when debug_uart_init() is called. You can put any code
 193           here that is needed to set up the UART ready for use, such as set
 194           pin multiplexing or enable clocks.
 195
 196 config DEBUG_UART_ANNOUNCE
 197         bool "Show a message when the debug UART starts up"
 198         depends on DEBUG_UART
 199         help
 200           Enable this option to show a message when the debug UART is ready
 201           for use. You will see a message like "<debug_uart> " as soon as
 202           U-Boot has the UART ready for use (i.e. your code calls
 203           debug_uart_init()). This can be useful just as a check that
 204           everything is working.
 205
 206 config DEBUG_UART_SKIP_INIT
 207         bool "Skip UART initialization"
 208         help
 209           Select this if the UART you want to use for debug output is already
 210           initialized by the time U-Boot starts its execution.
 211
 212 config ALTERA_JTAG_UART
 213         bool "Altera JTAG UART support"
 214         depends on DM_SERIAL
 215         help
 216           Select this to enable an JTAG UART for Altera devices.The JTAG UART
 217           core implements a method to communicate serial character streams
 218           between a host PC and a Qsys system on an Altera FPGA. Please find
 219           details on the "Embedded Peripherals IP User Guide" of Altera.
 220
 221 config ALTERA_JTAG_UART_BYPASS
 222         bool "Bypass output when no connection"
 223         depends on ALTERA_JTAG_UART
 224         help
 225           Bypass console output and keep going even if there is no JTAG
 226           terminal connection with the host. The console output will resume
 227           once the JTAG terminal is connected. Without the bypass, the console
 228           output will wait forever until a JTAG terminal is connected. If you
 229           not are sure, say Y.
 230
 231 config ALTERA_UART
 232         bool "Altera UART support"
 233         depends on DM_SERIAL
 234         help
 235           Select this to enable an UART for Altera devices. Please find
 236           details on the "Embedded Peripherals IP User Guide" of Altera.
 237
 238 config FSL_LPUART
 239         bool "Freescale LPUART support"
 240         help
 241           Select this to enable a Low Power UART for Freescale VF610 and
 242           QorIQ Layerscape devices.
 243
 244 config SYS_NS16550
 245         bool "NS16550 UART or compatible"
 246         help
 247           Support NS16550 UART or compatible. This can be enabled in the
 248           device tree with the correct input clock frequency. If the input
 249           clock frequency is not defined in the device tree, the macro
 250           CONFIG_SYS_NS16550_CLK defined in a legacy board header file will
 251           be used. It can be a constant or a function to get clock, eg,
 252           get_serial_clock().
 253
 254 config SANDBOX_SERIAL
 255         bool "Sandbox UART support"
 256         depends on SANDBOX
 257         help
 258           Select this to enable a seral UART for sandbox. This is required to
 259           operate correctly, otherwise you will see no serial output from
 260           sandbox. The emulated UART will display to the console and console
 261           input will be fed into the UART. This allows you to interact with
 262           U-Boot.
 263
 264           The operation of the console is controlled by the -t command-line
 265           flag. In raw mode, U-Boot sees all characters from the terminal
 266           before they are processed, including Ctrl-C. In cooked mode, Ctrl-C
 267           is processed by the terminal, and terminates U-Boot. Valid options
 268           are:
 269
 270              -t raw-with-sigs   Raw mode, Ctrl-C will terminate U-Boot
 271              -t raw             Raw mode, Ctrl-C is processed by U-Boot
 272              -t cooked          Cooked mode, Ctrl-C terminates
 273
 274 config UNIPHIER_SERIAL
 275         bool "Support for UniPhier on-chip UART"
 276         depends on ARCH_UNIPHIER
 277         help
 278           If you have a UniPhier based board and want to use the on-chip
 279           serial ports, say Y to this option. If unsure, say N.
 280
 281 config XILINX_UARTLITE
 282         bool "Xilinx Uarlite support"
 283         depends on DM_SERIAL && (MICROBLAZE || ARCH_ZYNQ || ARCH_ZYNQMP || 4xx)
 284         help
 285           If you have a Xilinx based board and want to use the uartlite
 286           serial ports, say Y to this option. If unsure, say N.
 287
 288 endmenu