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_ZYNQ
 116         bool "Xilinx Zynq"
 117         help
 118           Select this to enable a debug UART using the serial_zynq driver. You
 119           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_APBUART
 123         depends on LEON3
 124         bool "Gaisler APBUART"
 125         help
 126           Select this to enable a debug UART using the serial_leon3 driver. You
 127           will need to provide parameters to make this work. The driver will
 128           be available until the real driver model serial is running.
 129
 130 config DEBUG_UART_PL010
 131         bool "pl010"
 132         help
 133           Select this to enable a debug UART using the pl01x driver with the
 134           PL010 UART type. You will need to provide parameters to make this
 135           work. The driver will be available until the real driver model
 136           serial is running.
 137
 138 config DEBUG_UART_PL011
 139         bool "pl011"
 140         help
 141           Select this to enable a debug UART using the pl01x driver with the
 142           PL011 UART type. You will need to provide parameters to make this
 143           work. The driver will be available until the real driver model
 144           serial is running.
 145
 146 endchoice
 147
 148 config DEBUG_UART_BASE
 149         hex "Base address of UART"
 150         depends on DEBUG_UART
 151         help
 152           This is the base address of your UART for memory-mapped UARTs.
 153
 154           A default should be provided by your board, but if not you will need
 155           to use the correct value here.
 156
 157 config DEBUG_UART_CLOCK
 158         int "UART input clock"
 159         depends on DEBUG_UART
 160         help
 161           The UART input clock determines the speed of the internal UART
 162           circuitry. The baud rate is derived from this by dividing the input
 163           clock down.
 164
 165           A default should be provided by your board, but if not you will need
 166           to use the correct value here.
 167
 168 config DEBUG_UART_SHIFT
 169         int "UART register shift"
 170         depends on DEBUG_UART
 171         default 0 if DEBUG_UART
 172         help
 173           Some UARTs (notably ns16550) support different register layouts
 174           where the registers are spaced either as bytes, words or some other
 175           value. Use this value to specify the shift to use, where 0=byte
 176           registers, 2=32-bit word registers, etc.
 177
 178 config DEBUG_UART_BOARD_INIT
 179         bool "Enable board-specific debug UART init"
 180         depends on DEBUG_UART
 181         help
 182           Some boards need to set things up before the debug UART can be used.
 183           On these boards a call to debug_uart_init() is insufficient. When
 184           this option is enabled, the function board_debug_uart_init() will
 185           be called when debug_uart_init() is called. You can put any code
 186           here that is needed to set up the UART ready for use, such as set
 187           pin multiplexing or enable clocks.
 188
 189 config DEBUG_UART_ANNOUNCE
 190         bool "Show a message when the debug UART starts up"
 191         depends on DEBUG_UART
 192         help
 193           Enable this option to show a message when the debug UART is ready
 194           for use. You will see a message like "<debug_uart> " as soon as
 195           U-Boot has the UART ready for use (i.e. your code calls
 196           debug_uart_init()). This can be useful just as a check that
 197           everything is working.
 198
 199 config DEBUG_UART_SKIP_INIT
 200         bool "Skip UART initialization"
 201         help
 202           Select this if the UART you want to use for debug output is already
 203           initialized by the time U-Boot starts its execution.
 204
 205 config ALTERA_JTAG_UART
 206         bool "Altera JTAG UART support"
 207         depends on DM_SERIAL
 208         help
 209           Select this to enable an JTAG UART for Altera devices.The JTAG UART
 210           core implements a method to communicate serial character streams
 211           between a host PC and a Qsys system on an Altera FPGA. Please find
 212           details on the "Embedded Peripherals IP User Guide" of Altera.
 213
 214 config ALTERA_JTAG_UART_BYPASS
 215         bool "Bypass output when no connection"
 216         depends on ALTERA_JTAG_UART
 217         help
 218           Bypass console output and keep going even if there is no JTAG
 219           terminal connection with the host. The console output will resume
 220           once the JTAG terminal is connected. Without the bypass, the console
 221           output will wait forever until a JTAG terminal is connected. If you
 222           not are sure, say Y.
 223
 224 config ALTERA_UART
 225         bool "Altera UART support"
 226         depends on DM_SERIAL
 227         help
 228           Select this to enable an UART for Altera devices. Please find
 229           details on the "Embedded Peripherals IP User Guide" of Altera.
 230
 231 config SYS_NS16550
 232         bool "NS16550 UART or compatible"
 233         help
 234           Support NS16550 UART or compatible. This can be enabled in the
 235           device tree with the correct input clock frequency. If the input
 236           clock frequency is not defined in the device tree, the macro
 237           CONFIG_SYS_NS16550_CLK defined in a legacy board header file will
 238           be used. It can be a constant or a function to get clock, eg,
 239           get_serial_clock().
 240
 241 config SANDBOX_SERIAL
 242         bool "Sandbox UART support"
 243         depends on SANDBOX
 244         help
 245           Select this to enable a seral UART for sandbox. This is required to
 246           operate correctly, otherwise you will see no serial output from
 247           sandbox. The emulated UART will display to the console and console
 248           input will be fed into the UART. This allows you to interact with
 249           U-Boot.
 250
 251           The operation of the console is controlled by the -t command-line
 252           flag. In raw mode, U-Boot sees all characters from the terminal
 253           before they are processed, including Ctrl-C. In cooked mode, Ctrl-C
 254           is processed by the terminal, and terminates U-Boot. Valid options
 255           are:
 256
 257              -t raw-with-sigs   Raw mode, Ctrl-C will terminate U-Boot
 258              -t raw             Raw mode, Ctrl-C is processed by U-Boot
 259              -t cooked          Cooked mode, Ctrl-C terminates
 260
 261 config UNIPHIER_SERIAL
 262         bool "Support for UniPhier on-chip UART"
 263         depends on ARCH_UNIPHIER
 264         help
 265           If you have a UniPhier based board and want to use the on-chip
 266           serial ports, say Y to this option. If unsure, say N.
 267
 268 endmenu