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_ALTERA_JTAGUART
  58         bool "Altera JTAG UART"
  59         help
  60           Select this to enable a debug UART using the altera_jtag_uart driver.
  61           You 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_UART_ALTERA_UART
  65         bool "Altera UART"
  66         help
  67           Select this to enable a debug UART using the altera_uart driver.
  68           You will need to provide parameters to make this work. The driver will
  69           be available until the real driver model serial is running.
  70
  71 config DEBUG_UART_NS16550
  72         bool "ns16550"
  73         help
  74           Select this to enable a debug UART using the ns16550 driver. You
  75           will need to provide parameters to make this work. The driver will
  76           be available until the real driver model serial is running.
  77
  78 config DEBUG_EFI_CONSOLE
  79         bool "EFI"
  80         depends on EFI_APP
  81         help
  82           Select this to enable a debug console which calls back to EFI to
  83           output to the console. This can be useful for early debugging of
  84           U-Boot when running on top of EFI (Extensive Firmware Interface).
  85           This is a type of BIOS used by PCs.
  86
  87 config DEBUG_UART_S5P
  88         bool "Samsung S5P"
  89         help
  90           Select this to enable a debug UART using the serial_s5p driver. You
  91           will need to provide parameters to make this work. The driver will
  92           be available until the real driver-model serial is running.
  93
  94 config DEBUG_UART_ZYNQ
  95         bool "Xilinx Zynq"
  96         help
  97           Select this to enable a debug UART using the serial_s5p driver. You
  98           will need to provide parameters to make this work. The driver will
  99           be available until the real driver-model serial is running.
 100
 101 config DEBUG_UART_APBUART
 102         depends on LEON3
 103         bool "Gaisler APBUART"
 104         help
 105           Select this to enable a debug UART using the serial_leon3 driver. You
 106           will need to provide parameters to make this work. The driver will
 107           be available until the real driver model serial is running.
 108
 109 endchoice
 110
 111 config DEBUG_UART_BASE
 112         hex "Base address of UART"
 113         depends on DEBUG_UART
 114         help
 115           This is the base address of your UART for memory-mapped UARTs.
 116
 117           A default should be provided by your board, but if not you will need
 118           to use the correct value here.
 119
 120 config DEBUG_UART_CLOCK
 121         int "UART input clock"
 122         depends on DEBUG_UART
 123         help
 124           The UART input clock determines the speed of the internal UART
 125           circuitry. The baud rate is derived from this by dividing the input
 126           clock down.
 127
 128           A default should be provided by your board, but if not you will need
 129           to use the correct value here.
 130
 131 config DEBUG_UART_SHIFT
 132         int "UART register shift"
 133         depends on DEBUG_UART
 134         default 0 if DEBUG_UART
 135         help
 136           Some UARTs (notably ns16550) support different register layouts
 137           where the registers are spaced either as bytes, words or some other
 138           value. Use this value to specify the shift to use, where 0=byte
 139           registers, 2=32-bit word registers, etc.
 140
 141 config DEBUG_UART_BOARD_INIT
 142         bool "Enable board-specific debug UART init"
 143         depends on DEBUG_UART
 144         help
 145           Some boards need to set things up before the debug UART can be used.
 146           On these boards a call to debug_uart_init() is insufficient. When
 147           this option is enabled, the function board_debug_uart_init() will
 148           be called when debug_uart_init() is called. You can put any code
 149           here that is needed to set up the UART ready for use, such as set
 150           pin multiplexing or enable clocks.
 151
 152 config DEBUG_UART_ANNOUNCE
 153         bool "Show a message when the debug UART starts up"
 154         depends on DEBUG_UART
 155         help
 156           Enable this option to show a message when the debug UART is ready
 157           for use. You will see a message like "<debug_uart> " as soon as
 158           U-Boot has the UART ready for use (i.e. your code calls
 159           debug_uart_init()). This can be useful just as a check that
 160           everything is working.
 161
 162 config ALTERA_JTAG_UART
 163         bool "Altera JTAG UART support"
 164         depends on DM_SERIAL
 165         help
 166           Select this to enable an JTAG UART for Altera devices.The JTAG UART
 167           core implements a method to communicate serial character streams
 168           between a host PC and a Qsys system on an Altera FPGA. Please find
 169           details on the "Embedded Peripherals IP User Guide" of Altera.
 170
 171 config ALTERA_JTAG_UART_BYPASS
 172         bool "Bypass output when no connection"
 173         depends on ALTERA_JTAG_UART
 174         help
 175           Bypass console output and keep going even if there is no JTAG
 176           terminal connection with the host. The console output will resume
 177           once the JTAG terminal is connected. Without the bypass, the console
 178           output will wait forever until a JTAG terminal is connected. If you
 179           not are sure, say Y.
 180
 181 config ALTERA_UART
 182         bool "Altera UART support"
 183         depends on DM_SERIAL
 184         help
 185           Select this to enable an UART for Altera devices. Please find
 186           details on the "Embedded Peripherals IP User Guide" of Altera.
 187
 188 config ROCKCHIP_SERIAL
 189         bool "Rockchip on-chip UART support"
 190         depends on ARCH_ROCKCHIP && DM_SERIAL
 191         help
 192           Select this to enable a debug UART for Rockchip devices. This uses
 193           the ns16550 driver. You will need to #define CONFIG_SYS_NS16550 in
 194           your board config header. The clock input is automatically set to
 195           use the oscillator (24MHz).
 196
 197 config SANDBOX_SERIAL
 198         bool "Sandbox UART support"
 199         depends on SANDBOX
 200         help
 201           Select this to enable a seral UART for sandbox. This is required to
 202           operate correctly, otherwise you will see no serial output from
 203           sandbox. The emulated UART will display to the console and console
 204           input will be fed into the UART. This allows you to interact with
 205           U-Boot.
 206
 207           The operation of the console is controlled by the -t command-line
 208           flag. In raw mode, U-Boot sees all characters from the terminal
 209           before they are processed, including Ctrl-C. In cooked mode, Ctrl-C
 210           is processed by the terminal, and terminates U-Boot. Valid options
 211           are:
 212
 213              -t raw-with-sigs   Raw mode, Ctrl-C will terminate U-Boot
 214              -t raw             Raw mode, Ctrl-C is processed by U-Boot
 215              -t cooked          Cooked mode, Ctrl-C terminates
 216
 217 config UNIPHIER_SERIAL
 218         bool "Support for UniPhier on-chip UART"
 219         depends on ARCH_UNIPHIER
 220         help
 221           If you have a UniPhier based board and want to use the on-chip
 222           serial ports, say Y to this option. If unsure, say N.
 223
 224 config X86_SERIAL
 225         bool "Support for 16550 serial port on x86 machines"
 226         depends on X86
 227         default y
 228         help
 229           Most x86 machines have a ns16550 UART or compatible. This can be
 230           enabled in the device tree with the correct input clock frequency
 231           provided (default 1843200). Enable this to obtain serial console
 232           output.
 233
 234 endmenu