1# 2# Serial device configuration 3# 4 5menu "Serial drivers" 6 7config 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 18config 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 28config 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 38config 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 47config 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 73choice 74 prompt "Select which UART will provide the debug UART" 75 depends on DEBUG_UART 76 default DEBUG_UART_NS16550 77 78config 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 85config 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 92config 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 99config 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 108config 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 115config 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 122config 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 129config 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 137config 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 145config 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 153endchoice 154 155config 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 164config 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 175config 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 185config 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 196config 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 206config 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 212config 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 221config 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 231config 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 238config 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 244config 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 254config 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 274config 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 281config 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 288endmenu 289