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 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 27config 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 53choice 54 prompt "Select which UART will provide the debug UART" 55 depends on DEBUG_UART 56 57config 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 64config 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 71config 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 78config 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 87config 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 94config 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 101endchoice 102 103config DEBUG_UART_BASE 104 hex "Base address of UART" 105 depends on DEBUG_UART 106 help 107 This is the base address of your UART for memory-mapped UARTs. 108 109 A default should be provided by your board, but if not you will need 110 to use the correct value here. 111 112config DEBUG_UART_CLOCK 113 int "UART input clock" 114 depends on DEBUG_UART 115 help 116 The UART input clock determines the speed of the internal UART 117 circuitry. The baud rate is derived from this by dividing the input 118 clock down. 119 120 A default should be provided by your board, but if not you will need 121 to use the correct value here. 122 123config DEBUG_UART_SHIFT 124 int "UART register shift" 125 depends on DEBUG_UART 126 default 0 if DEBUG_UART 127 help 128 Some UARTs (notably ns16550) support different register layouts 129 where the registers are spaced either as bytes, words or some other 130 value. Use this value to specify the shift to use, where 0=byte 131 registers, 2=32-bit word registers, etc. 132 133config DEBUG_UART_BOARD_INIT 134 bool "Enable board-specific debug UART init" 135 depends on DEBUG_UART 136 help 137 Some boards need to set things up before the debug UART can be used. 138 On these boards a call to debug_uart_init() is insufficient. When 139 this option is enabled, the function board_debug_uart_init() will 140 be called when debug_uart_init() is called. You can put any code 141 here that is needed to set up the UART ready for use, such as set 142 pin multiplexing or enable clocks. 143 144config DEBUG_UART_ANNOUNCE 145 bool "Show a message when the debug UART starts up" 146 depends on DEBUG_UART 147 help 148 Enable this option to show a message when the debug UART is ready 149 for use. You will see a message like "<debug_uart> " as soon as 150 U-Boot has the UART ready for use (i.e. your code calls 151 debug_uart_init()). This can be useful just as a check that 152 everything is working. 153 154config ALTERA_JTAG_UART 155 bool "Altera JTAG UART support" 156 depends on DM_SERIAL 157 help 158 Select this to enable an JTAG UART for Altera devices.The JTAG UART 159 core implements a method to communicate serial character streams 160 between a host PC and a Qsys system on an Altera FPGA. Please find 161 details on the "Embedded Peripherals IP User Guide" of Altera. 162 163config ALTERA_JTAG_UART_BYPASS 164 bool "Bypass output when no connection" 165 depends on ALTERA_JTAG_UART 166 help 167 Bypass console output and keep going even if there is no JTAG 168 terminal connection with the host. The console output will resume 169 once the JTAG terminal is connected. Without the bypass, the console 170 output will wait forever until a JTAG terminal is connected. If you 171 not are sure, say Y. 172 173config ALTERA_UART 174 bool "Altera UART support" 175 depends on DM_SERIAL 176 help 177 Select this to enable an UART for Altera devices. Please find 178 details on the "Embedded Peripherals IP User Guide" of Altera. 179 180config ROCKCHIP_SERIAL 181 bool "Rockchip on-chip UART support" 182 depends on ARCH_ROCKCHIP && DM_SERIAL 183 help 184 Select this to enable a debug UART for Rockchip devices. This uses 185 the ns16550 driver. You will need to #define CONFIG_SYS_NS16550 in 186 your board config header. The clock input is automatically set to 187 use the oscillator (24MHz). 188 189config SANDBOX_SERIAL 190 bool "Sandbox UART support" 191 depends on SANDBOX 192 help 193 Select this to enable a seral UART for sandbox. This is required to 194 operate correctly, otherwise you will see no serial output from 195 sandbox. The emulated UART will display to the console and console 196 input will be fed into the UART. This allows you to interact with 197 U-Boot. 198 199 The operation of the console is controlled by the -t command-line 200 flag. In raw mode, U-Boot sees all characters from the terminal 201 before they are processed, including Ctrl-C. In cooked mode, Ctrl-C 202 is processed by the terminal, and terminates U-Boot. Valid options 203 are: 204 205 -t raw-with-sigs Raw mode, Ctrl-C will terminate U-Boot 206 -t raw Raw mode, Ctrl-C is processed by U-Boot 207 -t cooked Cooked mode, Ctrl-C terminates 208 209config UNIPHIER_SERIAL 210 bool "Support for UniPhier on-chip UART" 211 depends on ARCH_UNIPHIER 212 help 213 If you have a UniPhier based board and want to use the on-chip 214 serial ports, say Y to this option. If unsure, say N. 215 216config X86_SERIAL 217 bool "Support for 16550 serial port on x86 machines" 218 depends on X86 219 default y 220 help 221 Most x86 machines have a ns16550 UART or compatible. This can be 222 enabled in the device tree with the correct input clock frequency 223 provided (default 1843200). Enable this to obtain serial console 224 output. 225 226endmenu 227