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