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_NS16550 65 bool "ns16550" 66 help 67 Select this to enable a debug UART using the ns16550 driver. You 68 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_EFI_CONSOLE 72 bool "EFI" 73 depends on EFI_APP 74 help 75 Select this to enable a debug console which calls back to EFI to 76 output to the console. This can be useful for early debugging of 77 U-Boot when running on top of EFI (Extensive Firmware Interface). 78 This is a type of BIOS used by PCs. 79 80config DEBUG_UART_S5P 81 bool "Samsung S5P" 82 help 83 Select this to enable a debug UART using the serial_s5p driver. You 84 will need to provide parameters to make this work. The driver will 85 be available until the real driver-model serial is running. 86 87endchoice 88 89config DEBUG_UART_BASE 90 hex "Base address of UART" 91 depends on DEBUG_UART 92 help 93 This is the base address of your UART for memory-mapped UARTs. 94 95 A default should be provided by your board, but if not you will need 96 to use the correct value here. 97 98config DEBUG_UART_CLOCK 99 int "UART input clock" 100 depends on DEBUG_UART 101 help 102 The UART input clock determines the speed of the internal UART 103 circuitry. The baud rate is derived from this by dividing the input 104 clock down. 105 106 A default should be provided by your board, but if not you will need 107 to use the correct value here. 108 109config DEBUG_UART_SHIFT 110 int "UART register shift" 111 depends on DEBUG_UART 112 default 0 if DEBUG_UART 113 help 114 Some UARTs (notably ns16550) support different register layouts 115 where the registers are spaced either as bytes, words or some other 116 value. Use this value to specify the shift to use, where 0=byte 117 registers, 2=32-bit word registers, etc. 118 119config DEBUG_UART_BOARD_INIT 120 bool "Enable board-specific debug UART init" 121 depends on DEBUG_UART 122 help 123 Some boards need to set things up before the debug UART can be used. 124 On these boards a call to debug_uart_init() is insufficient. When 125 this option is enabled, the function board_debug_uart_init() will 126 be called when debug_uart_init() is called. You can put any code 127 here that is needed to set up the UART ready for use, such as set 128 pin multiplexing or enable clocks. 129 130config DEBUG_UART_ANNOUNCE 131 bool "Show a message when the debug UART starts up" 132 depends on DEBUG_UART 133 help 134 Enable this option to show a message when the debug UART is ready 135 for use. You will see a message like "<debug_uart> " as soon as 136 U-Boot has the UART ready for use (i.e. your code calls 137 debug_uart_init()). This can be useful just as a check that 138 everything is working. 139 140config ALTERA_JTAG_UART 141 bool "Altera JTAG UART support" 142 depends on DM_SERIAL 143 help 144 Select this to enable an JTAG UART for Altera devices.The JTAG UART 145 core implements a method to communicate serial character streams 146 between a host PC and a Qsys system on an Altera FPGA. Please find 147 details on the "Embedded Peripherals IP User Guide" of Altera. 148 149config ALTERA_JTAG_UART_BYPASS 150 bool "Bypass output when no connection" 151 depends on ALTERA_JTAG_UART 152 help 153 Bypass console output and keep going even if there is no JTAG 154 terminal connection with the host. The console output will resume 155 once the JTAG terminal is connected. Without the bypass, the console 156 output will wait forever until a JTAG terminal is connected. If you 157 not are sure, say Y. 158 159config ROCKCHIP_SERIAL 160 bool "Rockchip on-chip UART support" 161 depends on ARCH_ROCKCHIP && DM_SERIAL 162 help 163 Select this to enable a debug UART for Rockchip devices. This uses 164 the ns16550 driver. You will need to #define CONFIG_SYS_NS16550 in 165 your board config header. The clock input is automatically set to 166 use the oscillator (24MHz). 167 168config SANDBOX_SERIAL 169 bool "Sandbox UART support" 170 depends on SANDBOX 171 help 172 Select this to enable a seral UART for sandbox. This is required to 173 operate correctly, otherwise you will see no serial output from 174 sandbox. The emulated UART will display to the console and console 175 input will be fed into the UART. This allows you to interact with 176 U-Boot. 177 178 The operation of the console is controlled by the -t command-line 179 flag. In raw mode, U-Boot sees all characters from the terminal 180 before they are processed, including Ctrl-C. In cooked mode, Ctrl-C 181 is processed by the terminal, and terminates U-Boot. Valid options 182 are: 183 184 -t raw-with-sigs Raw mode, Ctrl-C will terminate U-Boot 185 -t raw Raw mode, Ctrl-C is processed by U-Boot 186 -t cooked Cooked mode, Ctrl-C terminates 187 188config UNIPHIER_SERIAL 189 bool "Support for UniPhier on-chip UART" 190 depends on ARCH_UNIPHIER 191 help 192 If you have a UniPhier based board and want to use the on-chip 193 serial ports, say Y to this option. If unsure, say N. 194 195config X86_SERIAL 196 bool "Support for 16550 serial port on x86 machines" 197 depends on X86 198 default y 199 help 200 Most x86 machines have a ns16550 UART or compatible. This can be 201 enabled in the device tree with the correct input clock frequency 202 provided (default 1843200). Enable this to obtain serial console 203 output. 204 205endmenu 206