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_NS16550 58 bool "ns16550" 59 help 60 Select this to enable a debug UART using the ns16550 driver. You 61 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_EFI_CONSOLE 65 bool "EFI" 66 depends on EFI_APP 67 help 68 Select this to enable a debug console which calls back to EFI to 69 output to the console. This can be useful for early debugging of 70 U-Boot when running on top of EFI (Extensive Firmware Interface). 71 This is a type of BIOS used by PCs. 72 73config DEBUG_UART_S5P 74 bool "Samsung S5P" 75 help 76 Select this to enable a debug UART using the serial_s5p driver. You 77 will need to provide parameters to make this work. The driver will 78 be available until the real driver-model serial is running. 79 80endchoice 81 82config DEBUG_UART_BASE 83 hex "Base address of UART" 84 depends on DEBUG_UART 85 help 86 This is the base address of your UART for memory-mapped UARTs. 87 88 A default should be provided by your board, but if not you will need 89 to use the correct value here. 90 91config DEBUG_UART_CLOCK 92 int "UART input clock" 93 depends on DEBUG_UART 94 help 95 The UART input clock determines the speed of the internal UART 96 circuitry. The baud rate is derived from this by dividing the input 97 clock down. 98 99 A default should be provided by your board, but if not you will need 100 to use the correct value here. 101 102config DEBUG_UART_SHIFT 103 int "UART register shift" 104 depends on DEBUG_UART 105 default 0 if DEBUG_UART 106 help 107 Some UARTs (notably ns16550) support different register layouts 108 where the registers are spaced either as bytes, words or some other 109 value. Use this value to specify the shift to use, where 0=byte 110 registers, 2=32-bit word registers, etc. 111 112config DEBUG_UART_BOARD_INIT 113 bool "Enable board-specific debug UART init" 114 depends on DEBUG_UART 115 help 116 Some boards need to set things up before the debug UART can be used. 117 On these boards a call to debug_uart_init() is insufficient. When 118 this option is enabled, the function board_debug_uart_init() will 119 be called when debug_uart_init() is called. You can put any code 120 here that is needed to set up the UART ready for use, such as set 121 pin multiplexing or enable clocks. 122 123config DEBUG_UART_ANNOUNCE 124 bool "Show a message when the debug UART starts up" 125 depends on DEBUG_UART 126 help 127 Enable this option to show a message when the debug UART is ready 128 for use. You will see a message like "<debug_uart> " as soon as 129 U-Boot has the UART ready for use (i.e. your code calls 130 debug_uart_init()). This can be useful just as a check that 131 everything is working. 132 133config ROCKCHIP_SERIAL 134 bool "Rockchip on-chip UART support" 135 depends on ARCH_ROCKCHIP && DM_SERIAL 136 help 137 Select this to enable a debug UART for Rockchip devices. This uses 138 the ns16550 driver. You will need to #define CONFIG_SYS_NS16550 in 139 your board config header. The clock input is automatically set to 140 use the oscillator (24MHz). 141 142config SANDBOX_SERIAL 143 bool "Sandbox UART support" 144 depends on SANDBOX 145 help 146 Select this to enable a seral UART for sandbox. This is required to 147 operate correctly, otherwise you will see no serial output from 148 sandbox. The emulated UART will display to the console and console 149 input will be fed into the UART. This allows you to interact with 150 U-Boot. 151 152 The operation of the console is controlled by the -t command-line 153 flag. In raw mode, U-Boot sees all characters from the terminal 154 before they are processed, including Ctrl-C. In cooked mode, Ctrl-C 155 is processed by the terminal, and terminates U-Boot. Valid options 156 are: 157 158 -t raw-with-sigs Raw mode, Ctrl-C will terminate U-Boot 159 -t raw Raw mode, Ctrl-C is processed by U-Boot 160 -t cooked Cooked mode, Ctrl-C terminates 161 162config UNIPHIER_SERIAL 163 bool "Support for UniPhier on-chip UART" 164 depends on ARCH_UNIPHIER 165 help 166 If you have a UniPhier based board and want to use the on-chip 167 serial ports, say Y to this option. If unsure, say N. 168 169config X86_SERIAL 170 bool "Support for 16550 serial port on x86 machines" 171 depends on X86 172 default y 173 help 174 Most x86 machines have a ns16550 UART or compatible. This can be 175 enabled in the device tree with the correct input clock frequency 176 provided (default 1843200). Enable this to obtain serial console 177 output. 178 179endmenu 180