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 SANDBOX_SERIAL 113 bool "Sandbox UART support" 114 depends on SANDBOX && DM 115 help 116 Select this to enable a seral UART for sandbox. This is required to 117 operate correctly, otherwise you will see no serial output from 118 sandbox. The emulated UART will display to the console and console 119 input will be fed into the UART. This allows you to interact with 120 U-Boot. 121 122 The operation of the console is controlled by the -t command-line 123 flag. In raw mode, U-Boot sees all characters from the terminal 124 before they are processed, including Ctrl-C. In cooked mode, Ctrl-C 125 is processed by the terminal, and terminates U-Boot. Valid options 126 are: 127 128 -t raw-with-sigs Raw mode, Ctrl-C will terminate U-Boot 129 -t raw Raw mode, Ctrl-C is processed by U-Boot 130 -t cooked Cooked mode, Ctrl-C terminates 131 132config UNIPHIER_SERIAL 133 bool "Support for UniPhier on-chip UART" 134 depends on ARCH_UNIPHIER && DM_SERIAL 135 help 136 If you have a UniPhier based board and want to use the on-chip 137 serial ports, say Y to this option. If unsure, say N. 138 139config X86_SERIAL 140 bool "Support for 16550 serial port on x86 machines" 141 depends on X86 142 default y 143 help 144 Most x86 machines have a ns16550 UART or compatible. This can be 145 enabled in the device tree with the correct input clock frequency 146 provided (default 1843200). Enable this to obtain serial console 147 output. 148 149endmenu 150