1config DM_SERIAL 2 bool "Enable Driver Model for serial drivers" 3 depends on DM 4 help 5 Enable driver model for serial. This replaces 6 drivers/serial/serial.c with the serial uclass, which 7 implements serial_putc() etc. The uclass interface is 8 defined in include/serial.h. 9 10config DEBUG_UART 11 bool "Enable an early debug UART for debugging" 12 help 13 The debug UART is intended for use very early in U-Boot to debug 14 problems when an ICE or other debug mechanism is not available. 15 16 To use it you should: 17 - Make sure your UART supports this interface 18 - Enable CONFIG_DEBUG_UART 19 - Enable the CONFIG for your UART to tell it to provide this interface 20 (e.g. CONFIG_DEBUG_UART_NS16550) 21 - Define the required settings as needed (see below) 22 - Call debug_uart_init() before use 23 - Call debug_uart_putc() to output a character 24 25 Depending on your platform it may be possible to use this UART before 26 a stack is available. 27 28 If your UART does not support this interface you can probably add 29 support quite easily. Remember that you cannot use driver model and 30 it is preferred to use no stack. 31 32 You must not use this UART once driver model is working and the 33 serial drivers are up and running (done in serial_init()). Otherwise 34 the drivers may conflict and you will get strange output. 35 36choice 37 prompt "Select which UART will provide the debug UART" 38 depends on DEBUG_UART 39 40config DEBUG_UART_NS16550 41 bool "ns16550" 42 help 43 Select this to enable a debug UART using the ns16550 driver. You 44 will need to provide parameters to make this work. The driver will 45 be available until the real driver model serial is running. 46 47config DEBUG_EFI_CONSOLE 48 bool "EFI" 49 depends on EFI_APP 50 help 51 Select this to enable a debug console which calls back to EFI to 52 output to the console. This can be useful for early debugging of 53 U-Boot when running on top of EFI (Extensive Firmware Interface). 54 This is a type of BIOS used by PCs. 55 56config DEBUG_UART_S5P 57 bool "Samsung S5P" 58 help 59 Select this to enable a debug UART using the serial_s5p driver. You 60 will need to provide parameters to make this work. The driver will 61 be available until the real driver-model serial is running. 62 63endchoice 64 65config DEBUG_UART_BASE 66 hex "Base address of UART" 67 depends on DEBUG_UART 68 help 69 This is the base address of your UART for memory-mapped UARTs. 70 71 A default should be provided by your board, but if not you will need 72 to use the correct value here. 73 74config DEBUG_UART_CLOCK 75 int "UART input clock" 76 depends on DEBUG_UART 77 help 78 The UART input clock determines the speed of the internal UART 79 circuitry. The baud rate is derived from this by dividing the input 80 clock down. 81 82 A default should be provided by your board, but if not you will need 83 to use the correct value here. 84 85config DEBUG_UART_SHIFT 86 int "UART register shift" 87 depends on DEBUG_UART 88 default 0 if DEBUG_UART 89 help 90 Some UARTs (notably ns16550) support different register layouts 91 where the registers are spaced either as bytes, words or some other 92 value. Use this value to specify the shift to use, where 0=byte 93 registers, 2=32-bit word registers, etc. 94 95config SANDBOX_SERIAL 96 bool "Sandbox UART support" 97 depends on SANDBOX && DM 98 help 99 Select this to enable a seral UART for sandbox. This is required to 100 operate correctly, otherwise you will see no serial output from 101 sandbox. The emulated UART will display to the console and console 102 input will be fed into the UART. This allows you to interact with 103 U-Boot. 104 105 The operation of the console is controlled by the -t command-line 106 flag. In raw mode, U-Boot sees all characters from the terminal 107 before they are processed, including Ctrl-C. In cooked mode, Ctrl-C 108 is processed by the terminal, and terminates U-Boot. Valid options 109 are: 110 111 -t raw-with-sigs Raw mode, Ctrl-C will terminate U-Boot 112 -t raw Raw mode, Ctrl-C is processed by U-Boot 113 -t cooked Cooked mode, Ctrl-C terminates 114 115config UNIPHIER_SERIAL 116 bool "Support for UniPhier on-chip UART" 117 depends on ARCH_UNIPHIER && DM_SERIAL 118 help 119 If you have a UniPhier based board and want to use the on-chip 120 serial ports, say Y to this option. If unsure, say N. 121 122config X86_SERIAL 123 bool "Support for 16550 serial port on x86 machines" 124 depends on X86 125 default y 126 help 127 Most x86 machines have a ns16550 UART or compatible. This can be 128 enabled in the device tree with the correct input clock frequency 129 provided (default 1843200). Enable this to obtain serial console 130 output. 131