1 config REQUIRE_SERIAL_CONSOLE
2 bool "Require a serial port for console"
3 # Running without a serial console is not supported by the
8 Require a serial port for the console, and panic if none is found
9 during serial port initialization (default y). Set this to n on
10 boards which have no debug serial port whatsoever.
13 bool "Enable Driver Model for serial drivers"
16 Enable driver model for serial. This replaces
17 drivers/serial/serial.c with the serial uclass, which
18 implements serial_putc() etc. The uclass interface is
19 defined in include/serial.h.
22 bool "Enable an early debug UART for debugging"
24 The debug UART is intended for use very early in U-Boot to debug
25 problems when an ICE or other debug mechanism is not available.
28 - Make sure your UART supports this interface
29 - Enable CONFIG_DEBUG_UART
30 - Enable the CONFIG for your UART to tell it to provide this interface
31 (e.g. CONFIG_DEBUG_UART_NS16550)
32 - Define the required settings as needed (see below)
33 - Call debug_uart_init() before use
34 - Call debug_uart_putc() to output a character
36 Depending on your platform it may be possible to use this UART before
39 If your UART does not support this interface you can probably add
40 support quite easily. Remember that you cannot use driver model and
41 it is preferred to use no stack.
43 You must not use this UART once driver model is working and the
44 serial drivers are up and running (done in serial_init()). Otherwise
45 the drivers may conflict and you will get strange output.
48 prompt "Select which UART will provide the debug UART"
51 config DEBUG_UART_NS16550
54 Select this to enable a debug UART using the ns16550 driver. You
55 will need to provide parameters to make this work. The driver will
56 be available until the real driver model serial is running.
58 config DEBUG_EFI_CONSOLE
62 Select this to enable a debug console which calls back to EFI to
63 output to the console. This can be useful for early debugging of
64 U-Boot when running on top of EFI (Extensive Firmware Interface).
65 This is a type of BIOS used by PCs.
70 Select this to enable a debug UART using the serial_s5p driver. You
71 will need to provide parameters to make this work. The driver will
72 be available until the real driver-model serial is running.
76 config DEBUG_UART_BASE
77 hex "Base address of UART"
80 This is the base address of your UART for memory-mapped UARTs.
82 A default should be provided by your board, but if not you will need
83 to use the correct value here.
85 config DEBUG_UART_CLOCK
86 int "UART input clock"
89 The UART input clock determines the speed of the internal UART
90 circuitry. The baud rate is derived from this by dividing the input
93 A default should be provided by your board, but if not you will need
94 to use the correct value here.
96 config DEBUG_UART_SHIFT
97 int "UART register shift"
99 default 0 if DEBUG_UART
101 Some UARTs (notably ns16550) support different register layouts
102 where the registers are spaced either as bytes, words or some other
103 value. Use this value to specify the shift to use, where 0=byte
104 registers, 2=32-bit word registers, etc.
106 config SANDBOX_SERIAL
107 bool "Sandbox UART support"
108 depends on SANDBOX && DM
110 Select this to enable a seral UART for sandbox. This is required to
111 operate correctly, otherwise you will see no serial output from
112 sandbox. The emulated UART will display to the console and console
113 input will be fed into the UART. This allows you to interact with
116 The operation of the console is controlled by the -t command-line
117 flag. In raw mode, U-Boot sees all characters from the terminal
118 before they are processed, including Ctrl-C. In cooked mode, Ctrl-C
119 is processed by the terminal, and terminates U-Boot. Valid options
122 -t raw-with-sigs Raw mode, Ctrl-C will terminate U-Boot
123 -t raw Raw mode, Ctrl-C is processed by U-Boot
124 -t cooked Cooked mode, Ctrl-C terminates
126 config UNIPHIER_SERIAL
127 bool "Support for UniPhier on-chip UART"
128 depends on ARCH_UNIPHIER && DM_SERIAL
130 If you have a UniPhier based board and want to use the on-chip
131 serial ports, say Y to this option. If unsure, say N.
134 bool "Support for 16550 serial port on x86 machines"
138 Most x86 machines have a ns16550 UART or compatible. This can be
139 enabled in the device tree with the correct input clock frequency
140 provided (default 1843200). Enable this to obtain serial console