2 # Serial device configuration
7 config REQUIRE_SERIAL_CONSOLE
8 bool "Require a serial port for console"
9 # Running without a serial console is not supported by the
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.
19 bool "Enable Driver Model for serial drivers"
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.
28 bool "Enable an early debug UART for debugging"
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.
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
42 Depending on your platform it may be possible to use this UART before
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.
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.
54 prompt "Select which UART will provide the debug UART"
57 config DEBUG_UART_NS16550
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.
64 config DEBUG_EFI_CONSOLE
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.
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.
82 config DEBUG_UART_BASE
83 hex "Base address of UART"
86 This is the base address of your UART for memory-mapped UARTs.
88 A default should be provided by your board, but if not you will need
89 to use the correct value here.
91 config DEBUG_UART_CLOCK
92 int "UART input clock"
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
99 A default should be provided by your board, but if not you will need
100 to use the correct value here.
102 config DEBUG_UART_SHIFT
103 int "UART register shift"
104 depends on DEBUG_UART
105 default 0 if DEBUG_UART
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.
112 config SANDBOX_SERIAL
113 bool "Sandbox UART support"
114 depends on SANDBOX && DM
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
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
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
132 config UNIPHIER_SERIAL
133 bool "Support for UniPhier on-chip UART"
134 depends on ARCH_UNIPHIER && DM_SERIAL
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.
140 bool "Support for 16550 serial port on x86 machines"
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