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_ALTERA_JTAGUART
58 bool "Altera JTAG UART"
60 Select this to enable a debug UART using the altera_jtag_uart driver.
61 You 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_UART_ALTERA_UART
67 Select this to enable a debug UART using the altera_uart driver.
68 You will need to provide parameters to make this work. The driver will
69 be available until the real driver model serial is running.
71 config DEBUG_UART_NS16550
74 Select this to enable a debug UART using the ns16550 driver. You
75 will need to provide parameters to make this work. The driver will
76 be available until the real driver model serial is running.
78 config DEBUG_EFI_CONSOLE
82 Select this to enable a debug console which calls back to EFI to
83 output to the console. This can be useful for early debugging of
84 U-Boot when running on top of EFI (Extensive Firmware Interface).
85 This is a type of BIOS used by PCs.
90 Select this to enable a debug UART using the serial_s5p driver. You
91 will need to provide parameters to make this work. The driver will
92 be available until the real driver-model serial is running.
94 config DEBUG_UART_ZYNQ
97 Select this to enable a debug UART using the serial_s5p driver. You
98 will need to provide parameters to make this work. The driver will
99 be available until the real driver-model serial is running.
103 config DEBUG_UART_BASE
104 hex "Base address of UART"
105 depends on DEBUG_UART
107 This is the base address of your UART for memory-mapped UARTs.
109 A default should be provided by your board, but if not you will need
110 to use the correct value here.
112 config DEBUG_UART_CLOCK
113 int "UART input clock"
114 depends on DEBUG_UART
116 The UART input clock determines the speed of the internal UART
117 circuitry. The baud rate is derived from this by dividing the input
120 A default should be provided by your board, but if not you will need
121 to use the correct value here.
123 config DEBUG_UART_SHIFT
124 int "UART register shift"
125 depends on DEBUG_UART
126 default 0 if DEBUG_UART
128 Some UARTs (notably ns16550) support different register layouts
129 where the registers are spaced either as bytes, words or some other
130 value. Use this value to specify the shift to use, where 0=byte
131 registers, 2=32-bit word registers, etc.
133 config DEBUG_UART_BOARD_INIT
134 bool "Enable board-specific debug UART init"
135 depends on DEBUG_UART
137 Some boards need to set things up before the debug UART can be used.
138 On these boards a call to debug_uart_init() is insufficient. When
139 this option is enabled, the function board_debug_uart_init() will
140 be called when debug_uart_init() is called. You can put any code
141 here that is needed to set up the UART ready for use, such as set
142 pin multiplexing or enable clocks.
144 config DEBUG_UART_ANNOUNCE
145 bool "Show a message when the debug UART starts up"
146 depends on DEBUG_UART
148 Enable this option to show a message when the debug UART is ready
149 for use. You will see a message like "<debug_uart> " as soon as
150 U-Boot has the UART ready for use (i.e. your code calls
151 debug_uart_init()). This can be useful just as a check that
152 everything is working.
154 config ALTERA_JTAG_UART
155 bool "Altera JTAG UART support"
158 Select this to enable an JTAG UART for Altera devices.The JTAG UART
159 core implements a method to communicate serial character streams
160 between a host PC and a Qsys system on an Altera FPGA. Please find
161 details on the "Embedded Peripherals IP User Guide" of Altera.
163 config ALTERA_JTAG_UART_BYPASS
164 bool "Bypass output when no connection"
165 depends on ALTERA_JTAG_UART
167 Bypass console output and keep going even if there is no JTAG
168 terminal connection with the host. The console output will resume
169 once the JTAG terminal is connected. Without the bypass, the console
170 output will wait forever until a JTAG terminal is connected. If you
174 bool "Altera UART support"
177 Select this to enable an UART for Altera devices. Please find
178 details on the "Embedded Peripherals IP User Guide" of Altera.
180 config ROCKCHIP_SERIAL
181 bool "Rockchip on-chip UART support"
182 depends on ARCH_ROCKCHIP && DM_SERIAL
184 Select this to enable a debug UART for Rockchip devices. This uses
185 the ns16550 driver. You will need to #define CONFIG_SYS_NS16550 in
186 your board config header. The clock input is automatically set to
187 use the oscillator (24MHz).
189 config SANDBOX_SERIAL
190 bool "Sandbox UART support"
193 Select this to enable a seral UART for sandbox. This is required to
194 operate correctly, otherwise you will see no serial output from
195 sandbox. The emulated UART will display to the console and console
196 input will be fed into the UART. This allows you to interact with
199 The operation of the console is controlled by the -t command-line
200 flag. In raw mode, U-Boot sees all characters from the terminal
201 before they are processed, including Ctrl-C. In cooked mode, Ctrl-C
202 is processed by the terminal, and terminates U-Boot. Valid options
205 -t raw-with-sigs Raw mode, Ctrl-C will terminate U-Boot
206 -t raw Raw mode, Ctrl-C is processed by U-Boot
207 -t cooked Cooked mode, Ctrl-C terminates
209 config UNIPHIER_SERIAL
210 bool "Support for UniPhier on-chip UART"
211 depends on ARCH_UNIPHIER
213 If you have a UniPhier based board and want to use the on-chip
214 serial ports, say Y to this option. If unsure, say N.
217 bool "Support for 16550 serial port on x86 machines"
221 Most x86 machines have a ns16550 UART or compatible. This can be
222 enabled in the device tree with the correct input clock frequency
223 provided (default 1843200). Enable this to obtain serial console