2 # Serial device configuration
11 Select a default baudrate, where "default" has a driver-specific
12 meaning of either setting the baudrate for the early debug UART
13 in the SPL stage (most drivers) or for choosing a default baudrate
14 in the absence of an environment setting (serial_mxc.c).
16 config REQUIRE_SERIAL_CONSOLE
17 bool "Require a serial port for console"
18 # Running without a serial console is not supported by the
23 Require a serial port for the console, and panic if none is found
24 during serial port initialization (default y). Set this to n on
25 boards which have no debug serial port whatsoever.
27 config SPECIFY_CONSOLE_INDEX
28 bool "Specify the port number used for console"
29 default y if !DM_SERIAL || (SPL && !SPL_DM_SERIAL) || \
30 (TPL && !TPL_DM_SERIAL)
32 In various cases, we need to specify which of the UART devices that
33 a board or SoC has available are to be used for the console device
37 bool "Provide a serial driver"
41 In very space-constrained devices even the full UART driver is too
42 large. In this case the debug UART can still be used in some cases.
43 This option enables the full UART in U-Boot, so if is it disabled,
44 the full UART driver will be omitted, thus saving space.
46 config SPL_SERIAL_PRESENT
47 bool "Provide a serial driver in SPL"
51 In very space-constrained devices even the full UART driver is too
52 large. In this case the debug UART can still be used in some cases.
53 This option enables the full UART in SPL, so if is it disabled,
54 the full UART driver will be omitted, thus saving space.
56 # Logic to allow us to use the imply keyword to set what the default port
57 # should be. The default is otherwise 1.
77 int "UART used for console"
78 depends on SPECIFY_CONSOLE_INDEX
80 default 0 if CONS_INDEX_0
81 default 2 if CONS_INDEX_2
82 default 3 if CONS_INDEX_3
83 default 4 if CONS_INDEX_4
84 default 5 if CONS_INDEX_5
85 default 6 if CONS_INDEX_6
88 Set this to match the UART number of the serial console.
91 bool "Enable Driver Model for serial drivers"
94 Enable driver model for serial. This replaces
95 drivers/serial/serial.c with the serial uclass, which
96 implements serial_putc() etc. The uclass interface is
97 defined in include/serial.h.
99 config SERIAL_RX_BUFFER
100 bool "Enable RX buffer for serial input"
103 Enable RX buffer support for the serial driver. This enables
104 pasting longer strings, even when the RX FIFO of the UART is
105 not big enough (e.g. 16 bytes on the normal NS16550).
107 config SERIAL_RX_BUFFER_SIZE
109 depends on SERIAL_RX_BUFFER
112 The size of the RX buffer (needs to be power of 2)
114 config SERIAL_SEARCH_ALL
115 bool "Search for serial devices after default one failed"
118 The serial subsystem only searches for a single serial device
119 that was instantiated, but does not check whether it was probed
120 correctly. With this option set, we make successful probing
121 mandatory and search for fallback serial devices if the default
122 device does not work.
127 bool "Enable Driver Model for serial drivers in SPL"
128 depends on DM_SERIAL && SPL_DM
131 Enable driver model for serial in SPL. This replaces
132 drivers/serial/serial.c with the serial uclass, which
133 implements serial_putc() etc. The uclass interface is
134 defined in include/serial.h.
137 bool "Enable Driver Model for serial drivers in TPL"
139 default y if TPL && DM_SERIAL
141 Enable driver model for serial in TPL. This replaces
142 drivers/serial/serial.c with the serial uclass, which
143 implements serial_putc() etc. The uclass interface is
144 defined in include/serial.h.
147 bool "Enable an early debug UART for debugging"
149 The debug UART is intended for use very early in U-Boot to debug
150 problems when an ICE or other debug mechanism is not available.
152 To use it you should:
153 - Make sure your UART supports this interface
154 - Enable CONFIG_DEBUG_UART
155 - Enable the CONFIG for your UART to tell it to provide this interface
156 (e.g. CONFIG_DEBUG_UART_NS16550)
157 - Define the required settings as needed (see below)
158 - Call debug_uart_init() before use
159 - Call debug_uart_putc() to output a character
161 Depending on your platform it may be possible to use this UART before
162 a stack is available.
164 If your UART does not support this interface you can probably add
165 support quite easily. Remember that you cannot use driver model and
166 it is preferred to use no stack.
168 You must not use this UART once driver model is working and the
169 serial drivers are up and running (done in serial_init()). Otherwise
170 the drivers may conflict and you will get strange output.
173 prompt "Select which UART will provide the debug UART"
174 depends on DEBUG_UART
175 default DEBUG_UART_NS16550
177 config DEBUG_UART_ALTERA_JTAGUART
178 bool "Altera JTAG UART"
180 Select this to enable a debug UART using the altera_jtag_uart driver.
181 You will need to provide parameters to make this work. The driver will
182 be available until the real driver model serial is running.
184 config DEBUG_UART_ALTERA_UART
187 Select this to enable a debug UART using the altera_uart driver.
188 You will need to provide parameters to make this work. The driver will
189 be available until the real driver model serial is running.
191 config DEBUG_UART_AR933X
192 bool "QCA/Atheros ar933x"
193 depends on AR933X_UART
195 Select this to enable a debug UART using the ar933x uart driver.
196 You will need to provide parameters to make this work. The
197 driver will be available until the real driver model serial is
200 config DEBUG_ARC_SERIAL
202 depends on ARC_SERIAL
204 Select this to enable a debug UART using the ARC UART driver.
205 You will need to provide parameters to make this work. The
206 driver will be available until the real driver model serial is
209 config DEBUG_UART_ATMEL
212 Select this to enable a debug UART using the atmel usart driver. You
213 will need to provide parameters to make this work. The driver will
214 be available until the real driver-model serial is running.
216 config DEBUG_UART_BCM6345
218 depends on BCM6345_SERIAL
220 Select this to enable a debug UART on BCM6345 SoCs. You
221 will need to provide parameters to make this work. The driver will
222 be available until the real driver model serial is running.
224 config DEBUG_UART_NS16550
227 Select this to enable a debug UART using the ns16550 driver. You
228 will need to provide parameters to make this work. The driver will
229 be available until the real driver model serial is running.
231 config DEBUG_EFI_CONSOLE
235 Select this to enable a debug console which calls back to EFI to
236 output to the console. This can be useful for early debugging of
237 U-Boot when running on top of EFI (Extensive Firmware Interface).
238 This is a type of BIOS used by PCs.
240 config DEBUG_UART_S5P
243 Select this to enable a debug UART using the serial_s5p driver. You
244 will need to provide parameters to make this work. The driver will
245 be available until the real driver-model serial is running.
247 config DEBUG_UART_MESON
249 depends on MESON_SERIAL
251 Select this to enable a debug UART using the serial_meson driver. You
252 will need to provide parameters to make this work. The driver will
253 be available until the real driver-model serial is running.
255 config DEBUG_UART_UARTLITE
256 bool "Xilinx Uartlite"
258 Select this to enable a debug UART using the serial_uartlite driver.
259 You will need to provide parameters to make this work. The driver will
260 be available until the real driver-model serial is running.
262 config DEBUG_UART_ARM_DCC
265 Select this to enable a debug UART using the ARM JTAG DCC port.
266 The DCC port can be used for very early debugging and doesn't require
267 any additional setting like address/baudrate/clock. On systems without
268 any serial interface this is the easiest way how to get console.
269 Every ARM core has own DCC port which is the part of debug interface.
270 This port is available at least on ARMv6, ARMv7, ARMv8 and XScale
273 config DEBUG_MVEBU_A3700_UART
274 bool "Marvell Armada 3700"
276 Select this to enable a debug UART using the serial_mvebu driver. You
277 will need to provide parameters to make this work. The driver will
278 be available until the real driver-model serial is running.
280 config DEBUG_UART_ZYNQ
283 Select this to enable a debug UART using the serial_zynq driver. You
284 will need to provide parameters to make this work. The driver will
285 be available until the real driver-model serial is running.
287 config DEBUG_UART_APBUART
289 bool "Gaisler APBUART"
291 Select this to enable a debug UART using the serial_leon3 driver. You
292 will need to provide parameters to make this work. The driver will
293 be available until the real driver model serial is running.
295 config DEBUG_UART_PL010
298 Select this to enable a debug UART using the pl01x driver with the
299 PL010 UART type. You will need to provide parameters to make this
300 work. The driver will be available until the real driver model
303 config DEBUG_UART_PL011
306 Select this to enable a debug UART using the pl01x driver with the
307 PL011 UART type. You will need to provide parameters to make this
308 work. The driver will be available until the real driver model
311 config DEBUG_UART_PIC32
312 bool "Microchip PIC32"
313 depends on PIC32_SERIAL
315 Select this to enable a debug UART using the serial_pic32 driver. You
316 will need to provide parameters to make this work. The driver will
317 be available until the real driver model serial is running.
319 config DEBUG_UART_MXC
320 bool "IMX Serial port"
323 Select this to enable a debug UART using the serial_mxc driver. You
324 will need to provide parameters to make this work. The driver will
325 be available until the real driver model serial is running.
327 config DEBUG_UART_SANDBOX
329 depends on SANDBOX_SERIAL
331 Select this to enable the debug UART using the sandbox driver. This
332 provides basic serial output from the console without needing to
333 start up driver model. The driver will be available until the real
334 driver model serial is running.
336 config DEBUG_UART_STM32
337 bool "STMicroelectronics STM32"
338 depends on STM32_SERIAL
340 Select this to enable a debug UART using the serial_stm32 driver
341 You will need to provide parameters to make this work.
342 The driver will be available until the real driver model
345 config DEBUG_UART_UNIPHIER
346 bool "UniPhier on-chip UART"
347 depends on ARCH_UNIPHIER
349 Select this to enable a debug UART using the UniPhier on-chip UART.
350 You will need to provide DEBUG_UART_BASE to make this work. The
351 driver will be available until the real driver-model serial is
354 config DEBUG_UART_OMAP
357 Select this to enable a debug UART using the omap ns16550 driver.
358 You will need to provide parameters to make this work. The driver
359 will be available until the real driver model serial is running.
363 config DEBUG_UART_BASE
364 hex "Base address of UART"
365 depends on DEBUG_UART
366 default 0 if DEBUG_UART_SANDBOX
368 This is the base address of your UART for memory-mapped UARTs.
370 A default should be provided by your board, but if not you will need
371 to use the correct value here.
373 config DEBUG_UART_CLOCK
374 int "UART input clock"
375 depends on DEBUG_UART
376 default 0 if DEBUG_UART_SANDBOX
378 The UART input clock determines the speed of the internal UART
379 circuitry. The baud rate is derived from this by dividing the input
382 A default should be provided by your board, but if not you will need
383 to use the correct value here.
385 config DEBUG_UART_SHIFT
386 int "UART register shift"
387 depends on DEBUG_UART
388 default 0 if DEBUG_UART
390 Some UARTs (notably ns16550) support different register layouts
391 where the registers are spaced either as bytes, words or some other
392 value. Use this value to specify the shift to use, where 0=byte
393 registers, 2=32-bit word registers, etc.
395 config DEBUG_UART_BOARD_INIT
396 bool "Enable board-specific debug UART init"
397 depends on DEBUG_UART
399 Some boards need to set things up before the debug UART can be used.
400 On these boards a call to debug_uart_init() is insufficient. When
401 this option is enabled, the function board_debug_uart_init() will
402 be called when debug_uart_init() is called. You can put any code
403 here that is needed to set up the UART ready for use, such as set
404 pin multiplexing or enable clocks.
406 config DEBUG_UART_ANNOUNCE
407 bool "Show a message when the debug UART starts up"
408 depends on DEBUG_UART
410 Enable this option to show a message when the debug UART is ready
411 for use. You will see a message like "<debug_uart> " as soon as
412 U-Boot has the UART ready for use (i.e. your code calls
413 debug_uart_init()). This can be useful just as a check that
414 everything is working.
416 config DEBUG_UART_SKIP_INIT
417 bool "Skip UART initialization"
419 Select this if the UART you want to use for debug output is already
420 initialized by the time U-Boot starts its execution.
422 config ALTERA_JTAG_UART
423 bool "Altera JTAG UART support"
426 Select this to enable an JTAG UART for Altera devices.The JTAG UART
427 core implements a method to communicate serial character streams
428 between a host PC and a Qsys system on an Altera FPGA. Please find
429 details on the "Embedded Peripherals IP User Guide" of Altera.
431 config ALTERA_JTAG_UART_BYPASS
432 bool "Bypass output when no connection"
433 depends on ALTERA_JTAG_UART
435 Bypass console output and keep going even if there is no JTAG
436 terminal connection with the host. The console output will resume
437 once the JTAG terminal is connected. Without the bypass, the console
438 output will wait forever until a JTAG terminal is connected. If you
442 bool "Altera UART support"
445 Select this to enable an UART for Altera devices. Please find
446 details on the "Embedded Peripherals IP User Guide" of Altera.
449 bool "QCA/Atheros ar933x UART support"
450 depends on DM_SERIAL && SOC_AR933X
452 Select this to enable UART support for QCA/Atheros ar933x
453 devices. This driver uses driver model and requires a device
454 tree binding to operate, please refer to the document at
455 doc/device-tree-bindings/serial/qca,ar9330-uart.txt.
458 bool "ARC UART support"
461 Select this to enable support for ARC UART now typically
462 only used in Synopsys DesignWare ARC simulators like nSIM.
465 bool "Atmel USART support"
467 Select this to enable USART support for Atmel SoCs. It can be
468 configured in the device tree, and input clock frequency can
469 be got from the clk node.
471 config BCM283X_MU_SERIAL
472 bool "Support for BCM283x Mini-UART"
473 depends on DM_SERIAL && ARCH_BCM283X
476 Select this to enable Mini-UART support on BCM283X family of SoCs.
478 config BCM283X_PL011_SERIAL
479 bool "Support for BCM283x PL011 UART"
480 depends on PL01X_SERIAL && ARCH_BCM283X
483 Select this to enable an overriding PL011 driver for BCM283X SoCs
484 that supports automatic disable, so that it only gets used when
485 the UART is actually muxed.
487 config BCM6345_SERIAL
488 bool "Support for BCM6345 UART"
489 depends on DM_SERIAL && ARCH_BMIPS
491 Select this to enable UART on BCM6345 SoCs.
493 config FSL_LINFLEXUART
494 bool "Freescale Linflex UART support"
497 Select this to enable the Linflex serial module found on some
498 NXP SoCs like S32V234.
501 bool "Freescale LPUART support"
503 Select this to enable a Low Power UART for Freescale VF610 and
504 QorIQ Layerscape devices.
506 config MVEBU_A3700_UART
507 bool "UART support for Armada 3700"
510 Choose this option to add support for UART driver on the Marvell
511 Armada 3700 SoC. The base address is configured via DT.
514 bool "IMX serial port support"
515 depends on MX5 || MX6
517 If you have a machine based on a Motorola IMX CPU you
518 can enable its onboard serial port by enabling this option.
520 config NULLDEV_SERIAL
521 bool "Null serial device"
523 Select this to enable null serial device support. A null serial
524 device merely acts as a placeholder for a serial device and does
525 nothing for all it's operation.
528 bool "Support for Microchip PIC32 on-chip UART"
529 depends on DM_SERIAL && MACH_PIC32
532 Support for the UART found on Microchip PIC32 SoC's.
535 bool "NS16550 UART or compatible"
537 Support NS16550 UART or compatible. This can be enabled in the
538 device tree with the correct input clock frequency. If the input
539 clock frequency is not defined in the device tree, the macro
540 CONFIG_SYS_NS16550_CLK defined in a legacy board header file will
541 be used. It can be a constant or a function to get clock, eg,
544 config INTEL_MID_SERIAL
545 bool "Intel MID platform UART support"
546 depends on DM_SERIAL && OF_CONTROL
550 Select this to enable a UART for Intel MID platforms.
551 This uses the ns16550 driver as a library.
554 bool "ARM PL010 driver"
555 depends on !DM_SERIAL
557 Select this to enable a UART for platforms using PL010.
560 bool "ARM PL011 driver"
561 depends on !DM_SERIAL
563 Select this to enable a UART for platforms using PL011.
566 bool "ARM PL010 and PL011 driver"
569 Select this to enable a UART for platforms using PL010 or PL011.
571 config ROCKCHIP_SERIAL
572 bool "Rockchip on-chip UART support"
573 depends on DM_SERIAL && SPL_OF_PLATDATA
575 Select this to enable a debug UART for Rockchip devices when using
576 CONFIG_SPL_OF_PLATDATA (i.e. a compiled-in device tree replacemenmt).
577 This uses the ns16550 driver, converting the platdata from of-platdata
578 to the ns16550 format.
580 config SANDBOX_SERIAL
581 bool "Sandbox UART support"
584 Select this to enable a seral UART for sandbox. This is required to
585 operate correctly, otherwise you will see no serial output from
586 sandbox. The emulated UART will display to the console and console
587 input will be fed into the UART. This allows you to interact with
590 The operation of the console is controlled by the -t command-line
591 flag. In raw mode, U-Boot sees all characters from the terminal
592 before they are processed, including Ctrl-C. In cooked mode, Ctrl-C
593 is processed by the terminal, and terminates U-Boot. Valid options
596 -t raw-with-sigs Raw mode, Ctrl-C will terminate U-Boot
597 -t raw Raw mode, Ctrl-C is processed by U-Boot
598 -t cooked Cooked mode, Ctrl-C terminates
601 bool "Renesas SCIF UART support"
602 depends on SH || ARCH_RMOBILE
604 Select this to enable Renesas SCIF UART. To operate serial ports
605 on systems with RCar or SH SoCs, say Y to this option. If unsure,
608 config UNIPHIER_SERIAL
609 bool "Support for UniPhier on-chip UART"
610 depends on ARCH_UNIPHIER
613 If you have a UniPhier based board and want to use the on-chip
614 serial ports, say Y to this option. If unsure, say N.
616 config XILINX_UARTLITE
617 bool "Xilinx Uarlite support"
618 depends on DM_SERIAL && (MICROBLAZE || ARCH_ZYNQ || ARCH_ZYNQMP || 4xx)
620 If you have a Xilinx based board and want to use the uartlite
621 serial ports, say Y to this option. If unsure, say N.
624 bool "Support for Amlogic Meson UART"
625 depends on DM_SERIAL && ARCH_MESON
627 If you have an Amlogic Meson based board and want to use the on-chip
628 serial ports, say Y to this option. If unsure, say N.
631 bool "Qualcomm on-chip UART"
634 Support Data Mover UART used on Qualcomm Snapdragon SoCs.
635 It should support all Qualcomm devices with UARTDM version 1.4,
636 for example APQ8016 and MSM8916.
637 Single baudrate is supported in current implementation (115200).
640 bool "Support for OMAP specific UART"
642 default y if (ARCH_OMAP2PLUS || ARCH_K3)
645 If you have an TI based SoC and want to use the on-chip serial
646 port, say Y to this option. If unsure say N.
649 bool "Actions Semi OWL UART"
650 depends on DM_SERIAL && ARCH_OWL
652 If you have a Actions Semi OWL based board and want to use the on-chip
653 serial port, say Y to this option. If unsure, say N.
654 Single baudrate is supported in current implementation (115200).
657 bool "PXA serial port support"
659 If you have a machine based on a Marvell XScale PXA2xx CPU you
660 can enable its onboard serial ports by enabling this option.
662 config STI_ASC_SERIAL
663 bool "STMicroelectronics on-chip UART"
664 depends on DM_SERIAL && ARCH_STI
666 Select this to enable Asynchronous Serial Controller available
667 on STiH410 SoC. This is a basic implementation, it supports
668 following baudrate 9600, 19200, 38400, 57600 and 115200.
671 bool "STMicroelectronics STM32 SoCs on-chip UART"
672 depends on DM_SERIAL && (STM32F4 || STM32F7 || STM32H7 || ARCH_STM32MP)
674 If you have a machine based on a STM32 F4, F7, H7 or MP1 SOC
675 you can enable its onboard serial ports, say Y to this option.
679 bool "Cadence (Xilinx Zynq) UART support"
680 depends on DM_SERIAL && (MICROBLAZE || ARCH_ZYNQ || ARCH_ZYNQMP || ARCH_ZYNQMP_R5)
682 This driver supports the Cadence UART. It is found e.g. in Xilinx
686 bool "Console driver for MPC8XX"
691 prompt "Console port"
692 default 8xx_CONS_SMC1
693 depends on MPC8XX_CONS
695 Depending on board, select one serial port
696 (CONFIG_8xx_CONS_SMC1 or CONFIG_8xx_CONS_SMC2)
706 config SYS_SMC_RXBUFLEN
707 int "Console Rx buffer length"
708 depends on MPC8XX_CONS
711 With CONFIG_SYS_SMC_RXBUFLEN it is possible to define
712 the maximum receive buffer length for the SMC.
713 This option is actual only for 8xx possible.
714 If using CONFIG_SYS_SMC_RXBUFLEN also CONFIG_SYS_MAXIDLE
715 must be defined, to setup the maximum idle timeout for
719 int "maximum idle timeout"
720 depends on MPC8XX_CONS
723 config SYS_BRGCLK_PRESCALE
724 int "BRG Clock Prescale"
725 depends on MPC8XX_CONS
730 depends on MPC8XX_CONS
735 depends on MPC8XX_CONS