2 # Serial device configuration
9 Enable support for serial drivers. This allows use of a serial UART
10 for displaying messages while U-Boot is running. It also brings in
11 printf() and panic() functions. This should normally be enabled
12 unless there are space reasons not to. If you just need to disable
13 the console you can adjust the stdout environment variable or use
19 int "Default baudrate"
22 Select a default baudrate, where "default" has a driver-specific
23 meaning of either setting the baudrate for the early debug UART
24 in the SPL stage (most drivers) or for choosing a default baudrate
25 in the absence of an environment setting (serial_mxc.c).
27 config REQUIRE_SERIAL_CONSOLE
28 bool "Require a serial port for console"
29 # Running without a serial console is not supported by the
34 Require a serial port for the console, and panic if none is found
35 during serial port initialization (default y). Set this to n on
36 boards which have no debug serial port whatsoever.
38 config SPECIFY_CONSOLE_INDEX
39 bool "Specify the port number used for console"
40 default y if !DM_SERIAL || (SPL && !SPL_DM_SERIAL) || \
41 (TPL && !TPL_DM_SERIAL)
43 In various cases, we need to specify which of the UART devices that
44 a board or SoC has available are to be used for the console device
48 bool "Provide a serial driver"
52 In very space-constrained devices even the full UART driver is too
53 large. In this case the debug UART can still be used in some cases.
54 This option enables the full UART in U-Boot, so if is it disabled,
55 the full UART driver will be omitted, thus saving space.
57 config SPL_SERIAL_PRESENT
58 bool "Provide a serial driver in SPL"
59 depends on DM_SERIAL && SPL
62 In very space-constrained devices even the full UART driver is too
63 large. In this case the debug UART can still be used in some cases.
64 This option enables the full UART in SPL, so if is it disabled,
65 the full UART driver will be omitted, thus saving space.
67 config TPL_SERIAL_PRESENT
68 bool "Provide a serial driver in TPL"
69 depends on DM_SERIAL && TPL
72 In very space-constrained devices even the full UART driver is too
73 large. In this case the debug UART can still be used in some cases.
74 This option enables the full UART in TPL, so if is it disabled,
75 the full UART driver will be omitted, thus saving space.
77 config VPL_SERIAL_PRESENT
78 bool "Provide a serial driver in VPL"
79 depends on DM_SERIAL && VPL
82 In very space-constrained devices even the full UART driver is too
83 large. In this case the debug UART can still be used in some cases.
84 This option enables the full UART in TPL, so if is it disabled,
85 the full UART driver will be omitted, thus saving space.
88 int "UART used for console"
89 depends on SPECIFY_CONSOLE_INDEX
93 Set this to match the UART number of the serial console.
96 bool "Enable Driver Model for serial drivers"
100 Enable driver model for serial. This replaces
101 drivers/serial/serial.c with the serial uclass, which
102 implements serial_putc() etc. The uclass interface is
103 defined in include/serial.h.
105 config SERIAL_RX_BUFFER
106 bool "Enable RX buffer for serial input"
109 Enable RX buffer support for the serial driver. This enables
110 pasting longer strings, even when the RX FIFO of the UART is
111 not big enough (e.g. 16 bytes on the normal NS16550).
113 config SERIAL_RX_BUFFER_SIZE
115 depends on SERIAL_RX_BUFFER
118 The size of the RX buffer (needs to be power of 2)
121 bool "Enable printing strings all at once"
124 Some serial drivers are much more efficient when printing multiple
125 characters at once rather than printing characters individually. This
126 can be because they can load a fifo, or because individual print
127 calls have a constant overhead. With this option set, the serial
128 subsystem will try to provide serial drivers with as many characters
129 at once as possible, instead of printing characters one by one. Most
130 serial drivers do not need this config to print efficiently. If
133 config SERIAL_SEARCH_ALL
134 bool "Search for serial devices after default one failed"
137 The serial subsystem only searches for a single serial device
138 that was instantiated, but does not check whether it was probed
139 correctly. With this option set, we make successful probing
140 mandatory and search for fallback serial devices if the default
141 device does not work.
145 config SERIAL_PROBE_ALL
146 bool "Probe all available serial devices"
149 The serial subsystem only probes for a single serial device,
150 but does not probe for other remaining serial devices.
151 With this option set, we make probing and searching for
152 all available devices optional.
153 Normally, U-Boot talks to one serial port at a time, but SBSA
154 compliant UART devices like PL011 require initialization
155 by firmware and to let the kernel use serial port for sending
156 and receiving the characters.
161 bool "Enable Driver Model for serial drivers in SPL"
162 depends on DM_SERIAL && SPL_DM
163 select SYS_SPL_MALLOC_F
166 Enable driver model for serial in SPL. This replaces
167 drivers/serial/serial.c with the serial uclass, which
168 implements serial_putc() etc. The uclass interface is
169 defined in include/serial.h.
172 bool "Enable Driver Model for serial drivers in TPL"
173 depends on DM_SERIAL && TPL_DM
174 select SYS_TPL_MALLOC_F
175 default y if TPL && DM_SERIAL
177 Enable driver model for serial in TPL. This replaces
178 drivers/serial/serial.c with the serial uclass, which
179 implements serial_putc() etc. The uclass interface is
180 defined in include/serial.h.
183 bool "Enable Driver Model for serial drivers in VPL"
185 default y if VPL && DM_SERIAL
187 Enable driver model for serial in VPL. This replaces
188 drivers/serial/serial.c with the serial uclass, which
189 implements serial_putc() etc. The uclass interface is
190 defined in include/serial.h.
193 bool "Enable an early debug UART for debugging"
195 The debug UART is intended for use very early in U-Boot to debug
196 problems when an ICE or other debug mechanism is not available.
198 To use it you should:
199 - Make sure your UART supports this interface
200 - Enable CONFIG_DEBUG_UART
201 - Enable the CONFIG for your UART to tell it to provide this interface
202 (e.g. CONFIG_DEBUG_UART_NS16550)
203 - Define the required settings as needed (see below)
204 - Call debug_uart_init() before use
205 - Call debug_uart_putc() to output a character
207 Depending on your platform it may be possible to use this UART before
208 a stack is available.
210 If your UART does not support this interface you can probably add
211 support quite easily. Remember that you cannot use driver model and
212 it is preferred to use no stack.
214 You must not use this UART once driver model is working and the
215 serial drivers are up and running (done in serial_init()). Otherwise
216 the drivers may conflict and you will get strange output.
219 prompt "Select which UART will provide the debug UART"
220 depends on DEBUG_UART
221 default DEBUG_SBI_CONSOLE if RISCV_SMODE
222 default DEBUG_UART_NS16550
224 config DEBUG_UART_ALTERA_JTAGUART
225 bool "Altera JTAG UART"
226 depends on ALTERA_JTAG_UART
228 Select this to enable a debug UART using the altera_jtag_uart driver.
229 You will need to provide parameters to make this work. The driver will
230 be available until the real driver model serial is running.
232 config DEBUG_UART_ALTERA_UART
234 depends on ALTERA_UART
236 Select this to enable a debug UART using the altera_uart driver.
237 You will need to provide parameters to make this work. The driver will
238 be available until the real driver model serial is running.
240 config DEBUG_UART_AR933X
241 bool "QCA/Atheros ar933x"
242 depends on AR933X_UART
244 Select this to enable a debug UART using the ar933x uart driver.
245 You will need to provide parameters to make this work. The
246 driver will be available until the real driver model serial is
249 config DEBUG_ARC_SERIAL
251 depends on ARC_SERIAL
253 Select this to enable a debug UART using the ARC UART driver.
254 You will need to provide parameters to make this work. The
255 driver will be available until the real driver model serial is
258 config DEBUG_UART_ATMEL
260 depends on ATMEL_USART
262 Select this to enable a debug UART using the atmel usart driver. You
263 will need to provide parameters to make this work. The driver will
264 be available until the real driver-model serial is running.
266 config DEBUG_UART_BCM6345
268 depends on BCM6345_SERIAL
270 Select this to enable a debug UART on BCM6345 SoCs. You
271 will need to provide parameters to make this work. The driver will
272 be available until the real driver model serial is running.
274 config DEBUG_UART_NS16550
276 depends on SYS_NS16550
278 Select this to enable a debug UART using the ns16550 driver. You
279 will need to provide parameters to make this work. The driver will
280 be available until the real driver model serial is running.
282 config DEBUG_EFI_CONSOLE
286 Select this to enable a debug console which calls back to EFI to
287 output to the console. This can be useful for early debugging of
288 U-Boot when running on top of EFI (Extensive Firmware Interface).
289 This is a type of BIOS used by PCs.
291 config DEBUG_SBI_CONSOLE
293 depends on RISCV_SMODE
295 Select this to enable a debug console which calls back to SBI to
296 output to the console. This can be useful for early debugging of
297 U-Boot when running on top of SBI (Supervisor Binary Interface).
298 This implementation of the debug UART is not available while in
299 M-mode (e.g. during SPL).
301 config DEBUG_UART_S5P
303 depends on ARCH_APPLE || ARCH_EXYNOS || ARCH_S5PC1XX
305 Select this to enable a debug UART using the serial_s5p driver. You
306 will need to provide parameters to make this work. The driver will
307 be available until the real driver-model serial is running.
309 config DEBUG_UART_MSM_GENI
310 bool "Qualcomm snapdragon"
311 depends on ARCH_SNAPDRAGON
313 Select this to enable a debug UART using the serial_msm driver. You
314 will need to provide parameters to make this work. The driver will
315 be available until the real driver-model serial is running.
317 config DEBUG_UART_MESON
319 depends on MESON_SERIAL
321 Select this to enable a debug UART using the serial_meson driver. You
322 will need to provide parameters to make this work. The driver will
323 be available until the real driver-model serial is running.
325 config DEBUG_UART_UARTLITE
326 bool "Xilinx Uartlite"
327 depends on XILINX_UARTLITE
329 Select this to enable a debug UART using the serial_uartlite driver.
330 You will need to provide parameters to make this work. The driver will
331 be available until the real driver-model serial is running.
333 config DEBUG_UART_ARM_DCC
337 Select this to enable a debug UART using the ARM JTAG DCC port.
338 The DCC port can be used for very early debugging and doesn't require
339 any additional setting like address/baudrate/clock. On systems without
340 any serial interface this is the easiest way how to get console.
341 Every ARM core has own DCC port which is the part of debug interface.
342 This port is available at least on ARMv6, ARMv7, ARMv8 and XScale
345 config DEBUG_MVEBU_A3700_UART
346 bool "Marvell Armada 3700"
347 depends on MVEBU_A3700_UART
349 Select this to enable a debug UART using the serial_mvebu driver. You
350 will need to provide parameters to make this work. The driver will
351 be available until the real driver-model serial is running.
353 config DEBUG_UART_ZYNQ
355 depends on ZYNQ_SERIAL
357 Select this to enable a debug UART using the serial_zynq driver. You
358 will need to provide parameters to make this work. The driver will
359 be available until the real driver-model serial is running.
361 config DEBUG_UART_APBUART
363 bool "Gaisler APBUART"
365 Select this to enable a debug UART using the serial_leon3 driver. You
366 will need to provide parameters to make this work. The driver will
367 be available until the real driver model serial is running.
369 config DEBUG_UART_PL010
371 depends on PL01X_SERIAL
373 Select this to enable a debug UART using the pl01x driver with the
374 PL010 UART type. You will need to provide parameters to make this
375 work. The driver will be available until the real driver model
378 config DEBUG_UART_PL011
380 depends on PL01X_SERIAL || PL011_SERIAL
382 Select this to enable a debug UART using the pl01x driver with the
383 PL011 UART type. You will need to provide parameters to make this
384 work. The driver will be available until the real driver model
387 config DEBUG_UART_PIC32
388 bool "Microchip PIC32"
389 depends on PIC32_SERIAL
391 Select this to enable a debug UART using the serial_pic32 driver. You
392 will need to provide parameters to make this work. The driver will
393 be available until the real driver model serial is running.
395 config DEBUG_UART_MXC
396 bool "IMX Serial port"
399 Select this to enable a debug UART using the serial_mxc driver. You
400 will need to provide parameters to make this work. The driver will
401 be available until the real driver model serial is running.
403 config DEBUG_UART_SANDBOX
405 depends on SANDBOX_SERIAL
407 Select this to enable the debug UART using the sandbox driver. This
408 provides basic serial output from the console without needing to
409 start up driver model. The driver will be available until the real
410 driver model serial is running.
412 config DEBUG_UART_SEMIHOSTING
414 depends on SEMIHOSTING_SERIAL
416 Select this to enable the debug UART using the semihosting driver.
417 This provides basic serial output from the console without needing to
418 start up driver model. The driver will be available until the real
419 driver model serial is running.
421 config DEBUG_UART_SCIF
422 bool "Renesas SCIF UART"
423 depends on SH || ARCH_RMOBILE
425 Select this to enable a debug UART using the serial_sh driver. You
426 will need to provide parameters to make this work. The driver will
427 be available until the real driver-model serial is running.
429 config DEBUG_UART_SIFIVE
431 depends on SIFIVE_SERIAL
433 Select this to enable a debug UART using the serial_sifive driver. You
434 will need to provide parameters to make this work. The driver will
435 be available until the real driver-model serial is running.
437 config DEBUG_UART_STM32
438 bool "STMicroelectronics STM32"
439 depends on STM32_SERIAL
441 Select this to enable a debug UART using the serial_stm32 driver
442 You will need to provide parameters to make this work.
443 The driver will be available until the real driver model
446 config DEBUG_UART_UNIPHIER
447 bool "UniPhier on-chip UART"
448 depends on ARCH_UNIPHIER
450 Select this to enable a debug UART using the UniPhier on-chip UART.
451 You will need to provide DEBUG_UART_BASE to make this work. The
452 driver will be available until the real driver-model serial is
455 config DEBUG_UART_OMAP
457 depends on OMAP_SERIAL
459 Select this to enable a debug UART using the omap ns16550 driver.
460 You will need to provide parameters to make this work. The driver
461 will be available until the real driver model serial is running.
463 config DEBUG_UART_MTK
464 bool "MediaTek High-speed UART"
465 depends on MTK_SERIAL
467 Select this to enable a debug UART using the MediaTek High-speed
469 You will need to provide parameters to make this work. The
470 driver will be available until the real driver model serial is
473 config DEBUG_UART_MT7620
474 bool "UART driver for MediaTek MT7620 and earlier SoCs"
475 depends on MT7620_SERIAL
477 Select this to enable a debug UART using the UART driver for
478 MediaTek MT7620 and earlier SoCs.
479 You will need to provide parameters to make this work. The
480 driver will be available until the real driver model serial is
485 config DEBUG_UART_BASE
486 hex "Base address of UART"
487 depends on DEBUG_UART
488 default 0 if DEBUG_SBI_CONSOLE
489 default 0 if DEBUG_UART_SANDBOX
490 default 0xff000000 if DEBUG_UART_ZYNQ && ARCH_ZYNQMP
491 default 0xe0000000 if DEBUG_UART_ZYNQ && ARCH_ZYNQ
493 This is the base address of your UART for memory-mapped UARTs.
495 A default should be provided by your board, but if not you will need
496 to use the correct value here.
498 config SPL_DEBUG_UART_BASE
499 hex "Base address of UART for SPL"
500 depends on SPL && DEBUG_UART
501 default DEBUG_UART_BASE
503 This is the base address of your UART for memory-mapped UARTs for SPL.
505 config TPL_DEBUG_UART_BASE
506 hex "Base address of UART for TPL"
507 depends on TPL && DEBUG_UART
508 default DEBUG_UART_BASE
510 This is the base address of your UART for memory-mapped UARTs for TPL.
512 config DEBUG_UART_CLOCK
513 int "UART input clock"
514 depends on DEBUG_UART
515 default 0 if DEBUG_SBI_CONSOLE
516 default 0 if DEBUG_UART_SANDBOX
517 default 0 if DEBUG_MVEBU_A3700_UART
518 default 100000000 if DEBUG_UART_ZYNQ && ARCH_ZYNQMP
519 default 50000000 if DEBUG_UART_ZYNQ && ARCH_ZYNQ
521 The UART input clock determines the speed of the internal UART
522 circuitry. The baud rate is derived from this by dividing the input
525 A default should be provided by your board, but if not you will need
526 to use the correct value here.
528 config DEBUG_UART_SHIFT
529 int "UART register shift"
530 depends on DEBUG_UART
531 default 0 if DEBUG_UART
533 Some UARTs (notably ns16550) support different register layouts
534 where the registers are spaced either as bytes, words or some other
535 value. Use this value to specify the shift to use, where 0=byte
536 registers, 2=32-bit word registers, etc.
538 config DEBUG_UART_BOARD_INIT
539 bool "Enable board-specific debug UART init"
540 depends on DEBUG_UART
542 Some boards need to set things up before the debug UART can be used.
543 On these boards a call to debug_uart_init() is insufficient. When
544 this option is enabled, the function board_debug_uart_init() will
545 be called when debug_uart_init() is called. You can put any code
546 here that is needed to set up the UART ready for use, such as set
547 pin multiplexing or enable clocks.
549 config DEBUG_UART_ANNOUNCE
550 bool "Show a message when the debug UART starts up"
551 depends on DEBUG_UART
553 Enable this option to show a message when the debug UART is ready
554 for use. You will see a message like "<debug_uart> " as soon as
555 U-Boot has the UART ready for use (i.e. your code calls
556 debug_uart_init()). This can be useful just as a check that
557 everything is working.
559 config DEBUG_UART_SKIP_INIT
560 bool "Skip UART initialization"
561 depends on DEBUG_UART
563 Select this if the UART you want to use for debug output is already
564 initialized by the time U-Boot starts its execution.
566 config DEBUG_UART_NS16550_CHECK_ENABLED
567 bool "Check if UART is enabled on output"
568 depends on DEBUG_UART
569 depends on DEBUG_UART_NS16550
571 Select this if puts()/putc() might be called before the debug UART
572 has been initialized. If this is disabled, putc() might sit in a
573 tight loop if it is called before debug_uart_init() has been called.
575 Note that this does not work for every ns16550-compatible UART and
576 so has to be enabled carefully or you might notice lost characters.
578 config ALTERA_JTAG_UART
579 bool "Altera JTAG UART support"
582 Select this to enable an JTAG UART for Altera devices.The JTAG UART
583 core implements a method to communicate serial character streams
584 between a host PC and a Qsys system on an Altera FPGA. Please find
585 details on the "Embedded Peripherals IP User Guide" of Altera.
587 config ALTERA_JTAG_UART_BYPASS
588 bool "Bypass output when no connection"
589 depends on ALTERA_JTAG_UART
591 Bypass console output and keep going even if there is no JTAG
592 terminal connection with the host. The console output will resume
593 once the JTAG terminal is connected. Without the bypass, the console
594 output will wait forever until a JTAG terminal is connected. If you
598 bool "Altera UART support"
601 Select this to enable an UART for Altera devices. Please find
602 details on the "Embedded Peripherals IP User Guide" of Altera.
605 bool "QCA/Atheros ar933x UART support"
606 depends on DM_SERIAL && SOC_AR933X
608 Select this to enable UART support for QCA/Atheros ar933x
609 devices. This driver uses driver model and requires a device
610 tree binding to operate, please refer to the document at
611 doc/device-tree-bindings/serial/qca,ar9330-uart.txt.
614 bool "ARC UART support"
617 Select this to enable support for ARC UART now typically
618 only used in Synopsys DesignWare ARC simulators like nSIM.
621 bool "ARM Debug Communication Channel (DCC) as UART support"
624 Select this to enable using the ARM DCC as a form of UART.
627 bool "Atmel USART support"
629 Select this to enable USART support for Atmel SoCs. It can be
630 configured in the device tree, and input clock frequency can
631 be got from the clk node.
633 config SPL_UART_CLOCK
634 int "SPL fixed UART input clock"
635 depends on ATMEL_USART && SPL && !SPL_CLK
636 default 132096000 if ARCH_AT91
638 Provide a fixed clock value as input to the UART controller. This
639 might be needed on platforms which can't enable CONFIG_SPL_CLK
640 because of SPL image size restrictions.
642 config BCM283X_MU_SERIAL
643 bool "Support for BCM283x Mini-UART"
644 depends on DM_SERIAL && ARCH_BCM283X
647 Select this to enable Mini-UART support on BCM283X family of SoCs.
649 config BCM283X_PL011_SERIAL
650 bool "Support for BCM283x PL011 UART"
651 depends on PL01X_SERIAL && ARCH_BCM283X
654 Select this to enable an overriding PL011 driver for BCM283X SoCs
655 that supports automatic disable, so that it only gets used when
656 the UART is actually muxed.
658 config BCM6345_SERIAL
659 bool "Support for BCM6345 UART"
662 Select this to enable UART on BCM6345 SoCs.
664 config COREBOOT_SERIAL
665 bool "Coreboot UART support"
667 default y if SYS_COREBOOT
670 Select this to enable a ns16550-style UART where the platform data
671 comes from the coreboot 'sysinfo' tables. This allows U-Boot to have
672 a serial console on any platform without needing to change the
675 config COREBOOT_SERIAL_FROM_DBG2
676 bool "Obtain UART from ACPI tables"
677 depends on COREBOOT_SERIAL
680 Select this to try to find a DBG2 record in the ACPI tables, in the
681 event that coreboot does not provide information about the UART in the
682 normal sysinfo tables. This provides a useful fallback when serial
683 is not enabled in coreboot.
686 bool "Cortina UART support"
689 Select this to enable UART support for Cortina-Access UART devices
690 found on CAxxxx SoCs.
692 config FSL_LINFLEXUART
693 bool "Freescale Linflex UART support"
696 Select this to enable the Linflex serial module found on some
697 NXP SoCs like S32V234.
700 bool "Freescale LPUART support"
702 Select this to enable a Low Power UART for Freescale VF610 and
703 QorIQ Layerscape devices.
706 bool "Use the LPUART as console"
707 depends on FSL_LPUART
709 config MVEBU_A3700_UART
710 bool "UART support for Armada 3700"
712 Choose this option to add support for UART driver on the Marvell
713 Armada 3700 SoC. The base address is configured via DT.
716 bool "Freescale ColdFire UART support"
718 Choose this option to add support for UART driver on the ColdFire
719 SoC's family. The serial communication channel provides a full-duplex
720 asynchronous/synchronous receiver and transmitter deriving an
721 operating frequency from the internal bus clock or an external clock.
724 bool "IMX serial port support"
725 depends on ARCH_MX31 || MX5 || MX6 || MX7 || IMX8M
727 If you have a machine based on a Motorola IMX CPU you
728 can enable its onboard serial port by enabling this option.
730 config NULLDEV_SERIAL
731 bool "Null serial device"
733 Select this to enable null serial device support. A null serial
734 device merely acts as a placeholder for a serial device and does
735 nothing for all it's operation.
738 bool "Support for Microchip PIC32 on-chip UART"
739 depends on DM_SERIAL && MACH_PIC32
742 Support for the UART found on Microchip PIC32 SoC's.
744 config SYS_NS16550_SERIAL
745 bool "NS16550 UART or compatible legacy driver"
746 depends on !DM_SERIAL
749 config SPL_SYS_NS16550_SERIAL
750 bool "NS16550 UART or compatible legacy driver in SPL"
751 depends on SPL && !SPL_DM_SERIAL
752 default y if SYS_NS16550_SERIAL || ARCH_SUNXI || ARCH_OMAP2PLUS
756 bool "NS16550 UART or compatible"
758 Support NS16550 UART or compatible. This can be enabled in the
759 device tree with the correct input clock frequency. If the input
760 clock frequency is not defined in the device tree, the macro
761 CFG_SYS_NS16550_CLK defined in a legacy board header file will
762 be used. It can be a constant or a function to get clock, eg,
765 config NS16550_DYNAMIC
766 bool "Allow NS16550 to be configured at runtime"
767 depends on SYS_NS16550
768 default y if SYS_COREBOOT || SYS_SLIMBOOTLOADER
770 Enable this option to allow device-tree control of the driver.
772 Normally this driver is controlled by the following options:
774 It is not a good practice for a driver to be statically configured,
775 since it prevents the same driver being used for different types of
776 UARTs in a system. This option avoids this problem at the cost of a
777 slightly increased code size.
779 config SYS_NS16550_MEM32
780 bool "If memory-mapped, 32bit access is needed for ns16550 register access"
781 depends on SYS_NS16550
783 If enabled, if memory-mapped, indicates that 32-bit access should be
784 used (instead of 8-bit) for register access.
786 config SYS_NS16550_PORT_MAPPED
787 bool "Port I/O is used for ns16550 register access"
788 depends on SYS_NS16550
790 If enabled, port I/O is used for ns16550 register access. If not
791 enabled, then the UART is memory-mapped.
793 config SYS_NS16550_REG_SIZE
794 int "ns16550 register width and endianness"
795 depends on SYS_NS16550_SERIAL || SPL_SYS_NS16550_SERIAL
797 default -4 if ARCH_OMAP2PLUS || ARCH_SUNXI
800 Indicates register width and also endianness. If positive, big-endian
801 access is used. If negative, little-endian is used.
803 config SPL_NS16550_MIN_FUNCTIONS
804 bool "Only provide NS16550_init and NS16550_putc in SPL"
805 depends on SPL_SYS_NS16550_SERIAL && PPC
807 Enable this if you desire to only have use of the NS16550_init and
808 NS16550_putc functions for the serial driver located at
809 drivers/serial/ns16550.c. This option is useful for saving space for
810 already greatly restricted images, including but not limited to
811 NAND_SPL configurations.
813 config INTEL_MID_SERIAL
814 bool "Intel MID platform UART support"
815 depends on DM_SERIAL && OF_CONTROL
819 Select this to enable a UART for Intel MID platforms.
820 This uses the ns16550 driver as a library.
823 bool "ARM PL011 driver"
824 depends on !DM_SERIAL
826 Select this to enable a UART for platforms using PL011.
829 bool "ARM PL010 and PL011 driver"
832 Select this to enable a UART for platforms using PL010 or PL011.
834 config ROCKCHIP_SERIAL
835 bool "Rockchip on-chip UART support"
839 Select this to enable a debug UART for Rockchip devices when using
840 OF_PLATDATA (i.e. a compiled-in device tree replacemenmt).
841 This uses the ns16550 driver, converting the platdata from of-platdata
842 to the ns16550 format.
845 bool "Support for Samsung S5P UART"
846 depends on ARCH_APPLE || ARCH_EXYNOS || ARCH_S5PC1XX
849 Select this to enable Samsung S5P UART support.
851 config S5P4418_PL011_SERIAL
852 bool "Extended PL011 driver for S5P4418"
853 depends on DM_SERIAL && PL01X_SERIAL && ARCH_NEXELL
856 Select this to enable support of the PL011 UARTs in the S5P4418 SOC.
857 With this driver the UART-clocks are set to the appropriate rate
858 (if not 'skip-init').
860 config SANDBOX_SERIAL
861 bool "Sandbox UART support"
865 Select this to enable a seral UART for sandbox. This is required to
866 operate correctly, otherwise you will see no serial output from
867 sandbox. The emulated UART will display to the console and console
868 input will be fed into the UART. This allows you to interact with
871 The operation of the console is controlled by the -t command-line
872 flag. In raw mode, U-Boot sees all characters from the terminal
873 before they are processed, including Ctrl-C. In cooked mode, Ctrl-C
874 is processed by the terminal, and terminates U-Boot. Valid options
877 -t raw-with-sigs Raw mode, Ctrl-C will terminate U-Boot
878 -t raw Raw mode, Ctrl-C is processed by U-Boot
879 -t cooked Cooked mode, Ctrl-C terminates
882 bool "Renesas SCIF UART support"
883 depends on SH || ARCH_RMOBILE
885 Select this to enable Renesas SCIF UART. To operate serial ports
886 on systems with RCar or SH SoCs, say Y to this option. If unsure,
890 prompt "SCIF console port"
891 depends on SCIF_CONSOLE && (!DM_SERIAL || (SPL && !SPL_DM_SERIAL))
910 config SH_SCIF_CLK_FREQ
911 int "SCIF console clock frequency"
912 depends on SCIF_CONSOLE && (!DM_SERIAL || (SPL && !SPL_DM_SERIAL))
915 config SEMIHOSTING_SERIAL
916 bool "Semihosting UART support"
917 depends on SEMIHOSTING && !SERIAL_RX_BUFFER
920 Select this to enable a serial UART using semihosting. Special halt
921 instructions will be issued which an external debugger (such as a
922 JTAG emulator) may interpret. The debugger will display U-Boot's
923 console output on the host system.
925 Enable this option only if you are using a debugger which supports
926 semihosting. If you are not using a debugger, this driver will halt
929 config UNIPHIER_SERIAL
930 bool "Support for UniPhier on-chip UART"
931 depends on ARCH_UNIPHIER
934 If you have a UniPhier based board and want to use the on-chip
935 serial ports, say Y to this option. If unsure, say N.
937 config XILINX_UARTLITE
938 bool "Xilinx Uarlite support"
941 If you have a Xilinx based board and want to use the uartlite
942 serial ports, say Y to this option. If unsure, say N.
945 bool "Support for Amlogic Meson UART"
946 depends on DM_SERIAL && ARCH_MESON
948 If you have an Amlogic Meson based board and want to use the on-chip
949 serial ports, say Y to this option. If unsure, say N.
952 bool "Qualcomm on-chip UART"
955 Support Data Mover UART used on Qualcomm Snapdragon SoCs.
956 It should support all Qualcomm devices with UARTDM version 1.4,
957 for example APQ8016 and MSM8916.
958 Single baudrate is supported in current implementation (115200).
960 config MSM_GENI_SERIAL
961 bool "Qualcomm on-chip GENI UART"
965 Support UART based on Generic Interface (GENI) Serial Engine (SE),
966 used on Qualcomm Snapdragon SoCs. Should support all qualcomm SOCs
967 with Qualcomm Universal Peripheral (QUP) Wrapper cores,
968 i.e. newer ones, starting from SDM845.
969 Driver works in FIFO mode.
970 Multiple baudrates supported.
972 config MXS_AUART_SERIAL
976 Support for Freescale i.MX23 / i.MX28 AUART or Application UART IP.
977 This IP is present in the aforementioned SoCs, however this is not
978 the IP used to drive the Debug UART port, for that see PL01X_SERIAL .
980 config OCTEON_SERIAL_BOOTCMD
981 bool "MIPS Octeon PCI remote bootcmd input"
982 depends on ARCH_OCTEON
987 This driver supports remote input over the PCIe bus from a host
988 to U-Boot for entering commands. It is utilized by the host
989 commands 'oct-remote-load' and 'oct-remote-bootcmd'.
991 config OCTEON_SERIAL_PCIE_CONSOLE
992 bool "MIPS Octeon PCIe remote console"
993 depends on ARCH_OCTEON
994 depends on (DM_SERIAL && DM_STDIO)
995 select SYS_STDIO_DEREGISTER
996 select SYS_CONSOLE_IS_IN_ENV
999 This driver supports remote console over the PCIe bus when the
1000 Octeon is running in PCIe target mode. The host program
1001 'oct-remote-console' can be used to connect to this console.
1002 The console number will likely be 0 or 1.
1005 bool "Support for OMAP specific UART"
1006 depends on DM_SERIAL
1007 default y if (ARCH_OMAP2PLUS || ARCH_K3)
1010 If you have an TI based SoC and want to use the on-chip serial
1011 port, say Y to this option. If unsure say N.
1014 bool "Actions Semi OWL UART"
1015 depends on DM_SERIAL && ARCH_OWL
1017 If you have a Actions Semi OWL based board and want to use the on-chip
1018 serial port, say Y to this option. If unsure, say N.
1019 Single baudrate is supported in current implementation (115200).
1022 bool "RISC-V HTIF console support"
1023 depends on DM_SERIAL && 64BIT
1025 Select this to enable host transfer interface (HTIF) based serial
1026 console. The HTIF device is quite common in RISC-V emulators and
1027 RISC-V ISS so this driver allows using U-Boot on such platforms.
1029 config SIFIVE_SERIAL
1030 bool "SiFive UART support"
1031 depends on DM_SERIAL
1033 This driver supports the SiFive UART. If unsure say N.
1035 config STI_ASC_SERIAL
1036 bool "STMicroelectronics on-chip UART"
1037 depends on DM_SERIAL && ARCH_STI
1039 Select this to enable Asynchronous Serial Controller available
1040 on STiH410 SoC. This is a basic implementation, it supports
1041 following baudrate 9600, 19200, 38400, 57600 and 115200.
1044 bool "STMicroelectronics STM32 SoCs on-chip UART"
1045 depends on DM_SERIAL && (STM32F4 || STM32F7 || STM32H7 || ARCH_STM32MP)
1047 If you have a machine based on a STM32 F4, F7, H7 or MP1 SOC
1048 you can enable its onboard serial ports, say Y to this option.
1052 bool "Cadence (Xilinx Zynq) UART support"
1053 depends on DM_SERIAL
1055 This driver supports the Cadence UART. It is found e.g. in Xilinx
1059 bool "MediaTek High-speed UART support"
1060 depends on DM_SERIAL
1062 Select this to enable UART support for MediaTek High-speed UART
1063 devices. This driver uses driver model and requires a device
1064 tree binding to operate.
1065 The High-speed UART is compatible with the ns16550a UART and have
1066 its own high-speed registers.
1068 config MT7620_SERIAL
1069 bool "UART driver for MediaTek MT7620 and earlier SoCs"
1070 depends on DM_SERIAL
1072 Select this to enable UART support for MediaTek MT7620 and earlier
1073 SoCs. This driver uses driver model and requires a device tree
1075 The UART driver for MediaTek MT7620 and earlier SoCs is *NOT*
1076 compatible with the ns16550a UART.
1079 bool "Console driver for MPC8XX"
1084 bool "Nuvoton NPCM UART driver"
1085 depends on DM_SERIAL
1087 Select this to enable UART support for Nuvoton BMCs
1088 (NPCM7xx and NPCM8xx).
1089 The driver enables the onboard serial port with 8-N-1
1093 bool "XEN serial support"
1096 If built without DM support, then requires Xen
1097 to be built with CONFIG_VERBOSE_DEBUG.
1100 prompt "Console port"
1101 default 8xx_CONS_SMC1
1102 depends on MPC8XX_CONS
1104 Depending on board, select one serial port
1105 (CONFIG_8xx_CONS_SMC1 or CONFIG_8xx_CONS_SMC2)
1107 config 8xx_CONS_SMC1
1110 config 8xx_CONS_SMC2
1115 config SYS_SMC_RXBUFLEN
1116 int "Console Rx buffer length"
1117 depends on MPC8XX_CONS
1120 With CONFIG_SYS_SMC_RXBUFLEN it is possible to define
1121 the maximum receive buffer length for the SMC.
1122 This option is actual only for 8xx possible.
1123 If using CONFIG_SYS_SMC_RXBUFLEN also CONFIG_SYS_MAXIDLE
1124 must be defined, to setup the maximum idle timeout for
1128 int "maximum idle timeout"
1129 depends on MPC8XX_CONS
1132 config SYS_BRGCLK_PRESCALE
1133 int "BRG Clock Prescale"
1134 depends on MPC8XX_CONS
1139 depends on MPC8XX_CONS
1144 depends on MPC8XX_CONS