3 source "lib/Kconfig.debug"
6 bool "Export kernel pagetable layout to userspace via debugfs"
7 depends on DEBUG_KERNEL
10 Say Y here if you want to show the kernel pagetable layout in a
11 debugfs file. This information is only useful for kernel developers
12 who are working in architecture specific areas of the kernel.
13 It is probably not a good idea to enable this feature in a production
18 bool "Filter access to /dev/mem"
21 If this option is disabled, you allow userspace (root) access to all
22 of memory, including kernel and userspace memory. Accidental
23 access to this is obviously disastrous, but specific access can
24 be used by people debugging the kernel.
26 If this option is switched on, the /dev/mem file only allows
27 userspace access to memory mapped peripherals.
31 # RMK wants arm kernels compiled with frame pointers or stack unwinding.
32 # If you know what you are doing and are willing to live without stack
33 # traces, you can get a slightly smaller kernel by setting this option to
34 # n, but then RMK will have to kill you ;).
37 depends on !THUMB2_KERNEL
38 default y if !ARM_UNWIND || FUNCTION_GRAPH_TRACER
40 If you say N here, the resulting kernel will be slightly smaller and
41 faster. However, if neither FRAME_POINTER nor ARM_UNWIND are enabled,
42 when a problem occurs with the kernel, the information that is
43 reported is severely limited.
46 bool "Enable stack unwinding support (EXPERIMENTAL)"
50 This option enables stack unwinding support in the kernel
51 using the information automatically generated by the
52 compiler. The resulting kernel image is slightly bigger but
53 the performance is not affected. Currently, this feature
54 only works with EABI compilers. If unsure say Y.
58 depends on FUNCTION_TRACER && FRAME_POINTER
62 bool "Verbose user fault messages"
64 When a user program crashes due to an exception, the kernel can
65 print a brief message explaining what the problem was. This is
66 sometimes helpful for debugging but serves no purpose on a
67 production system. Most people should say N here.
69 In addition, you need to pass user_debug=N on the kernel command
70 line to enable this feature. N consists of the sum of:
72 1 - undefined instruction events
74 4 - invalid data aborts
78 # These options are only for real kernel hackers who want to get their hands dirty.
80 bool "Kernel low-level debugging functions (read help!)"
81 depends on DEBUG_KERNEL
83 Say Y here to include definitions of printascii, printch, printhex
84 in the kernel. This is helpful if you are debugging code that
85 executes before the console is initialized.
87 Note that selecting this option will limit the kernel to a single
88 UART definition, as specified below. Attempting to boot the kernel
89 image on a different platform *will not work*, so this option should
90 not be enabled for kernels that are intended to be portable.
93 prompt "Kernel low-level debugging port"
96 config AT91_DEBUG_LL_DBGU0
97 bool "Kernel low-level debugging on rm9200, 9260/9g20, 9261/9g10 and 9rl"
98 depends on HAVE_AT91_DBGU0
100 config AT91_DEBUG_LL_DBGU1
101 bool "Kernel low-level debugging on 9263 and 9g45"
102 depends on HAVE_AT91_DBGU1
105 bool "Kernel low-level debugging on BCM2835 PL011 UART"
106 depends on ARCH_BCM2835
107 select DEBUG_UART_PL01X
109 config DEBUG_BCM_5301X
110 bool "Kernel low-level debugging on BCM5301X UART1"
111 depends on ARCH_BCM_5301X
112 select DEBUG_UART_PL01X
114 config DEBUG_BCM_KONA_UART
115 bool "Kernel low-level debugging messages via BCM KONA UART"
116 depends on ARCH_BCM_MOBILE
117 select DEBUG_UART_8250
119 Say Y here if you want kernel low-level debugging support
120 on Broadcom SoC platforms.
121 This low level debug works for Broadcom
122 mobile SoCs in the Kona family of chips (e.g. bcm28155,
125 config DEBUG_BERLIN_UART
126 bool "Marvell Berlin SoC Debug UART"
127 depends on ARCH_BERLIN
128 select DEBUG_UART_8250
130 Say Y here if you want kernel low-level debugging support
131 on Marvell Berlin SoC based platforms.
133 config DEBUG_CLPS711X_UART1
134 bool "Kernel low-level debugging messages via UART1"
135 depends on ARCH_CLPS711X
137 Say Y here if you want the debug print routines to direct
138 their output to the first serial port on these devices.
140 config DEBUG_CLPS711X_UART2
141 bool "Kernel low-level debugging messages via UART2"
142 depends on ARCH_CLPS711X
144 Say Y here if you want the debug print routines to direct
145 their output to the second serial port on these devices.
148 bool "Kernel Kernel low-level debugging on Cavium Networks CNS3xxx"
149 depends on ARCH_CNS3XXX
150 select DEBUG_UART_PL01X
152 Say Y here if you want the debug print routines to direct
153 their output to the CNS3xxx UART0.
155 config DEBUG_DAVINCI_DA8XX_UART1
156 bool "Kernel low-level debugging on DaVinci DA8XX using UART1"
157 depends on ARCH_DAVINCI_DA8XX
158 select DEBUG_UART_8250
160 Say Y here if you want the debug print routines to direct
161 their output to UART1 serial port on DaVinci DA8XX devices.
163 config DEBUG_DAVINCI_DA8XX_UART2
164 bool "Kernel low-level debugging on DaVinci DA8XX using UART2"
165 depends on ARCH_DAVINCI_DA8XX
166 select DEBUG_UART_8250
168 Say Y here if you want the debug print routines to direct
169 their output to UART2 serial port on DaVinci DA8XX devices.
171 config DEBUG_DAVINCI_DMx_UART0
172 bool "Kernel low-level debugging on DaVinci DMx using UART0"
173 depends on ARCH_DAVINCI_DMx
174 select DEBUG_UART_8250
176 Say Y here if you want the debug print routines to direct
177 their output to UART0 serial port on DaVinci DMx devices.
179 config DEBUG_ZYNQ_UART0
180 bool "Kernel low-level debugging on Xilinx Zynq using UART0"
183 Say Y here if you want the debug print routines to direct
184 their output to UART0 on the Zynq platform.
186 config DEBUG_ZYNQ_UART1
187 bool "Kernel low-level debugging on Xilinx Zynq using UART1"
190 Say Y here if you want the debug print routines to direct
191 their output to UART1 on the Zynq platform.
193 If you have a ZC702 board and want early boot messages to
194 appear on the USB serial adaptor, select this option.
196 config DEBUG_DC21285_PORT
197 bool "Kernel low-level debugging messages via footbridge serial port"
198 depends on FOOTBRIDGE
200 Say Y here if you want the debug print routines to direct
201 their output to the serial port in the DC21285 (Footbridge).
203 config DEBUG_FOOTBRIDGE_COM1
204 bool "Kernel low-level debugging messages via footbridge 8250 at PCI COM1"
205 depends on FOOTBRIDGE
207 Say Y here if you want the debug print routines to direct
208 their output to the 8250 at PCI COM1.
210 config DEBUG_HI3620_UART
211 bool "Hisilicon HI3620 Debug UART"
212 depends on ARCH_HI3xxx
213 select DEBUG_UART_PL01X
215 Say Y here if you want kernel low-level debugging support
218 config DEBUG_HI3716_UART
219 bool "Hisilicon Hi3716 Debug UART"
220 depends on ARCH_HI3xxx
221 select DEBUG_UART_PL01X
223 Say Y here if you want kernel low-level debugging support
226 config DEBUG_HIGHBANK_UART
227 bool "Kernel low-level debugging messages via Highbank UART"
228 depends on ARCH_HIGHBANK
229 select DEBUG_UART_PL01X
231 Say Y here if you want the debug print routines to direct
232 their output to the UART on Highbank based devices.
234 config DEBUG_IMX1_UART
235 bool "i.MX1 Debug UART"
238 Say Y here if you want kernel low-level debugging support
241 config DEBUG_IMX23_UART
242 bool "i.MX23 Debug UART"
244 select DEBUG_UART_PL01X
246 Say Y here if you want kernel low-level debugging support
249 config DEBUG_IMX25_UART
250 bool "i.MX25 Debug UART"
253 Say Y here if you want kernel low-level debugging support
256 config DEBUG_IMX21_IMX27_UART
257 bool "i.MX21 and i.MX27 Debug UART"
258 depends on SOC_IMX21 || SOC_IMX27
260 Say Y here if you want kernel low-level debugging support
263 config DEBUG_IMX28_UART
264 bool "i.MX28 Debug UART"
266 select DEBUG_UART_PL01X
268 Say Y here if you want kernel low-level debugging support
271 config DEBUG_IMX31_UART
272 bool "i.MX31 Debug UART"
275 Say Y here if you want kernel low-level debugging support
278 config DEBUG_IMX35_UART
279 bool "i.MX35 Debug UART"
282 Say Y here if you want kernel low-level debugging support
285 config DEBUG_IMX50_UART
286 bool "i.MX50 Debug UART"
289 Say Y here if you want kernel low-level debugging support
292 config DEBUG_IMX51_UART
293 bool "i.MX51 Debug UART"
296 Say Y here if you want kernel low-level debugging support
299 config DEBUG_IMX53_UART
300 bool "i.MX53 Debug UART"
303 Say Y here if you want kernel low-level debugging support
306 config DEBUG_IMX6Q_UART
307 bool "i.MX6Q/DL Debug UART"
310 Say Y here if you want kernel low-level debugging support
313 config DEBUG_IMX6SL_UART
314 bool "i.MX6SL Debug UART"
315 depends on SOC_IMX6SL
317 Say Y here if you want kernel low-level debugging support
320 config DEBUG_IMX6SX_UART
321 bool "i.MX6SX Debug UART"
322 depends on SOC_IMX6SX
324 Say Y here if you want kernel low-level debugging support
327 config DEBUG_KEYSTONE_UART0
328 bool "Kernel low-level debugging on KEYSTONE2 using UART0"
329 depends on ARCH_KEYSTONE
330 select DEBUG_UART_8250
332 Say Y here if you want the debug print routines to direct
333 their output to UART0 serial port on KEYSTONE2 devices.
335 config DEBUG_KEYSTONE_UART1
336 bool "Kernel low-level debugging on KEYSTONE2 using UART1"
337 depends on ARCH_KEYSTONE
338 select DEBUG_UART_8250
340 Say Y here if you want the debug print routines to direct
341 their output to UART1 serial port on KEYSTONE2 devices.
343 config DEBUG_MMP_UART2
344 bool "Kernel low-level debugging message via MMP UART2"
346 select DEBUG_UART_8250
348 Say Y here if you want kernel low-level debugging support
351 config DEBUG_MMP_UART3
352 bool "Kernel low-level debugging message via MMP UART3"
354 select DEBUG_UART_8250
356 Say Y here if you want kernel low-level debugging support
359 config DEBUG_MSM_UART
360 bool "Kernel low-level debugging messages via MSM UART"
363 Say Y here if you want the debug print routines to direct
364 their output to the serial port on MSM devices.
366 ARCH DEBUG_UART_PHYS DEBUG_UART_BASE #
367 MSM7X00A, QSD8X50 0xa9a00000 0xe1000000 UART1
368 MSM7X00A, QSD8X50 0xa9b00000 0xe1000000 UART2
369 MSM7X00A, QSD8X50 0xa9c00000 0xe1000000 UART3
371 MSM7X30 0xaca00000 0xe1000000 UART1
372 MSM7X30 0xacb00000 0xe1000000 UART2
373 MSM7X30 0xacc00000 0xe1000000 UART3
375 Please adjust DEBUG_UART_PHYS and DEBUG_UART_BASE configuration
376 options based on your needs.
378 config DEBUG_QCOM_UARTDM
379 bool "Kernel low-level debugging messages via QCOM UARTDM"
382 Say Y here if you want the debug print routines to direct
383 their output to the serial port on Qualcomm devices.
385 ARCH DEBUG_UART_PHYS DEBUG_UART_BASE
386 MSM8X60 0x19c40000 0xf0040000
387 MSM8960 0x16440000 0xf0040000
388 MSM8974 0xf991e000 0xfa71e000
390 Please adjust DEBUG_UART_PHYS and DEBUG_UART_BASE configuration
391 options based on your needs.
393 config DEBUG_MVEBU_UART
394 bool "Kernel low-level debugging messages via MVEBU UART (old bootloaders)"
395 depends on ARCH_MVEBU
396 select DEBUG_UART_8250
398 Say Y here if you want kernel low-level debugging support
399 on MVEBU based platforms.
401 This option should be used with the old bootloaders
402 that left the internal registers mapped at
403 0xd0000000. As of today, this is the case on
404 platforms such as the Globalscale Mirabox or the
405 Plathome OpenBlocks AX3, when using the original
408 If the wrong DEBUG_MVEBU_UART* option is selected,
409 when u-boot hands over to the kernel, the system
410 silently crashes, with no serial output at all.
412 config DEBUG_MVEBU_UART_ALTERNATE
413 bool "Kernel low-level debugging messages via MVEBU UART (new bootloaders)"
414 depends on ARCH_MVEBU
415 select DEBUG_UART_8250
417 Say Y here if you want kernel low-level debugging support
418 on MVEBU based platforms.
420 This option should be used with the new bootloaders
421 that remap the internal registers at 0xf1000000.
423 If the wrong DEBUG_MVEBU_UART* option is selected,
424 when u-boot hands over to the kernel, the system
425 silently crashes, with no serial output at all.
431 Say Y here if you want kernel low-level debugging support
432 on Vybrid based platforms.
434 config DEBUG_NOMADIK_UART
435 bool "Kernel low-level debugging messages via NOMADIK UART"
436 depends on ARCH_NOMADIK
437 select DEBUG_UART_PL01X
439 Say Y here if you want kernel low-level debugging support
440 on NOMADIK based platforms.
442 config DEBUG_NSPIRE_CLASSIC_UART
443 bool "Kernel low-level debugging via TI-NSPIRE 8250 UART"
444 depends on ARCH_NSPIRE
445 select DEBUG_UART_8250
447 Say Y here if you want kernel low-level debugging support
448 on TI-NSPIRE classic models.
450 config DEBUG_NSPIRE_CX_UART
451 bool "Kernel low-level debugging via TI-NSPIRE PL011 UART"
452 depends on ARCH_NSPIRE
453 select DEBUG_UART_PL01X
455 Say Y here if you want kernel low-level debugging support
456 on TI-NSPIRE CX models.
458 config DEBUG_OMAP2UART1
459 bool "OMAP2/3/4 UART1 (omap2/3 sdp boards and some omap3 boards)"
460 depends on ARCH_OMAP2PLUS
461 select DEBUG_OMAP2PLUS_UART
463 This covers at least h4, 2430sdp, 3430sdp, 3630sdp,
464 omap3 torpedo and 3530 lv som.
466 config DEBUG_OMAP2UART2
467 bool "Kernel low-level debugging messages via OMAP2/3/4 UART2"
468 depends on ARCH_OMAP2PLUS
469 select DEBUG_OMAP2PLUS_UART
471 config DEBUG_OMAP2UART3
472 bool "Kernel low-level debugging messages via OMAP2 UART3 (n8x0)"
473 depends on ARCH_OMAP2PLUS
474 select DEBUG_OMAP2PLUS_UART
476 config DEBUG_OMAP3UART3
477 bool "Kernel low-level debugging messages via OMAP3 UART3 (most omap3 boards)"
478 depends on ARCH_OMAP2PLUS
479 select DEBUG_OMAP2PLUS_UART
481 This covers at least cm_t3x, beagle, crane, devkit8000,
482 igep00x0, ldp, n900, n9(50), pandora, overo, touchbook,
485 config DEBUG_OMAP4UART3
486 bool "Kernel low-level debugging messages via OMAP4/5 UART3 (omap4 blaze, panda, omap5 sevm)"
487 depends on ARCH_OMAP2PLUS
488 select DEBUG_OMAP2PLUS_UART
490 config DEBUG_OMAP3UART4
491 bool "Kernel low-level debugging messages via OMAP36XX UART4"
492 depends on ARCH_OMAP2PLUS
493 select DEBUG_OMAP2PLUS_UART
495 config DEBUG_OMAP4UART4
496 bool "Kernel low-level debugging messages via OMAP4/5 UART4"
497 depends on ARCH_OMAP2PLUS
498 select DEBUG_OMAP2PLUS_UART
500 config DEBUG_TI81XXUART1
501 bool "Kernel low-level debugging messages via TI81XX UART1 (ti8148evm)"
502 depends on ARCH_OMAP2PLUS
503 select DEBUG_OMAP2PLUS_UART
505 config DEBUG_TI81XXUART2
506 bool "Kernel low-level debugging messages via TI81XX UART2"
507 depends on ARCH_OMAP2PLUS
508 select DEBUG_OMAP2PLUS_UART
510 config DEBUG_TI81XXUART3
511 bool "Kernel low-level debugging messages via TI81XX UART3 (ti8168evm)"
512 depends on ARCH_OMAP2PLUS
513 select DEBUG_OMAP2PLUS_UART
515 config DEBUG_AM33XXUART1
516 bool "Kernel low-level debugging messages via AM33XX UART1"
517 depends on ARCH_OMAP2PLUS
518 select DEBUG_OMAP2PLUS_UART
520 config DEBUG_ZOOM_UART
521 bool "Kernel low-level debugging messages via Zoom2/3 UART"
522 depends on ARCH_OMAP2PLUS
523 select DEBUG_OMAP2PLUS_UART
525 config DEBUG_PICOXCELL_UART
526 depends on ARCH_PICOXCELL
527 bool "Use PicoXcell UART for low-level debug"
528 select DEBUG_UART_8250
530 Say Y here if you want kernel low-level debugging support
531 on PicoXcell based platforms.
533 config DEBUG_PXA_UART1
535 bool "Use PXA UART1 for low-level debug"
536 select DEBUG_UART_8250
538 Say Y here if you want kernel low-level debugging support
541 config DEBUG_REALVIEW_STD_PORT
542 bool "RealView Default UART"
543 depends on ARCH_REALVIEW
544 select DEBUG_UART_PL01X
546 Say Y here if you want the debug print routines to direct
547 their output to the serial port on RealView EB, PB11MP, PBA8
550 config DEBUG_REALVIEW_PB1176_PORT
551 bool "RealView PB1176 UART"
552 depends on MACH_REALVIEW_PB1176
553 select DEBUG_UART_PL01X
555 Say Y here if you want the debug print routines to direct
556 their output to the standard serial port on the RealView
559 config DEBUG_RK29_UART0
560 bool "Kernel low-level debugging messages via Rockchip RK29 UART0"
561 depends on ARCH_ROCKCHIP
562 select DEBUG_UART_8250
564 Say Y here if you want kernel low-level debugging support
565 on Rockchip based platforms.
567 config DEBUG_RK29_UART1
568 bool "Kernel low-level debugging messages via Rockchip RK29 UART1"
569 depends on ARCH_ROCKCHIP
570 select DEBUG_UART_8250
572 Say Y here if you want kernel low-level debugging support
573 on Rockchip based platforms.
575 config DEBUG_RK29_UART2
576 bool "Kernel low-level debugging messages via Rockchip RK29 UART2"
577 depends on ARCH_ROCKCHIP
578 select DEBUG_UART_8250
580 Say Y here if you want kernel low-level debugging support
581 on Rockchip based platforms.
583 config DEBUG_RK3X_UART0
584 bool "Kernel low-level debugging messages via Rockchip RK3X UART0"
585 depends on ARCH_ROCKCHIP
586 select DEBUG_UART_8250
588 Say Y here if you want kernel low-level debugging support
589 on Rockchip based platforms.
591 config DEBUG_RK3X_UART1
592 bool "Kernel low-level debugging messages via Rockchip RK3X UART1"
593 depends on ARCH_ROCKCHIP
594 select DEBUG_UART_8250
596 Say Y here if you want kernel low-level debugging support
597 on Rockchip based platforms.
599 config DEBUG_RK3X_UART2
600 bool "Kernel low-level debugging messages via Rockchip RK3X UART2"
601 depends on ARCH_ROCKCHIP
602 select DEBUG_UART_8250
604 Say Y here if you want kernel low-level debugging support
605 on Rockchip based platforms.
607 config DEBUG_RK3X_UART3
608 bool "Kernel low-level debugging messages via Rockchip RK3X UART3"
609 depends on ARCH_ROCKCHIP
610 select DEBUG_UART_8250
612 Say Y here if you want kernel low-level debugging support
613 on Rockchip based platforms.
615 config DEBUG_S3C_UART0
616 depends on PLAT_SAMSUNG
617 select DEBUG_EXYNOS_UART if ARCH_EXYNOS
618 bool "Use S3C UART 0 for low-level debug"
620 Say Y here if you want the debug print routines to direct
621 their output to UART 0. The port must have been initialised
622 by the boot-loader before use.
624 The uncompressor code port configuration is now handled
625 by CONFIG_S3C_LOWLEVEL_UART_PORT.
627 config DEBUG_S3C_UART1
628 depends on PLAT_SAMSUNG
629 select DEBUG_EXYNOS_UART if ARCH_EXYNOS
630 bool "Use S3C UART 1 for low-level debug"
632 Say Y here if you want the debug print routines to direct
633 their output to UART 1. The port must have been initialised
634 by the boot-loader before use.
636 The uncompressor code port configuration is now handled
637 by CONFIG_S3C_LOWLEVEL_UART_PORT.
639 config DEBUG_S3C_UART2
640 depends on PLAT_SAMSUNG
641 select DEBUG_EXYNOS_UART if ARCH_EXYNOS
642 bool "Use S3C UART 2 for low-level debug"
644 Say Y here if you want the debug print routines to direct
645 their output to UART 2. The port must have been initialised
646 by the boot-loader before use.
648 The uncompressor code port configuration is now handled
649 by CONFIG_S3C_LOWLEVEL_UART_PORT.
651 config DEBUG_S3C_UART3
652 depends on PLAT_SAMSUNG && ARCH_EXYNOS
653 select DEBUG_EXYNOS_UART
654 bool "Use S3C UART 3 for low-level debug"
656 Say Y here if you want the debug print routines to direct
657 their output to UART 3. The port must have been initialised
658 by the boot-loader before use.
660 The uncompressor code port configuration is now handled
661 by CONFIG_S3C_LOWLEVEL_UART_PORT.
663 config DEBUG_SOCFPGA_UART
664 depends on ARCH_SOCFPGA
665 bool "Use SOCFPGA UART for low-level debug"
666 select DEBUG_UART_8250
668 Say Y here if you want kernel low-level debugging support
669 on SOCFPGA based platforms.
671 config DEBUG_SUNXI_UART0
672 bool "Kernel low-level debugging messages via sunXi UART0"
673 depends on ARCH_SUNXI
674 select DEBUG_UART_8250
676 Say Y here if you want kernel low-level debugging support
677 on Allwinner A1X based platforms on the UART0.
679 config DEBUG_SUNXI_UART1
680 bool "Kernel low-level debugging messages via sunXi UART1"
681 depends on ARCH_SUNXI
682 select DEBUG_UART_8250
684 Say Y here if you want kernel low-level debugging support
685 on Allwinner A1X based platforms on the UART1.
687 config TEGRA_DEBUG_UART_AUTO_ODMDATA
688 bool "Kernel low-level debugging messages via Tegra UART via ODMDATA"
689 depends on ARCH_TEGRA
690 select DEBUG_TEGRA_UART
692 Automatically determines which UART to use for low-level
693 debug based on the ODMDATA value. This value is part of
694 the BCT, and is written to the boot memory device using
695 nvflash, or other flashing tool. When bits 19:18 are 3,
696 then bits 17:15 indicate which UART to use; 0/1/2/3/4
699 config TEGRA_DEBUG_UARTA
700 bool "Kernel low-level debugging messages via Tegra UART A"
701 depends on ARCH_TEGRA
702 select DEBUG_TEGRA_UART
704 Say Y here if you want kernel low-level debugging support
705 on Tegra based platforms.
707 config TEGRA_DEBUG_UARTB
708 bool "Kernel low-level debugging messages via Tegra UART B"
709 depends on ARCH_TEGRA
710 select DEBUG_TEGRA_UART
712 Say Y here if you want kernel low-level debugging support
713 on Tegra based platforms.
715 config TEGRA_DEBUG_UARTC
716 bool "Kernel low-level debugging messages via Tegra UART C"
717 depends on ARCH_TEGRA
718 select DEBUG_TEGRA_UART
720 Say Y here if you want kernel low-level debugging support
721 on Tegra based platforms.
723 config TEGRA_DEBUG_UARTD
724 bool "Kernel low-level debugging messages via Tegra UART D"
725 depends on ARCH_TEGRA
726 select DEBUG_TEGRA_UART
728 Say Y here if you want kernel low-level debugging support
729 on Tegra based platforms.
731 config TEGRA_DEBUG_UARTE
732 bool "Kernel low-level debugging messages via Tegra UART E"
733 depends on ARCH_TEGRA
734 select DEBUG_TEGRA_UART
736 Say Y here if you want kernel low-level debugging support
737 on Tegra based platforms.
739 config DEBUG_SIRFPRIMA2_UART1
740 bool "Kernel low-level debugging messages via SiRFprimaII UART1"
741 depends on ARCH_PRIMA2
743 Say Y here if you want the debug print routines to direct
744 their output to the uart1 port on SiRFprimaII devices.
746 config DEBUG_SIRFMARCO_UART1
747 bool "Kernel low-level debugging messages via SiRFmarco UART1"
748 depends on ARCH_MARCO
750 Say Y here if you want the debug print routines to direct
751 their output to the uart1 port on SiRFmarco devices.
753 config STIH41X_DEBUG_ASC2
754 bool "Use StiH415/416 ASC2 UART for low-level debug"
756 select DEBUG_STI_UART
758 Say Y here if you want kernel low-level debugging support
759 on STiH415/416 based platforms like b2000, which has
760 default UART wired up to ASC2.
764 config STIH41X_DEBUG_SBC_ASC1
765 bool "Use StiH415/416 SBC ASC1 UART for low-level debug"
767 select DEBUG_STI_UART
769 Say Y here if you want kernel low-level debugging support
770 on STiH415/416 based platforms like b2020. which has
771 default UART wired up to SBC ASC1.
775 config DEBUG_U300_UART
776 bool "Kernel low-level debugging messages via U300 UART0"
778 select DEBUG_UART_PL01X
780 Say Y here if you want the debug print routines to direct
781 their output to the uart port on U300 devices.
783 config DEBUG_UX500_UART
784 depends on ARCH_U8500
785 bool "Use Ux500 UART for low-level debug"
787 Say Y here if you want kernel low-level debugging support
788 on Ux500 based platforms.
790 config DEBUG_VEXPRESS_UART0_DETECT
791 bool "Autodetect UART0 on Versatile Express Cortex-A core tiles"
792 depends on ARCH_VEXPRESS && CPU_CP15_MMU
794 This option enables a simple heuristic which tries to determine
795 the motherboard's memory map variant (original or RS1) and then
796 choose the relevant UART0 base address.
798 Note that this will only work with standard A-class core tiles,
799 and may fail with non-standard SMM or custom software models.
801 config DEBUG_VEXPRESS_UART0_CA9
802 bool "Use PL011 UART0 at 0x10009000 (V2P-CA9 core tile)"
803 depends on ARCH_VEXPRESS
804 select DEBUG_UART_PL01X
806 This option selects UART0 at 0x10009000. Except for custom models,
807 this applies only to the V2P-CA9 tile.
809 config DEBUG_VEXPRESS_UART0_RS1
810 bool "Use PL011 UART0 at 0x1c090000 (RS1 complaint tiles)"
811 depends on ARCH_VEXPRESS
812 select DEBUG_UART_PL01X
814 This option selects UART0 at 0x1c090000. This applies to most
815 of the tiles using the RS1 memory map, including all new A-class
816 core tiles, FPGA-based SMMs and software models.
818 config DEBUG_VEXPRESS_UART0_CRX
819 bool "Use PL011 UART0 at 0xb0090000 (Cortex-R compliant tiles)"
820 depends on ARCH_VEXPRESS && !MMU
821 select DEBUG_UART_PL01X
823 This option selects UART0 at 0xb0090000. This is appropriate for
824 Cortex-R series tiles and SMMs, such as Cortex-R5 and Cortex-R7
826 config DEBUG_VT8500_UART0
827 bool "Use UART0 on VIA/Wondermedia SoCs"
828 depends on ARCH_VT8500
830 This option selects UART0 on VIA/Wondermedia System-on-a-chip
831 devices, including VT8500, WM8505, WM8650 and WM8850.
833 config DEBUG_LL_UART_NONE
834 bool "No low-level debugging UART"
835 depends on !ARCH_MULTIPLATFORM
837 Say Y here if your platform doesn't provide a UART option
838 above. This relies on your platform choosing the right UART
839 definition internally in order for low-level debugging to
843 bool "Kernel low-level debugging via EmbeddedICE DCC channel"
845 Say Y here if you want the debug print routines to direct
846 their output to the EmbeddedICE macrocell's DCC channel using
847 co-processor 14. This is known to work on the ARM9 style ICE
848 channel and on the XScale with the PEEDI.
850 Note that the system will appear to hang during boot if there
851 is nothing connected to read from the DCC.
853 config DEBUG_SEMIHOSTING
854 bool "Kernel low-level debug output via semihosting I/O"
856 Semihosting enables code running on an ARM target to use
857 the I/O facilities on a host debugger/emulator through a
858 simple SVC call. The host debugger or emulator must have
859 semihosting enabled for the special svc call to be trapped
860 otherwise the kernel will crash.
862 This is known to work with OpenOCD, as well as
863 ARM's Fast Models, or any other controlling environment
864 that implements semihosting.
866 For more details about semihosting, please see
867 chapter 8 of DUI0203I_rvct_developer_guide.pdf from ARM Ltd.
869 config DEBUG_LL_UART_8250
870 bool "Kernel low-level debugging via 8250 UART"
872 Say Y here if you wish the debug print routes to direct
873 their output to an 8250 UART. You can use this option
874 to provide the parameters for the 8250 UART rather than
875 selecting one of the platform specific options above if
876 you know the parameters for the port.
878 This option is preferred over the platform specific
879 options; the platform specific options are deprecated
880 and will be soon removed.
882 config DEBUG_LL_UART_EFM32
883 bool "Kernel low-level debugging via efm32 UART"
884 depends on ARCH_EFM32
886 Say Y here if you want the debug print routines to direct
887 their output to an UART or USART port on efm32 based
888 machines. Use the following addresses for DEBUG_UART_PHYS:
896 config DEBUG_LL_UART_PL01X
897 bool "Kernel low-level debugging via ARM Ltd PL01x Primecell UART"
899 Say Y here if you wish the debug print routes to direct
900 their output to a PL01x Primecell UART. You can use
901 this option to provide the parameters for the UART
902 rather than selecting one of the platform specific
903 options above if you know the parameters for the port.
905 This option is preferred over the platform specific
906 options; the platform specific options are deprecated
907 and will be soon removed.
911 config DEBUG_EXYNOS_UART
914 config DEBUG_OMAP2PLUS_UART
916 depends on ARCH_OMAP2PLUS
918 config DEBUG_IMX_UART_PORT
919 int "i.MX Debug UART Port Selection" if DEBUG_IMX1_UART || \
920 DEBUG_IMX25_UART || \
921 DEBUG_IMX21_IMX27_UART || \
922 DEBUG_IMX31_UART || \
923 DEBUG_IMX35_UART || \
924 DEBUG_IMX50_UART || \
925 DEBUG_IMX51_UART || \
926 DEBUG_IMX53_UART || \
927 DEBUG_IMX6Q_UART || \
928 DEBUG_IMX6SL_UART || \
933 Choose UART port on which kernel low-level debug messages
936 config DEBUG_VF_UART_PORT
937 int "Vybrid Debug UART Port Selection" if DEBUG_VF_UART
942 Choose UART port on which kernel low-level debug messages
945 config DEBUG_TEGRA_UART
947 depends on ARCH_TEGRA
949 config DEBUG_STI_UART
953 config DEBUG_LL_INCLUDE
955 default "debug/8250.S" if DEBUG_LL_UART_8250 || DEBUG_UART_8250
956 default "debug/pl01x.S" if DEBUG_LL_UART_PL01X || DEBUG_UART_PL01X
957 default "debug/exynos.S" if DEBUG_EXYNOS_UART
958 default "debug/efm32.S" if DEBUG_LL_UART_EFM32
959 default "debug/icedcc.S" if DEBUG_ICEDCC
960 default "debug/imx.S" if DEBUG_IMX1_UART || \
961 DEBUG_IMX25_UART || \
962 DEBUG_IMX21_IMX27_UART || \
963 DEBUG_IMX31_UART || \
964 DEBUG_IMX35_UART || \
965 DEBUG_IMX50_UART || \
966 DEBUG_IMX51_UART || \
968 DEBUG_IMX6Q_UART || \
969 DEBUG_IMX6SL_UART || \
971 default "debug/msm.S" if DEBUG_MSM_UART || DEBUG_QCOM_UARTDM
972 default "debug/omap2plus.S" if DEBUG_OMAP2PLUS_UART
973 default "debug/sirf.S" if DEBUG_SIRFPRIMA2_UART1 || DEBUG_SIRFMARCO_UART1
974 default "debug/sti.S" if DEBUG_STI_UART
975 default "debug/tegra.S" if DEBUG_TEGRA_UART
976 default "debug/ux500.S" if DEBUG_UX500_UART
977 default "debug/vexpress.S" if DEBUG_VEXPRESS_UART0_DETECT
978 default "debug/vf.S" if DEBUG_VF_UART
979 default "debug/vt8500.S" if DEBUG_VT8500_UART0
980 default "debug/zynq.S" if DEBUG_ZYNQ_UART0 || DEBUG_ZYNQ_UART1
981 default "mach/debug-macro.S"
983 # Compatibility options for PL01x
984 config DEBUG_UART_PL01X
985 def_bool ARCH_EP93XX || \
992 # Compatibility options for 8250
993 config DEBUG_UART_8250
994 def_bool ARCH_DOVE || ARCH_EBSA110 || \
995 (FOOTBRIDGE && !DEBUG_DC21285_PORT) || \
996 ARCH_GEMINI || ARCH_IOP13XX || ARCH_IOP32X || \
997 ARCH_IOP33X || ARCH_IXP4XX || ARCH_KIRKWOOD || \
998 ARCH_LPC32XX || ARCH_MV78XX0 || ARCH_ORION5X || ARCH_RPC
1000 config DEBUG_UART_PHYS
1001 hex "Physical base address of debug UART"
1002 default 0x01c20000 if DEBUG_DAVINCI_DMx_UART0
1003 default 0x01c28000 if DEBUG_SUNXI_UART0
1004 default 0x01c28400 if DEBUG_SUNXI_UART1
1005 default 0x01d0c000 if DEBUG_DAVINCI_DA8XX_UART1
1006 default 0x01d0d000 if DEBUG_DAVINCI_DA8XX_UART2
1007 default 0x02530c00 if DEBUG_KEYSTONE_UART0
1008 default 0x02531000 if DEBUG_KEYSTONE_UART1
1009 default 0x03010fe0 if ARCH_RPC
1010 default 0x10009000 if DEBUG_REALVIEW_STD_PORT || DEBUG_CNS3XXX || \
1011 DEBUG_VEXPRESS_UART0_CA9
1012 default 0x1010c000 if DEBUG_REALVIEW_PB1176_PORT
1013 default 0x10124000 if DEBUG_RK3X_UART0
1014 default 0x10126000 if DEBUG_RK3X_UART1
1015 default 0x101f1000 if ARCH_VERSATILE
1016 default 0x101fb000 if DEBUG_NOMADIK_UART
1017 default 0x16000000 if ARCH_INTEGRATOR
1018 default 0x18000300 if DEBUG_BCM_5301X
1019 default 0x1c090000 if DEBUG_VEXPRESS_UART0_RS1
1020 default 0x20060000 if DEBUG_RK29_UART0
1021 default 0x20064000 if DEBUG_RK29_UART1 || DEBUG_RK3X_UART2
1022 default 0x20068000 if DEBUG_RK29_UART2 || DEBUG_RK3X_UART3
1023 default 0x20201000 if DEBUG_BCM2835
1024 default 0x3e000000 if DEBUG_BCM_KONA_UART
1025 default 0x4000e400 if DEBUG_LL_UART_EFM32
1026 default 0x40090000 if ARCH_LPC32XX
1027 default 0x40100000 if DEBUG_PXA_UART1
1028 default 0x42000000 if ARCH_GEMINI
1029 default 0x7c0003f8 if FOOTBRIDGE
1030 default 0x80070000 if DEBUG_IMX23_UART
1031 default 0x80074000 if DEBUG_IMX28_UART
1032 default 0x80230000 if DEBUG_PICOXCELL_UART
1033 default 0x808c0000 if ARCH_EP93XX
1034 default 0x90020000 if DEBUG_NSPIRE_CLASSIC_UART || DEBUG_NSPIRE_CX_UART
1035 default 0xa9a00000 if DEBUG_MSM_UART
1036 default 0xb0090000 if DEBUG_VEXPRESS_UART0_CRX
1037 default 0xc0013000 if DEBUG_U300_UART
1038 default 0xc8000000 if ARCH_IXP4XX && !CPU_BIG_ENDIAN
1039 default 0xc8000003 if ARCH_IXP4XX && CPU_BIG_ENDIAN
1040 default 0xd0000000 if ARCH_SPEAR3XX || ARCH_SPEAR6XX
1041 default 0xd0012000 if DEBUG_MVEBU_UART
1042 default 0xd4017000 if DEBUG_MMP_UART2
1043 default 0xd4018000 if DEBUG_MMP_UART3
1044 default 0xe0000000 if ARCH_SPEAR13XX
1045 default 0xf0000be0 if ARCH_EBSA110
1046 default 0xf1012000 if DEBUG_MVEBU_UART_ALTERNATE
1047 default 0xf1012000 if ARCH_DOVE || ARCH_KIRKWOOD || ARCH_MV78XX0 || \
1049 default 0xf7fc9000 if DEBUG_BERLIN_UART
1050 default 0xf8b00000 if DEBUG_HI3716_UART
1051 default 0xf991e000 if DEBUG_QCOM_UARTDM
1052 default 0xfcb00000 if DEBUG_HI3620_UART
1053 default 0xfe800000 if ARCH_IOP32X
1054 default 0xffc02000 if DEBUG_SOCFPGA_UART
1055 default 0xffd82340 if ARCH_IOP13XX
1056 default 0xfff36000 if DEBUG_HIGHBANK_UART
1057 default 0xfffff700 if ARCH_IOP33X
1058 depends on DEBUG_LL_UART_8250 || DEBUG_LL_UART_PL01X || \
1059 DEBUG_LL_UART_EFM32 || \
1060 DEBUG_UART_8250 || DEBUG_UART_PL01X || \
1061 DEBUG_MSM_UART || DEBUG_QCOM_UARTDM
1063 config DEBUG_UART_VIRT
1064 hex "Virtual base address of debug UART"
1065 default 0xe0010fe0 if ARCH_RPC
1066 default 0xe1000000 if DEBUG_MSM_UART
1067 default 0xf0000be0 if ARCH_EBSA110
1068 default 0xf0009000 if DEBUG_CNS3XXX
1069 default 0xf01fb000 if DEBUG_NOMADIK_UART
1070 default 0xf0201000 if DEBUG_BCM2835
1071 default 0xf1000300 if DEBUG_BCM_5301X
1072 default 0xf11f1000 if ARCH_VERSATILE
1073 default 0xf1600000 if ARCH_INTEGRATOR
1074 default 0xf1c28000 if DEBUG_SUNXI_UART0
1075 default 0xf1c28400 if DEBUG_SUNXI_UART1
1076 default 0xf2100000 if DEBUG_PXA_UART1
1077 default 0xf4090000 if ARCH_LPC32XX
1078 default 0xf4200000 if ARCH_GEMINI
1079 default 0xf7fc9000 if DEBUG_BERLIN_UART
1080 default 0xf8009000 if DEBUG_VEXPRESS_UART0_CA9
1081 default 0xf8090000 if DEBUG_VEXPRESS_UART0_RS1
1082 default 0xfa71e000 if DEBUG_QCOM_UARTDM
1083 default 0xfb009000 if DEBUG_REALVIEW_STD_PORT
1084 default 0xfb10c000 if DEBUG_REALVIEW_PB1176_PORT
1085 default 0xfd000000 if ARCH_SPEAR3XX || ARCH_SPEAR6XX
1086 default 0xfd000000 if ARCH_SPEAR13XX
1087 default 0xfd012000 if ARCH_MV78XX0
1088 default 0xfde12000 if ARCH_DOVE
1089 default 0xfe012000 if ARCH_ORION5X
1090 default 0xfe017000 if DEBUG_MMP_UART2
1091 default 0xfe018000 if DEBUG_MMP_UART3
1092 default 0xfe100000 if DEBUG_IMX23_UART || DEBUG_IMX28_UART
1093 default 0xfe230000 if DEBUG_PICOXCELL_UART
1094 default 0xfe300000 if DEBUG_BCM_KONA_UART
1095 default 0xfe800000 if ARCH_IOP32X
1096 default 0xfeb00000 if DEBUG_HI3620_UART || DEBUG_HI3716_UART
1097 default 0xfeb24000 if DEBUG_RK3X_UART0
1098 default 0xfeb26000 if DEBUG_RK3X_UART1
1099 default 0xfeb30c00 if DEBUG_KEYSTONE_UART0
1100 default 0xfeb31000 if DEBUG_KEYSTONE_UART1
1101 default 0xfec02000 if DEBUG_SOCFPGA_UART
1102 default 0xfec12000 if DEBUG_MVEBU_UART || DEBUG_MVEBU_UART_ALTERNATE
1103 default 0xfec20000 if DEBUG_DAVINCI_DMx_UART0
1104 default 0xfed0c000 if DEBUG_DAVINCI_DA8XX_UART1
1105 default 0xfed0d000 if DEBUG_DAVINCI_DA8XX_UART2
1106 default 0xfed12000 if ARCH_KIRKWOOD
1107 default 0xfed60000 if DEBUG_RK29_UART0
1108 default 0xfed64000 if DEBUG_RK29_UART1 || DEBUG_RK3X_UART2
1109 default 0xfed68000 if DEBUG_RK29_UART2 || DEBUG_RK3X_UART3
1110 default 0xfedc0000 if ARCH_EP93XX
1111 default 0xfee003f8 if FOOTBRIDGE
1112 default 0xfee20000 if DEBUG_NSPIRE_CLASSIC_UART || DEBUG_NSPIRE_CX_UART
1113 default 0xfee82340 if ARCH_IOP13XX
1114 default 0xfef00000 if ARCH_IXP4XX && !CPU_BIG_ENDIAN
1115 default 0xfef00003 if ARCH_IXP4XX && CPU_BIG_ENDIAN
1116 default 0xfef36000 if DEBUG_HIGHBANK_UART
1117 default 0xfefff700 if ARCH_IOP33X
1118 default 0xff003000 if DEBUG_U300_UART
1119 default DEBUG_UART_PHYS if !MMU
1120 depends on DEBUG_LL_UART_8250 || DEBUG_LL_UART_PL01X || \
1121 DEBUG_UART_8250 || DEBUG_UART_PL01X || \
1122 DEBUG_MSM_UART || DEBUG_QCOM_UARTDM
1124 config DEBUG_UART_8250_SHIFT
1125 int "Register offset shift for the 8250 debug UART"
1126 depends on DEBUG_LL_UART_8250 || DEBUG_UART_8250
1127 default 0 if FOOTBRIDGE || ARCH_IOP32X
1130 config DEBUG_UART_8250_WORD
1131 bool "Use 32-bit accesses for 8250 UART"
1132 depends on DEBUG_LL_UART_8250 || DEBUG_UART_8250
1133 depends on DEBUG_UART_8250_SHIFT >= 2
1134 default y if DEBUG_PICOXCELL_UART || DEBUG_SOCFPGA_UART || \
1136 DEBUG_DAVINCI_DMx_UART0 || DEBUG_DAVINCI_DA8XX_UART1 || \
1137 DEBUG_DAVINCI_DA8XX_UART2 || \
1140 config DEBUG_UART_8250_FLOW_CONTROL
1141 bool "Enable flow control for 8250 UART"
1142 depends on DEBUG_LL_UART_8250 || DEBUG_UART_8250
1143 default y if ARCH_EBSA110 || FOOTBRIDGE || ARCH_GEMINI || ARCH_RPC
1145 config DEBUG_UNCOMPRESS
1147 depends on ARCH_MULTIPLATFORM || ARCH_MSM || PLAT_SAMSUNG
1148 default y if DEBUG_LL && !DEBUG_OMAP2PLUS_UART && \
1149 (!DEBUG_TEGRA_UART || !ZBOOT_ROM)
1151 This option influences the normal decompressor output for
1152 multiplatform kernels. Normally, multiplatform kernels disable
1153 decompressor output because it is not possible to know where to
1154 send the decompressor output.
1156 When this option is set, the selected DEBUG_LL output method
1157 will be re-used for normal decompressor output on multiplatform
1161 config UNCOMPRESS_INCLUDE
1163 default "debug/uncompress.h" if ARCH_MULTIPLATFORM || ARCH_MSM || \
1164 PLAT_SAMSUNG || ARCH_EFM32
1165 default "mach/uncompress.h"
1171 Say Y here if you want to have an early console using the
1172 kernel low-level debugging functions. Add earlyprintk to your
1173 kernel parameters to enable this console.
1176 bool "On-chip ETM and ETB"
1179 Enables the on-chip embedded trace macrocell and embedded trace
1180 buffer driver that will allow you to collect traces of the
1183 config ARM_KPROBES_TEST
1184 tristate "Kprobes test module"
1185 depends on KPROBES && MODULES
1187 Perform tests of kprobes API and instruction set simulation.
1189 config PID_IN_CONTEXTIDR
1190 bool "Write the current PID to the CONTEXTIDR register"
1191 depends on CPU_COPY_V6
1193 Enabling this option causes the kernel to write the current PID to
1194 the PROCID field of the CONTEXTIDR register, at the expense of some
1195 additional instructions during context switch. Say Y here only if you
1196 are planning to use hardware trace tools with this kernel.
1198 config DEBUG_SET_MODULE_RONX
1199 bool "Set loadable kernel module data as NX and text as RO"
1202 This option helps catch unintended modifications to loadable
1203 kernel module's text and read-only data. It also prevents execution
1204 of module data. Such protection may interfere with run-time code
1205 patching and dynamic kernel tracing - and they might also protect
1206 against certain classes of kernel exploits.
1207 If in doubt, say "N".