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_KONA_UART
110 bool "Kernel low-level debugging messages via BCM KONA UART"
112 select DEBUG_UART_8250
114 Say Y here if you want kernel low-level debugging support
115 on Broadcom SoC platforms.
116 This low level debug works for Broadcom
117 mobile SoCs in the Kona family of chips (e.g. bcm28155,
120 config DEBUG_BERLIN_UART
121 bool "Marvell Berlin SoC Debug UART"
122 depends on ARCH_BERLIN
123 select DEBUG_UART_8250
125 Say Y here if you want kernel low-level debugging support
126 on Marvell Berlin SoC based platforms.
128 config DEBUG_CLPS711X_UART1
129 bool "Kernel low-level debugging messages via UART1"
130 depends on ARCH_CLPS711X
132 Say Y here if you want the debug print routines to direct
133 their output to the first serial port on these devices.
135 config DEBUG_CLPS711X_UART2
136 bool "Kernel low-level debugging messages via UART2"
137 depends on ARCH_CLPS711X
139 Say Y here if you want the debug print routines to direct
140 their output to the second serial port on these devices.
143 bool "Kernel Kernel low-level debugging on Cavium Networks CNS3xxx"
144 depends on ARCH_CNS3XXX
145 select DEBUG_UART_PL01X
147 Say Y here if you want the debug print routines to direct
148 their output to the CNS3xxx UART0.
150 config DEBUG_DAVINCI_DA8XX_UART1
151 bool "Kernel low-level debugging on DaVinci DA8XX using UART1"
152 depends on ARCH_DAVINCI_DA8XX
153 select DEBUG_UART_8250
155 Say Y here if you want the debug print routines to direct
156 their output to UART1 serial port on DaVinci DA8XX devices.
158 config DEBUG_DAVINCI_DA8XX_UART2
159 bool "Kernel low-level debugging on DaVinci DA8XX using UART2"
160 depends on ARCH_DAVINCI_DA8XX
161 select DEBUG_UART_8250
163 Say Y here if you want the debug print routines to direct
164 their output to UART2 serial port on DaVinci DA8XX devices.
166 config DEBUG_DAVINCI_DMx_UART0
167 bool "Kernel low-level debugging on DaVinci DMx using UART0"
168 depends on ARCH_DAVINCI_DMx
169 select DEBUG_UART_8250
171 Say Y here if you want the debug print routines to direct
172 their output to UART0 serial port on DaVinci DMx devices.
174 config DEBUG_DAVINCI_TNETV107X_UART1
175 bool "Kernel low-level debugging on DaVinci TNETV107x using UART1"
176 depends on ARCH_DAVINCI_TNETV107X
177 select DEBUG_UART_8250
179 Say Y here if you want the debug print routines to direct
180 their output to UART1 serial port on DaVinci TNETV107X
183 config DEBUG_ZYNQ_UART0
184 bool "Kernel low-level debugging on Xilinx Zynq using UART0"
187 Say Y here if you want the debug print routines to direct
188 their output to UART0 on the Zynq platform.
190 config DEBUG_ZYNQ_UART1
191 bool "Kernel low-level debugging on Xilinx Zynq using UART1"
194 Say Y here if you want the debug print routines to direct
195 their output to UART1 on the Zynq platform.
197 If you have a ZC702 board and want early boot messages to
198 appear on the USB serial adaptor, select this option.
200 config DEBUG_DC21285_PORT
201 bool "Kernel low-level debugging messages via footbridge serial port"
202 depends on FOOTBRIDGE
204 Say Y here if you want the debug print routines to direct
205 their output to the serial port in the DC21285 (Footbridge).
207 config DEBUG_FOOTBRIDGE_COM1
208 bool "Kernel low-level debugging messages via footbridge 8250 at PCI COM1"
209 depends on FOOTBRIDGE
211 Say Y here if you want the debug print routines to direct
212 their output to the 8250 at PCI COM1.
214 config DEBUG_HI3620_UART
215 bool "Hisilicon HI3620 Debug UART"
216 depends on ARCH_HI3xxx
217 select DEBUG_UART_PL01X
219 Say Y here if you want kernel low-level debugging support
222 config DEBUG_HI3716_UART
223 bool "Hisilicon Hi3716 Debug UART"
224 depends on ARCH_HI3xxx
225 select DEBUG_UART_PL01X
227 Say Y here if you want kernel low-level debugging support
230 config DEBUG_HIGHBANK_UART
231 bool "Kernel low-level debugging messages via Highbank UART"
232 depends on ARCH_HIGHBANK
233 select DEBUG_UART_PL01X
235 Say Y here if you want the debug print routines to direct
236 their output to the UART on Highbank based devices.
238 config DEBUG_IMX1_UART
239 bool "i.MX1 Debug UART"
242 Say Y here if you want kernel low-level debugging support
245 config DEBUG_IMX23_UART
246 bool "i.MX23 Debug UART"
248 select DEBUG_UART_PL01X
250 Say Y here if you want kernel low-level debugging support
253 config DEBUG_IMX25_UART
254 bool "i.MX25 Debug UART"
257 Say Y here if you want kernel low-level debugging support
260 config DEBUG_IMX21_IMX27_UART
261 bool "i.MX21 and i.MX27 Debug UART"
262 depends on SOC_IMX21 || SOC_IMX27
264 Say Y here if you want kernel low-level debugging support
267 config DEBUG_IMX28_UART
268 bool "i.MX28 Debug UART"
270 select DEBUG_UART_PL01X
272 Say Y here if you want kernel low-level debugging support
275 config DEBUG_IMX31_UART
276 bool "i.MX31 Debug UART"
279 Say Y here if you want kernel low-level debugging support
282 config DEBUG_IMX35_UART
283 bool "i.MX35 Debug UART"
286 Say Y here if you want kernel low-level debugging support
289 config DEBUG_IMX50_UART
290 bool "i.MX50 Debug UART"
293 Say Y here if you want kernel low-level debugging support
296 config DEBUG_IMX51_UART
297 bool "i.MX51 Debug UART"
300 Say Y here if you want kernel low-level debugging support
303 config DEBUG_IMX53_UART
304 bool "i.MX53 Debug UART"
307 Say Y here if you want kernel low-level debugging support
310 config DEBUG_IMX6Q_UART
311 bool "i.MX6Q/DL Debug UART"
314 Say Y here if you want kernel low-level debugging support
317 config DEBUG_IMX6SL_UART
318 bool "i.MX6SL Debug UART"
319 depends on SOC_IMX6SL
321 Say Y here if you want kernel low-level debugging support
324 config DEBUG_KEYSTONE_UART0
325 bool "Kernel low-level debugging on KEYSTONE2 using UART0"
326 depends on ARCH_KEYSTONE
327 select DEBUG_UART_8250
329 Say Y here if you want the debug print routines to direct
330 their output to UART0 serial port on KEYSTONE2 devices.
332 config DEBUG_KEYSTONE_UART1
333 bool "Kernel low-level debugging on KEYSTONE2 using UART1"
334 depends on ARCH_KEYSTONE
335 select DEBUG_UART_8250
337 Say Y here if you want the debug print routines to direct
338 their output to UART1 serial port on KEYSTONE2 devices.
340 config DEBUG_MMP_UART2
341 bool "Kernel low-level debugging message via MMP UART2"
343 select DEBUG_UART_8250
345 Say Y here if you want kernel low-level debugging support
348 config DEBUG_MMP_UART3
349 bool "Kernel low-level debugging message via MMP UART3"
351 select DEBUG_UART_8250
353 Say Y here if you want kernel low-level debugging support
356 config DEBUG_MSM_UART1
357 bool "Kernel low-level debugging messages via MSM UART1"
358 depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50
359 select DEBUG_MSM_UART
361 Say Y here if you want the debug print routines to direct
362 their output to the first serial port on MSM devices.
364 config DEBUG_MSM_UART2
365 bool "Kernel low-level debugging messages via MSM UART2"
366 depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50
367 select DEBUG_MSM_UART
369 Say Y here if you want the debug print routines to direct
370 their output to the second serial port on MSM devices.
372 config DEBUG_MSM_UART3
373 bool "Kernel low-level debugging messages via MSM UART3"
374 depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50
375 select DEBUG_MSM_UART
377 Say Y here if you want the debug print routines to direct
378 their output to the third serial port on MSM devices.
380 config DEBUG_MSM8660_UART
381 bool "Kernel low-level debugging messages via MSM 8660 UART"
382 depends on ARCH_MSM8X60
383 select MSM_HAS_DEBUG_UART_HS
384 select DEBUG_MSM_UART
386 Say Y here if you want the debug print routines to direct
387 their output to the serial port on MSM 8660 devices.
389 config DEBUG_MSM8960_UART
390 bool "Kernel low-level debugging messages via MSM 8960 UART"
391 depends on ARCH_MSM8960
392 select MSM_HAS_DEBUG_UART_HS
393 select DEBUG_MSM_UART
395 Say Y here if you want the debug print routines to direct
396 their output to the serial port on MSM 8960 devices.
398 config DEBUG_MSM8974_UART
399 bool "Kernel low-level debugging messages via MSM 8974 UART"
400 depends on ARCH_MSM8974
401 select MSM_HAS_DEBUG_UART_HS
402 select DEBUG_MSM_UART
404 Say Y here if you want the debug print routines to direct
405 their output to the serial port on MSM 8974 devices.
407 config DEBUG_MVEBU_UART
408 bool "Kernel low-level debugging messages via MVEBU UART (old bootloaders)"
409 depends on ARCH_MVEBU
410 select DEBUG_UART_8250
412 Say Y here if you want kernel low-level debugging support
413 on MVEBU based platforms.
415 This option should be used with the old bootloaders
416 that left the internal registers mapped at
417 0xd0000000. As of today, this is the case on
418 platforms such as the Globalscale Mirabox or the
419 Plathome OpenBlocks AX3, when using the original
422 If the wrong DEBUG_MVEBU_UART* option is selected,
423 when u-boot hands over to the kernel, the system
424 silently crashes, with no serial output at all.
426 config DEBUG_MVEBU_UART_ALTERNATE
427 bool "Kernel low-level debugging messages via MVEBU UART (new bootloaders)"
428 depends on ARCH_MVEBU
429 select DEBUG_UART_8250
431 Say Y here if you want kernel low-level debugging support
432 on MVEBU based platforms.
434 This option should be used with the new bootloaders
435 that remap the internal registers at 0xf1000000.
437 If the wrong DEBUG_MVEBU_UART* option is selected,
438 when u-boot hands over to the kernel, the system
439 silently crashes, with no serial output at all.
445 Say Y here if you want kernel low-level debugging support
446 on Vybrid based platforms.
448 config DEBUG_NOMADIK_UART
449 bool "Kernel low-level debugging messages via NOMADIK UART"
450 depends on ARCH_NOMADIK
451 select DEBUG_UART_PL01X
453 Say Y here if you want kernel low-level debugging support
454 on NOMADIK based platforms.
456 config DEBUG_NSPIRE_CLASSIC_UART
457 bool "Kernel low-level debugging via TI-NSPIRE 8250 UART"
458 depends on ARCH_NSPIRE
459 select DEBUG_UART_8250
461 Say Y here if you want kernel low-level debugging support
462 on TI-NSPIRE classic models.
464 config DEBUG_NSPIRE_CX_UART
465 bool "Kernel low-level debugging via TI-NSPIRE PL011 UART"
466 depends on ARCH_NSPIRE
467 select DEBUG_UART_PL01X
469 Say Y here if you want kernel low-level debugging support
470 on TI-NSPIRE CX models.
472 config DEBUG_OMAP2UART1
473 bool "OMAP2/3/4 UART1 (omap2/3 sdp boards and some omap3 boards)"
474 depends on ARCH_OMAP2PLUS
475 select DEBUG_OMAP2PLUS_UART
477 This covers at least h4, 2430sdp, 3430sdp, 3630sdp,
478 omap3 torpedo and 3530 lv som.
480 config DEBUG_OMAP2UART2
481 bool "Kernel low-level debugging messages via OMAP2/3/4 UART2"
482 depends on ARCH_OMAP2PLUS
483 select DEBUG_OMAP2PLUS_UART
485 config DEBUG_OMAP2UART3
486 bool "Kernel low-level debugging messages via OMAP2 UART3 (n8x0)"
487 depends on ARCH_OMAP2PLUS
488 select DEBUG_OMAP2PLUS_UART
490 config DEBUG_OMAP3UART3
491 bool "Kernel low-level debugging messages via OMAP3 UART3 (most omap3 boards)"
492 depends on ARCH_OMAP2PLUS
493 select DEBUG_OMAP2PLUS_UART
495 This covers at least cm_t3x, beagle, crane, devkit8000,
496 igep00x0, ldp, n900, n9(50), pandora, overo, touchbook,
499 config DEBUG_OMAP4UART3
500 bool "Kernel low-level debugging messages via OMAP4/5 UART3 (omap4 blaze, panda, omap5 sevm)"
501 depends on ARCH_OMAP2PLUS
502 select DEBUG_OMAP2PLUS_UART
504 config DEBUG_OMAP3UART4
505 bool "Kernel low-level debugging messages via OMAP36XX UART4"
506 depends on ARCH_OMAP2PLUS
507 select DEBUG_OMAP2PLUS_UART
509 config DEBUG_OMAP4UART4
510 bool "Kernel low-level debugging messages via OMAP4/5 UART4"
511 depends on ARCH_OMAP2PLUS
512 select DEBUG_OMAP2PLUS_UART
514 config DEBUG_TI81XXUART1
515 bool "Kernel low-level debugging messages via TI81XX UART1 (ti8148evm)"
516 depends on ARCH_OMAP2PLUS
517 select DEBUG_OMAP2PLUS_UART
519 config DEBUG_TI81XXUART2
520 bool "Kernel low-level debugging messages via TI81XX UART2"
521 depends on ARCH_OMAP2PLUS
522 select DEBUG_OMAP2PLUS_UART
524 config DEBUG_TI81XXUART3
525 bool "Kernel low-level debugging messages via TI81XX UART3 (ti8168evm)"
526 depends on ARCH_OMAP2PLUS
527 select DEBUG_OMAP2PLUS_UART
529 config DEBUG_AM33XXUART1
530 bool "Kernel low-level debugging messages via AM33XX UART1"
531 depends on ARCH_OMAP2PLUS
532 select DEBUG_OMAP2PLUS_UART
534 config DEBUG_ZOOM_UART
535 bool "Kernel low-level debugging messages via Zoom2/3 UART"
536 depends on ARCH_OMAP2PLUS
537 select DEBUG_OMAP2PLUS_UART
539 config DEBUG_PICOXCELL_UART
540 depends on ARCH_PICOXCELL
541 bool "Use PicoXcell UART for low-level debug"
542 select DEBUG_UART_8250
544 Say Y here if you want kernel low-level debugging support
545 on PicoXcell based platforms.
547 config DEBUG_PXA_UART1
549 bool "Use PXA UART1 for low-level debug"
550 select DEBUG_UART_8250
552 Say Y here if you want kernel low-level debugging support
555 config DEBUG_REALVIEW_STD_PORT
556 bool "RealView Default UART"
557 depends on ARCH_REALVIEW
558 select DEBUG_UART_PL01X
560 Say Y here if you want the debug print routines to direct
561 their output to the serial port on RealView EB, PB11MP, PBA8
564 config DEBUG_REALVIEW_PB1176_PORT
565 bool "RealView PB1176 UART"
566 depends on MACH_REALVIEW_PB1176
567 select DEBUG_UART_PL01X
569 Say Y here if you want the debug print routines to direct
570 their output to the standard serial port on the RealView
573 config DEBUG_RK29_UART0
574 bool "Kernel low-level debugging messages via Rockchip RK29 UART0"
575 depends on ARCH_ROCKCHIP
576 select DEBUG_UART_8250
578 Say Y here if you want kernel low-level debugging support
579 on Rockchip based platforms.
581 config DEBUG_RK29_UART1
582 bool "Kernel low-level debugging messages via Rockchip RK29 UART1"
583 depends on ARCH_ROCKCHIP
584 select DEBUG_UART_8250
586 Say Y here if you want kernel low-level debugging support
587 on Rockchip based platforms.
589 config DEBUG_RK29_UART2
590 bool "Kernel low-level debugging messages via Rockchip RK29 UART2"
591 depends on ARCH_ROCKCHIP
592 select DEBUG_UART_8250
594 Say Y here if you want kernel low-level debugging support
595 on Rockchip based platforms.
597 config DEBUG_RK3X_UART0
598 bool "Kernel low-level debugging messages via Rockchip RK3X UART0"
599 depends on ARCH_ROCKCHIP
600 select DEBUG_UART_8250
602 Say Y here if you want kernel low-level debugging support
603 on Rockchip based platforms.
605 config DEBUG_RK3X_UART1
606 bool "Kernel low-level debugging messages via Rockchip RK3X UART1"
607 depends on ARCH_ROCKCHIP
608 select DEBUG_UART_8250
610 Say Y here if you want kernel low-level debugging support
611 on Rockchip based platforms.
613 config DEBUG_RK3X_UART2
614 bool "Kernel low-level debugging messages via Rockchip RK3X UART2"
615 depends on ARCH_ROCKCHIP
616 select DEBUG_UART_8250
618 Say Y here if you want kernel low-level debugging support
619 on Rockchip based platforms.
621 config DEBUG_RK3X_UART3
622 bool "Kernel low-level debugging messages via Rockchip RK3X UART3"
623 depends on ARCH_ROCKCHIP
624 select DEBUG_UART_8250
626 Say Y here if you want kernel low-level debugging support
627 on Rockchip based platforms.
629 config DEBUG_S3C_UART0
630 depends on PLAT_SAMSUNG
631 select DEBUG_EXYNOS_UART if ARCH_EXYNOS
632 bool "Use S3C UART 0 for low-level debug"
634 Say Y here if you want the debug print routines to direct
635 their output to UART 0. The port must have been initialised
636 by the boot-loader before use.
638 The uncompressor code port configuration is now handled
639 by CONFIG_S3C_LOWLEVEL_UART_PORT.
641 config DEBUG_S3C_UART1
642 depends on PLAT_SAMSUNG
643 select DEBUG_EXYNOS_UART if ARCH_EXYNOS
644 bool "Use S3C UART 1 for low-level debug"
646 Say Y here if you want the debug print routines to direct
647 their output to UART 1. The port must have been initialised
648 by the boot-loader before use.
650 The uncompressor code port configuration is now handled
651 by CONFIG_S3C_LOWLEVEL_UART_PORT.
653 config DEBUG_S3C_UART2
654 depends on PLAT_SAMSUNG
655 select DEBUG_EXYNOS_UART if ARCH_EXYNOS
656 bool "Use S3C UART 2 for low-level debug"
658 Say Y here if you want the debug print routines to direct
659 their output to UART 2. The port must have been initialised
660 by the boot-loader before use.
662 The uncompressor code port configuration is now handled
663 by CONFIG_S3C_LOWLEVEL_UART_PORT.
665 config DEBUG_S3C_UART3
666 depends on PLAT_SAMSUNG && ARCH_EXYNOS
667 select DEBUG_EXYNOS_UART
668 bool "Use S3C UART 3 for low-level debug"
670 Say Y here if you want the debug print routines to direct
671 their output to UART 3. The port must have been initialised
672 by the boot-loader before use.
674 The uncompressor code port configuration is now handled
675 by CONFIG_S3C_LOWLEVEL_UART_PORT.
677 config DEBUG_SOCFPGA_UART
678 depends on ARCH_SOCFPGA
679 bool "Use SOCFPGA UART for low-level debug"
680 select DEBUG_UART_8250
682 Say Y here if you want kernel low-level debugging support
683 on SOCFPGA based platforms.
685 config DEBUG_SUNXI_UART0
686 bool "Kernel low-level debugging messages via sunXi UART0"
687 depends on ARCH_SUNXI
688 select DEBUG_UART_8250
690 Say Y here if you want kernel low-level debugging support
691 on Allwinner A1X based platforms on the UART0.
693 config DEBUG_SUNXI_UART1
694 bool "Kernel low-level debugging messages via sunXi UART1"
695 depends on ARCH_SUNXI
696 select DEBUG_UART_8250
698 Say Y here if you want kernel low-level debugging support
699 on Allwinner A1X based platforms on the UART1.
701 config TEGRA_DEBUG_UART_AUTO_ODMDATA
702 bool "Kernel low-level debugging messages via Tegra UART via ODMDATA"
703 depends on ARCH_TEGRA
704 select DEBUG_TEGRA_UART
706 Automatically determines which UART to use for low-level
707 debug based on the ODMDATA value. This value is part of
708 the BCT, and is written to the boot memory device using
709 nvflash, or other flashing tool. When bits 19:18 are 3,
710 then bits 17:15 indicate which UART to use; 0/1/2/3/4
713 config TEGRA_DEBUG_UARTA
714 bool "Kernel low-level debugging messages via Tegra UART A"
715 depends on ARCH_TEGRA
716 select DEBUG_TEGRA_UART
718 Say Y here if you want kernel low-level debugging support
719 on Tegra based platforms.
721 config TEGRA_DEBUG_UARTB
722 bool "Kernel low-level debugging messages via Tegra UART B"
723 depends on ARCH_TEGRA
724 select DEBUG_TEGRA_UART
726 Say Y here if you want kernel low-level debugging support
727 on Tegra based platforms.
729 config TEGRA_DEBUG_UARTC
730 bool "Kernel low-level debugging messages via Tegra UART C"
731 depends on ARCH_TEGRA
732 select DEBUG_TEGRA_UART
734 Say Y here if you want kernel low-level debugging support
735 on Tegra based platforms.
737 config TEGRA_DEBUG_UARTD
738 bool "Kernel low-level debugging messages via Tegra UART D"
739 depends on ARCH_TEGRA
740 select DEBUG_TEGRA_UART
742 Say Y here if you want kernel low-level debugging support
743 on Tegra based platforms.
745 config TEGRA_DEBUG_UARTE
746 bool "Kernel low-level debugging messages via Tegra UART E"
747 depends on ARCH_TEGRA
748 select DEBUG_TEGRA_UART
750 Say Y here if you want kernel low-level debugging support
751 on Tegra based platforms.
753 config DEBUG_SIRFPRIMA2_UART1
754 bool "Kernel low-level debugging messages via SiRFprimaII UART1"
755 depends on ARCH_PRIMA2
757 Say Y here if you want the debug print routines to direct
758 their output to the uart1 port on SiRFprimaII devices.
760 config DEBUG_SIRFMARCO_UART1
761 bool "Kernel low-level debugging messages via SiRFmarco UART1"
762 depends on ARCH_MARCO
764 Say Y here if you want the debug print routines to direct
765 their output to the uart1 port on SiRFmarco devices.
767 config STIH41X_DEBUG_ASC2
768 bool "Use StiH415/416 ASC2 UART for low-level debug"
770 select DEBUG_STI_UART
772 Say Y here if you want kernel low-level debugging support
773 on STiH415/416 based platforms like b2000, which has
774 default UART wired up to ASC2.
778 config STIH41X_DEBUG_SBC_ASC1
779 bool "Use StiH415/416 SBC ASC1 UART for low-level debug"
781 select DEBUG_STI_UART
783 Say Y here if you want kernel low-level debugging support
784 on STiH415/416 based platforms like b2020. which has
785 default UART wired up to SBC ASC1.
789 config DEBUG_U300_UART
790 bool "Kernel low-level debugging messages via U300 UART0"
792 select DEBUG_UART_PL01X
794 Say Y here if you want the debug print routines to direct
795 their output to the uart port on U300 devices.
797 config DEBUG_UX500_UART
798 depends on ARCH_U8500
799 bool "Use Ux500 UART for low-level debug"
801 Say Y here if you want kernel low-level debugging support
802 on Ux500 based platforms.
804 config DEBUG_VEXPRESS_UART0_DETECT
805 bool "Autodetect UART0 on Versatile Express Cortex-A core tiles"
806 depends on ARCH_VEXPRESS && CPU_CP15_MMU
808 This option enables a simple heuristic which tries to determine
809 the motherboard's memory map variant (original or RS1) and then
810 choose the relevant UART0 base address.
812 Note that this will only work with standard A-class core tiles,
813 and may fail with non-standard SMM or custom software models.
815 config DEBUG_VEXPRESS_UART0_CA9
816 bool "Use PL011 UART0 at 0x10009000 (V2P-CA9 core tile)"
817 depends on ARCH_VEXPRESS
818 select DEBUG_UART_PL01X
820 This option selects UART0 at 0x10009000. Except for custom models,
821 this applies only to the V2P-CA9 tile.
823 config DEBUG_VEXPRESS_UART0_RS1
824 bool "Use PL011 UART0 at 0x1c090000 (RS1 complaint tiles)"
825 depends on ARCH_VEXPRESS
826 select DEBUG_UART_PL01X
828 This option selects UART0 at 0x1c090000. This applies to most
829 of the tiles using the RS1 memory map, including all new A-class
830 core tiles, FPGA-based SMMs and software models.
832 config DEBUG_VEXPRESS_UART0_CRX
833 bool "Use PL011 UART0 at 0xb0090000 (Cortex-R compliant tiles)"
834 depends on ARCH_VEXPRESS && !MMU
835 select DEBUG_UART_PL01X
837 This option selects UART0 at 0xb0090000. This is appropriate for
838 Cortex-R series tiles and SMMs, such as Cortex-R5 and Cortex-R7
840 config DEBUG_VT8500_UART0
841 bool "Use UART0 on VIA/Wondermedia SoCs"
842 depends on ARCH_VT8500
844 This option selects UART0 on VIA/Wondermedia System-on-a-chip
845 devices, including VT8500, WM8505, WM8650 and WM8850.
847 config DEBUG_LL_UART_NONE
848 bool "No low-level debugging UART"
849 depends on !ARCH_MULTIPLATFORM
851 Say Y here if your platform doesn't provide a UART option
852 above. This relies on your platform choosing the right UART
853 definition internally in order for low-level debugging to
857 bool "Kernel low-level debugging via EmbeddedICE DCC channel"
859 Say Y here if you want the debug print routines to direct
860 their output to the EmbeddedICE macrocell's DCC channel using
861 co-processor 14. This is known to work on the ARM9 style ICE
862 channel and on the XScale with the PEEDI.
864 Note that the system will appear to hang during boot if there
865 is nothing connected to read from the DCC.
867 config DEBUG_SEMIHOSTING
868 bool "Kernel low-level debug output via semihosting I/O"
870 Semihosting enables code running on an ARM target to use
871 the I/O facilities on a host debugger/emulator through a
872 simple SVC call. The host debugger or emulator must have
873 semihosting enabled for the special svc call to be trapped
874 otherwise the kernel will crash.
876 This is known to work with OpenOCD, as well as
877 ARM's Fast Models, or any other controlling environment
878 that implements semihosting.
880 For more details about semihosting, please see
881 chapter 8 of DUI0203I_rvct_developer_guide.pdf from ARM Ltd.
883 config DEBUG_LL_UART_8250
884 bool "Kernel low-level debugging via 8250 UART"
886 Say Y here if you wish the debug print routes to direct
887 their output to an 8250 UART. You can use this option
888 to provide the parameters for the 8250 UART rather than
889 selecting one of the platform specific options above if
890 you know the parameters for the port.
892 This option is preferred over the platform specific
893 options; the platform specific options are deprecated
894 and will be soon removed.
896 config DEBUG_LL_UART_EFM32
897 bool "Kernel low-level debugging via efm32 UART"
898 depends on ARCH_EFM32
900 Say Y here if you want the debug print routines to direct
901 their output to an UART or USART port on efm32 based
902 machines. Use the following addresses for DEBUG_UART_PHYS:
910 config DEBUG_LL_UART_PL01X
911 bool "Kernel low-level debugging via ARM Ltd PL01x Primecell UART"
913 Say Y here if you wish the debug print routes to direct
914 their output to a PL01x Primecell UART. You can use
915 this option to provide the parameters for the UART
916 rather than selecting one of the platform specific
917 options above if you know the parameters for the port.
919 This option is preferred over the platform specific
920 options; the platform specific options are deprecated
921 and will be soon removed.
925 config DEBUG_EXYNOS_UART
928 config DEBUG_OMAP2PLUS_UART
930 depends on ARCH_OMAP2PLUS
932 config DEBUG_IMX_UART_PORT
933 int "i.MX Debug UART Port Selection" if DEBUG_IMX1_UART || \
934 DEBUG_IMX25_UART || \
935 DEBUG_IMX21_IMX27_UART || \
936 DEBUG_IMX31_UART || \
937 DEBUG_IMX35_UART || \
938 DEBUG_IMX50_UART || \
939 DEBUG_IMX51_UART || \
940 DEBUG_IMX53_UART || \
941 DEBUG_IMX6Q_UART || \
946 Choose UART port on which kernel low-level debug messages
949 config DEBUG_TEGRA_UART
951 depends on ARCH_TEGRA
953 config DEBUG_STI_UART
957 config DEBUG_MSM_UART
961 config DEBUG_LL_INCLUDE
963 default "debug/8250.S" if DEBUG_LL_UART_8250 || DEBUG_UART_8250
964 default "debug/pl01x.S" if DEBUG_LL_UART_PL01X || DEBUG_UART_PL01X
965 default "debug/exynos.S" if DEBUG_EXYNOS_UART
966 default "debug/efm32.S" if DEBUG_LL_UART_EFM32
967 default "debug/icedcc.S" if DEBUG_ICEDCC
968 default "debug/imx.S" if DEBUG_IMX1_UART || \
969 DEBUG_IMX25_UART || \
970 DEBUG_IMX21_IMX27_UART || \
971 DEBUG_IMX31_UART || \
972 DEBUG_IMX35_UART || \
973 DEBUG_IMX50_UART || \
974 DEBUG_IMX51_UART || \
976 DEBUG_IMX6Q_UART || \
978 default "debug/msm.S" if DEBUG_MSM_UART
979 default "debug/omap2plus.S" if DEBUG_OMAP2PLUS_UART
980 default "debug/sirf.S" if DEBUG_SIRFPRIMA2_UART1 || DEBUG_SIRFMARCO_UART1
981 default "debug/sti.S" if DEBUG_STI_UART
982 default "debug/tegra.S" if DEBUG_TEGRA_UART
983 default "debug/ux500.S" if DEBUG_UX500_UART
984 default "debug/vexpress.S" if DEBUG_VEXPRESS_UART0_DETECT
985 default "debug/vf.S" if DEBUG_VF_UART
986 default "debug/vt8500.S" if DEBUG_VT8500_UART0
987 default "debug/zynq.S" if DEBUG_ZYNQ_UART0 || DEBUG_ZYNQ_UART1
988 default "mach/debug-macro.S"
990 # Compatibility options for PL01x
991 config DEBUG_UART_PL01X
992 def_bool ARCH_EP93XX || \
999 # Compatibility options for 8250
1000 config DEBUG_UART_8250
1001 def_bool ARCH_DOVE || ARCH_EBSA110 || \
1002 (FOOTBRIDGE && !DEBUG_DC21285_PORT) || \
1003 ARCH_GEMINI || ARCH_IOP13XX || ARCH_IOP32X || \
1004 ARCH_IOP33X || ARCH_IXP4XX || ARCH_KIRKWOOD || \
1005 ARCH_LPC32XX || ARCH_MV78XX0 || ARCH_ORION5X || ARCH_RPC
1007 config DEBUG_UART_PHYS
1008 hex "Physical base address of debug UART"
1009 default 0x01c20000 if DEBUG_DAVINCI_DMx_UART0
1010 default 0x01c28000 if DEBUG_SUNXI_UART0
1011 default 0x01c28400 if DEBUG_SUNXI_UART1
1012 default 0x01d0c000 if DEBUG_DAVINCI_DA8XX_UART1
1013 default 0x01d0d000 if DEBUG_DAVINCI_DA8XX_UART2
1014 default 0x02530c00 if DEBUG_KEYSTONE_UART0
1015 default 0x02531000 if DEBUG_KEYSTONE_UART1
1016 default 0x03010fe0 if ARCH_RPC
1017 default 0x08108300 if DEBUG_DAVINCI_TNETV107X_UART1
1018 default 0x10009000 if DEBUG_REALVIEW_STD_PORT || DEBUG_CNS3XXX || \
1019 DEBUG_VEXPRESS_UART0_CA9
1020 default 0x1010c000 if DEBUG_REALVIEW_PB1176_PORT
1021 default 0x10124000 if DEBUG_RK3X_UART0
1022 default 0x10126000 if DEBUG_RK3X_UART1
1023 default 0x101f1000 if ARCH_VERSATILE
1024 default 0x101fb000 if DEBUG_NOMADIK_UART
1025 default 0x16000000 if ARCH_INTEGRATOR
1026 default 0x1c090000 if DEBUG_VEXPRESS_UART0_RS1
1027 default 0x20060000 if DEBUG_RK29_UART0
1028 default 0x20064000 if DEBUG_RK29_UART1 || DEBUG_RK3X_UART2
1029 default 0x20068000 if DEBUG_RK29_UART2 || DEBUG_RK3X_UART3
1030 default 0x20201000 if DEBUG_BCM2835
1031 default 0x3e000000 if DEBUG_BCM_KONA_UART
1032 default 0x4000e400 if DEBUG_LL_UART_EFM32
1033 default 0x40090000 if ARCH_LPC32XX
1034 default 0x40100000 if DEBUG_PXA_UART1
1035 default 0x42000000 if ARCH_GEMINI
1036 default 0x7c0003f8 if FOOTBRIDGE
1037 default 0x80230000 if DEBUG_PICOXCELL_UART
1038 default 0x80070000 if DEBUG_IMX23_UART
1039 default 0x80074000 if DEBUG_IMX28_UART
1040 default 0x808c0000 if ARCH_EP93XX
1041 default 0x90020000 if DEBUG_NSPIRE_CLASSIC_UART || DEBUG_NSPIRE_CX_UART
1042 default 0xb0090000 if DEBUG_VEXPRESS_UART0_CRX
1043 default 0xc0013000 if DEBUG_U300_UART
1044 default 0xc8000000 if ARCH_IXP4XX && !CPU_BIG_ENDIAN
1045 default 0xc8000003 if ARCH_IXP4XX && CPU_BIG_ENDIAN
1046 default 0xd0000000 if ARCH_SPEAR3XX || ARCH_SPEAR6XX
1047 default 0xd0012000 if DEBUG_MVEBU_UART
1048 default 0xd4017000 if DEBUG_MMP_UART2
1049 default 0xd4018000 if DEBUG_MMP_UART3
1050 default 0xe0000000 if ARCH_SPEAR13XX
1051 default 0xf0000be0 if ARCH_EBSA110
1052 default 0xf1012000 if DEBUG_MVEBU_UART_ALTERNATE
1053 default 0xf1012000 if ARCH_DOVE || ARCH_KIRKWOOD || ARCH_MV78XX0 || \
1055 default 0xf7fc9000 if DEBUG_BERLIN_UART
1056 default 0xf8b00000 if DEBUG_HI3716_UART
1057 default 0xfcb00000 if DEBUG_HI3620_UART
1058 default 0xfe800000 if ARCH_IOP32X
1059 default 0xffc02000 if DEBUG_SOCFPGA_UART
1060 default 0xffd82340 if ARCH_IOP13XX
1061 default 0xfff36000 if DEBUG_HIGHBANK_UART
1062 default 0xfffff700 if ARCH_IOP33X
1063 depends on DEBUG_LL_UART_8250 || DEBUG_LL_UART_PL01X || \
1064 DEBUG_LL_UART_EFM32 || \
1065 DEBUG_UART_8250 || DEBUG_UART_PL01X
1067 config DEBUG_UART_VIRT
1068 hex "Virtual base address of debug UART"
1069 default 0xe0010fe0 if ARCH_RPC
1070 default 0xf0000be0 if ARCH_EBSA110
1071 default 0xf0009000 if DEBUG_CNS3XXX
1072 default 0xf01fb000 if DEBUG_NOMADIK_UART
1073 default 0xf0201000 if DEBUG_BCM2835
1074 default 0xf11f1000 if ARCH_VERSATILE
1075 default 0xf1600000 if ARCH_INTEGRATOR
1076 default 0xf1c28000 if DEBUG_SUNXI_UART0
1077 default 0xf1c28400 if DEBUG_SUNXI_UART1
1078 default 0xf2100000 if DEBUG_PXA_UART1
1079 default 0xf4090000 if ARCH_LPC32XX
1080 default 0xf4200000 if ARCH_GEMINI
1081 default 0xf7fc9000 if DEBUG_BERLIN_UART
1082 default 0xf8009000 if DEBUG_VEXPRESS_UART0_CA9
1083 default 0xf8090000 if DEBUG_VEXPRESS_UART0_RS1
1084 default 0xfb009000 if DEBUG_REALVIEW_STD_PORT
1085 default 0xfb10c000 if DEBUG_REALVIEW_PB1176_PORT
1086 default 0xfd000000 if ARCH_SPEAR3XX || ARCH_SPEAR6XX
1087 default 0xfd000000 if ARCH_SPEAR13XX
1088 default 0xfd012000 if ARCH_MV78XX0
1089 default 0xfde12000 if ARCH_DOVE
1090 default 0xfe012000 if ARCH_ORION5X
1091 default 0xfe017000 if DEBUG_MMP_UART2
1092 default 0xfe018000 if DEBUG_MMP_UART3
1093 default 0xfe100000 if DEBUG_IMX23_UART || DEBUG_IMX28_UART
1094 default 0xfe230000 if DEBUG_PICOXCELL_UART
1095 default 0xfe300000 if DEBUG_BCM_KONA_UART
1096 default 0xfe800000 if ARCH_IOP32X
1097 default 0xfeb00000 if DEBUG_HI3620_UART || DEBUG_HI3716_UART
1098 default 0xfeb24000 if DEBUG_RK3X_UART0
1099 default 0xfeb26000 if DEBUG_RK3X_UART1
1100 default 0xfeb30c00 if DEBUG_KEYSTONE_UART0
1101 default 0xfeb31000 if DEBUG_KEYSTONE_UART1
1102 default 0xfec12000 if DEBUG_MVEBU_UART || DEBUG_MVEBU_UART_ALTERNATE
1103 default 0xfed60000 if DEBUG_RK29_UART0
1104 default 0xfed64000 if DEBUG_RK29_UART1 || DEBUG_RK3X_UART2
1105 default 0xfed68000 if DEBUG_RK29_UART2 || DEBUG_RK3X_UART3
1106 default 0xfec02000 if DEBUG_SOCFPGA_UART
1107 default 0xfec20000 if DEBUG_DAVINCI_DMx_UART0
1108 default 0xfed0c000 if DEBUG_DAVINCI_DA8XX_UART1
1109 default 0xfed0d000 if DEBUG_DAVINCI_DA8XX_UART2
1110 default 0xfed12000 if ARCH_KIRKWOOD
1111 default 0xfedc0000 if ARCH_EP93XX
1112 default 0xfee003f8 if FOOTBRIDGE
1113 default 0xfee08300 if DEBUG_DAVINCI_TNETV107X_UART1
1114 default 0xfee20000 if DEBUG_NSPIRE_CLASSIC_UART || DEBUG_NSPIRE_CX_UART
1115 default 0xfef36000 if DEBUG_HIGHBANK_UART
1116 default 0xfee82340 if ARCH_IOP13XX
1117 default 0xfef00000 if ARCH_IXP4XX && !CPU_BIG_ENDIAN
1118 default 0xfef00003 if ARCH_IXP4XX && CPU_BIG_ENDIAN
1119 default 0xfefff700 if ARCH_IOP33X
1120 default 0xff003000 if DEBUG_U300_UART
1121 default DEBUG_UART_PHYS if !MMU
1122 depends on DEBUG_LL_UART_8250 || DEBUG_LL_UART_PL01X || \
1123 DEBUG_UART_8250 || DEBUG_UART_PL01X
1125 config DEBUG_UART_8250_SHIFT
1126 int "Register offset shift for the 8250 debug UART"
1127 depends on DEBUG_LL_UART_8250 || DEBUG_UART_8250
1128 default 0 if FOOTBRIDGE || ARCH_IOP32X
1131 config DEBUG_UART_8250_WORD
1132 bool "Use 32-bit accesses for 8250 UART"
1133 depends on DEBUG_LL_UART_8250 || DEBUG_UART_8250
1134 depends on DEBUG_UART_8250_SHIFT >= 2
1135 default y if DEBUG_PICOXCELL_UART || DEBUG_SOCFPGA_UART || \
1137 DEBUG_DAVINCI_DMx_UART0 || DEBUG_DAVINCI_DA8XX_UART1 || \
1138 DEBUG_DAVINCI_DA8XX_UART2 || DEBUG_DAVINCI_TNETV107X_UART1 || \
1141 config DEBUG_UART_8250_FLOW_CONTROL
1142 bool "Enable flow control for 8250 UART"
1143 depends on DEBUG_LL_UART_8250 || DEBUG_UART_8250
1144 default y if ARCH_EBSA110 || FOOTBRIDGE || ARCH_GEMINI || ARCH_RPC
1146 config DEBUG_UNCOMPRESS
1148 depends on ARCH_MULTIPLATFORM || ARCH_MSM
1149 default y if DEBUG_LL && !DEBUG_OMAP2PLUS_UART && \
1150 (!DEBUG_TEGRA_UART || !ZBOOT_ROM)
1152 This option influences the normal decompressor output for
1153 multiplatform kernels. Normally, multiplatform kernels disable
1154 decompressor output because it is not possible to know where to
1155 send the decompressor output.
1157 When this option is set, the selected DEBUG_LL output method
1158 will be re-used for normal decompressor output on multiplatform
1162 config UNCOMPRESS_INCLUDE
1164 default "debug/uncompress.h" if ARCH_MULTIPLATFORM || ARCH_MSM
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".