3 source "lib/Kconfig.debug"
6 bool "Filter access to /dev/mem"
9 If this option is disabled, you allow userspace (root) access to all
10 of memory, including kernel and userspace memory. Accidental
11 access to this is obviously disastrous, but specific access can
12 be used by people debugging the kernel.
14 If this option is switched on, the /dev/mem file only allows
15 userspace access to memory mapped peripherals.
19 # RMK wants arm kernels compiled with frame pointers or stack unwinding.
20 # If you know what you are doing and are willing to live without stack
21 # traces, you can get a slightly smaller kernel by setting this option to
22 # n, but then RMK will have to kill you ;).
25 depends on !THUMB2_KERNEL
26 default y if !ARM_UNWIND || FUNCTION_GRAPH_TRACER
28 If you say N here, the resulting kernel will be slightly smaller and
29 faster. However, if neither FRAME_POINTER nor ARM_UNWIND are enabled,
30 when a problem occurs with the kernel, the information that is
31 reported is severely limited.
34 bool "Enable stack unwinding support (EXPERIMENTAL)"
38 This option enables stack unwinding support in the kernel
39 using the information automatically generated by the
40 compiler. The resulting kernel image is slightly bigger but
41 the performance is not affected. Currently, this feature
42 only works with EABI compilers. If unsure say Y.
46 depends on FUNCTION_TRACER && FRAME_POINTER
50 bool "Verbose user fault messages"
52 When a user program crashes due to an exception, the kernel can
53 print a brief message explaining what the problem was. This is
54 sometimes helpful for debugging but serves no purpose on a
55 production system. Most people should say N here.
57 In addition, you need to pass user_debug=N on the kernel command
58 line to enable this feature. N consists of the sum of:
60 1 - undefined instruction events
62 4 - invalid data aborts
66 # These options are only for real kernel hackers who want to get their hands dirty.
68 bool "Kernel low-level debugging functions (read help!)"
69 depends on DEBUG_KERNEL
71 Say Y here to include definitions of printascii, printch, printhex
72 in the kernel. This is helpful if you are debugging code that
73 executes before the console is initialized.
75 Note that selecting this option will limit the kernel to a single
76 UART definition, as specified below. Attempting to boot the kernel
77 image on a different platform *will not work*, so this option should
78 not be enabled for kernels that are intended to be portable.
81 prompt "Kernel low-level debugging port"
84 config AT91_DEBUG_LL_DBGU0
85 bool "Kernel low-level debugging on rm9200, 9260/9g20, 9261/9g10 and 9rl"
86 depends on HAVE_AT91_DBGU0
88 config AT91_DEBUG_LL_DBGU1
89 bool "Kernel low-level debugging on 9263 and 9g45"
90 depends on HAVE_AT91_DBGU1
93 bool "Kernel low-level debugging on BCM2835 PL011 UART"
94 depends on ARCH_BCM2835
96 config DEBUG_CLPS711X_UART1
97 bool "Kernel low-level debugging messages via UART1"
98 depends on ARCH_CLPS711X
100 Say Y here if you want the debug print routines to direct
101 their output to the first serial port on these devices.
103 config DEBUG_CLPS711X_UART2
104 bool "Kernel low-level debugging messages via UART2"
105 depends on ARCH_CLPS711X
107 Say Y here if you want the debug print routines to direct
108 their output to the second serial port on these devices.
111 bool "Kernel Kernel low-level debugging on Cavium Networks CNS3xxx"
112 depends on ARCH_CNS3XXX
114 Say Y here if you want the debug print routines to direct
115 their output to the CNS3xxx UART0.
117 config DEBUG_DAVINCI_DA8XX_UART1
118 bool "Kernel low-level debugging on DaVinci DA8XX using UART1"
119 depends on ARCH_DAVINCI_DA8XX
121 Say Y here if you want the debug print routines to direct
122 their output to UART1 serial port on DaVinci DA8XX devices.
124 config DEBUG_DAVINCI_DA8XX_UART2
125 bool "Kernel low-level debugging on DaVinci DA8XX using UART2"
126 depends on ARCH_DAVINCI_DA8XX
128 Say Y here if you want the debug print routines to direct
129 their output to UART2 serial port on DaVinci DA8XX devices.
131 config DEBUG_DAVINCI_DMx_UART0
132 bool "Kernel low-level debugging on DaVinci DMx using UART0"
133 depends on ARCH_DAVINCI_DMx
135 Say Y here if you want the debug print routines to direct
136 their output to UART0 serial port on DaVinci DMx devices.
138 config DEBUG_DAVINCI_TNETV107X_UART1
139 bool "Kernel low-level debugging on DaVinci TNETV107x using UART1"
140 depends on ARCH_DAVINCI_TNETV107X
142 Say Y here if you want the debug print routines to direct
143 their output to UART1 serial port on DaVinci TNETV107X
146 config DEBUG_ZYNQ_UART0
147 bool "Kernel low-level debugging on Xilinx Zynq using UART0"
150 Say Y here if you want the debug print routines to direct
151 their output to UART0 on the Zynq platform.
153 config DEBUG_ZYNQ_UART1
154 bool "Kernel low-level debugging on Xilinx Zynq using UART1"
157 Say Y here if you want the debug print routines to direct
158 their output to UART1 on the Zynq platform.
160 If you have a ZC702 board and want early boot messages to
161 appear on the USB serial adaptor, select this option.
163 config DEBUG_DC21285_PORT
164 bool "Kernel low-level debugging messages via footbridge serial port"
165 depends on FOOTBRIDGE
167 Say Y here if you want the debug print routines to direct
168 their output to the serial port in the DC21285 (Footbridge).
170 config DEBUG_FOOTBRIDGE_COM1
171 bool "Kernel low-level debugging messages via footbridge 8250 at PCI COM1"
172 depends on FOOTBRIDGE
174 Say Y here if you want the debug print routines to direct
175 their output to the 8250 at PCI COM1.
177 config DEBUG_HIGHBANK_UART
178 bool "Kernel low-level debugging messages via Highbank UART"
179 depends on ARCH_HIGHBANK
181 Say Y here if you want the debug print routines to direct
182 their output to the UART on Highbank based devices.
184 config DEBUG_IMX1_UART
185 bool "i.MX1 Debug UART"
188 Say Y here if you want kernel low-level debugging support
191 config DEBUG_IMX23_UART
192 bool "i.MX23 Debug UART"
195 Say Y here if you want kernel low-level debugging support
198 config DEBUG_IMX25_UART
199 bool "i.MX25 Debug UART"
202 Say Y here if you want kernel low-level debugging support
205 config DEBUG_IMX21_IMX27_UART
206 bool "i.MX21 and i.MX27 Debug UART"
207 depends on SOC_IMX21 || SOC_IMX27
209 Say Y here if you want kernel low-level debugging support
212 config DEBUG_IMX28_UART
213 bool "i.MX28 Debug UART"
216 Say Y here if you want kernel low-level debugging support
219 config DEBUG_IMX31_UART
220 bool "i.MX31 Debug UART"
223 Say Y here if you want kernel low-level debugging support
226 config DEBUG_IMX35_UART
227 bool "i.MX35 Debug UART"
230 Say Y here if you want kernel low-level debugging support
233 config DEBUG_IMX51_UART
234 bool "i.MX51 Debug UART"
237 Say Y here if you want kernel low-level debugging support
240 config DEBUG_IMX53_UART
241 bool "i.MX53 Debug UART"
244 Say Y here if you want kernel low-level debugging support
247 config DEBUG_IMX6Q_UART
248 bool "i.MX6Q/DL Debug UART"
251 Say Y here if you want kernel low-level debugging support
254 config DEBUG_MMP_UART2
255 bool "Kernel low-level debugging message via MMP UART2"
258 Say Y here if you want kernel low-level debugging support
261 config DEBUG_MMP_UART3
262 bool "Kernel low-level debugging message via MMP UART3"
265 Say Y here if you want kernel low-level debugging support
268 config DEBUG_MSM_UART1
269 bool "Kernel low-level debugging messages via MSM UART1"
270 depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50
272 Say Y here if you want the debug print routines to direct
273 their output to the first serial port on MSM devices.
275 config DEBUG_MSM_UART2
276 bool "Kernel low-level debugging messages via MSM UART2"
277 depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50
279 Say Y here if you want the debug print routines to direct
280 their output to the second serial port on MSM devices.
282 config DEBUG_MSM_UART3
283 bool "Kernel low-level debugging messages via MSM UART3"
284 depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50
286 Say Y here if you want the debug print routines to direct
287 their output to the third serial port on MSM devices.
289 config DEBUG_MSM8660_UART
290 bool "Kernel low-level debugging messages via MSM 8660 UART"
291 depends on ARCH_MSM8X60
292 select MSM_HAS_DEBUG_UART_HS
294 Say Y here if you want the debug print routines to direct
295 their output to the serial port on MSM 8660 devices.
297 config DEBUG_MSM8960_UART
298 bool "Kernel low-level debugging messages via MSM 8960 UART"
299 depends on ARCH_MSM8960
300 select MSM_HAS_DEBUG_UART_HS
302 Say Y here if you want the debug print routines to direct
303 their output to the serial port on MSM 8960 devices.
305 config DEBUG_MVEBU_UART
306 bool "Kernel low-level debugging messages via MVEBU UART"
307 depends on ARCH_MVEBU
309 Say Y here if you want kernel low-level debugging support
310 on MVEBU based platforms.
312 config DEBUG_NOMADIK_UART
313 bool "Kernel low-level debugging messages via NOMADIK UART"
314 depends on ARCH_NOMADIK
316 Say Y here if you want kernel low-level debugging support
317 on NOMADIK based platforms.
319 config DEBUG_OMAP2PLUS_UART
320 bool "Kernel low-level debugging messages via OMAP2PLUS UART"
321 depends on ARCH_OMAP2PLUS
323 Say Y here if you want kernel low-level debugging support
324 on OMAP2PLUS based platforms.
326 config DEBUG_PICOXCELL_UART
327 depends on ARCH_PICOXCELL
328 bool "Use PicoXcell UART for low-level debug"
330 Say Y here if you want kernel low-level debugging support
331 on PicoXcell based platforms.
333 config DEBUG_PXA_UART1
335 bool "Use PXA UART1 for low-level debug"
337 Say Y here if you want kernel low-level debugging support
340 config DEBUG_REALVIEW_STD_PORT
341 bool "RealView Default UART"
342 depends on ARCH_REALVIEW
344 Say Y here if you want the debug print routines to direct
345 their output to the serial port on RealView EB, PB11MP, PBA8
348 config DEBUG_REALVIEW_PB1176_PORT
349 bool "RealView PB1176 UART"
350 depends on MACH_REALVIEW_PB1176
352 Say Y here if you want the debug print routines to direct
353 their output to the standard serial port on the RealView
356 config DEBUG_S3C_UART0
357 depends on PLAT_SAMSUNG
358 select DEBUG_EXYNOS_UART if ARCH_EXYNOS
359 bool "Use S3C UART 0 for low-level debug"
361 Say Y here if you want the debug print routines to direct
362 their output to UART 0. The port must have been initialised
363 by the boot-loader before use.
365 The uncompressor code port configuration is now handled
366 by CONFIG_S3C_LOWLEVEL_UART_PORT.
368 config DEBUG_S3C_UART1
369 depends on PLAT_SAMSUNG
370 select DEBUG_EXYNOS_UART if ARCH_EXYNOS
371 bool "Use S3C UART 1 for low-level debug"
373 Say Y here if you want the debug print routines to direct
374 their output to UART 1. The port must have been initialised
375 by the boot-loader before use.
377 The uncompressor code port configuration is now handled
378 by CONFIG_S3C_LOWLEVEL_UART_PORT.
380 config DEBUG_S3C_UART2
381 depends on PLAT_SAMSUNG
382 select DEBUG_EXYNOS_UART if ARCH_EXYNOS
383 bool "Use S3C UART 2 for low-level debug"
385 Say Y here if you want the debug print routines to direct
386 their output to UART 2. The port must have been initialised
387 by the boot-loader before use.
389 The uncompressor code port configuration is now handled
390 by CONFIG_S3C_LOWLEVEL_UART_PORT.
392 config DEBUG_S3C_UART3
393 depends on PLAT_SAMSUNG && ARCH_EXYNOS
394 select DEBUG_EXYNOS_UART
395 bool "Use S3C UART 3 for low-level debug"
397 Say Y here if you want the debug print routines to direct
398 their output to UART 3. The port must have been initialised
399 by the boot-loader before use.
401 The uncompressor code port configuration is now handled
402 by CONFIG_S3C_LOWLEVEL_UART_PORT.
404 config DEBUG_SOCFPGA_UART
405 depends on ARCH_SOCFPGA
406 bool "Use SOCFPGA UART for low-level debug"
408 Say Y here if you want kernel low-level debugging support
409 on SOCFPGA based platforms.
411 config DEBUG_SUNXI_UART0
412 bool "Kernel low-level debugging messages via sunXi UART0"
413 depends on ARCH_SUNXI
415 Say Y here if you want kernel low-level debugging support
416 on Allwinner A1X based platforms on the UART0.
418 config DEBUG_SUNXI_UART1
419 bool "Kernel low-level debugging messages via sunXi UART1"
420 depends on ARCH_SUNXI
422 Say Y here if you want kernel low-level debugging support
423 on Allwinner A1X based platforms on the UART1.
425 config DEBUG_TEGRA_UART
426 depends on ARCH_TEGRA
427 bool "Use Tegra UART for low-level debug"
429 Say Y here if you want kernel low-level debugging support
430 on Tegra based platforms.
432 config DEBUG_SIRFPRIMA2_UART1
433 bool "Kernel low-level debugging messages via SiRFprimaII UART1"
434 depends on ARCH_PRIMA2
436 Say Y here if you want the debug print routines to direct
437 their output to the uart1 port on SiRFprimaII devices.
439 config DEBUG_SIRFMARCO_UART1
440 bool "Kernel low-level debugging messages via SiRFmarco UART1"
441 depends on ARCH_MARCO
443 Say Y here if you want the debug print routines to direct
444 their output to the uart1 port on SiRFmarco devices.
446 config DEBUG_UX500_UART
447 depends on ARCH_U8500
448 bool "Use Ux500 UART for low-level debug"
450 Say Y here if you want kernel low-level debugging support
451 on Ux500 based platforms.
453 config DEBUG_VEXPRESS_UART0_DETECT
454 bool "Autodetect UART0 on Versatile Express Cortex-A core tiles"
455 depends on ARCH_VEXPRESS && CPU_CP15_MMU
457 This option enables a simple heuristic which tries to determine
458 the motherboard's memory map variant (original or RS1) and then
459 choose the relevant UART0 base address.
461 Note that this will only work with standard A-class core tiles,
462 and may fail with non-standard SMM or custom software models.
464 config DEBUG_VEXPRESS_UART0_CA9
465 bool "Use PL011 UART0 at 0x10009000 (V2P-CA9 core tile)"
466 depends on ARCH_VEXPRESS
468 This option selects UART0 at 0x10009000. Except for custom models,
469 this applies only to the V2P-CA9 tile.
471 config DEBUG_VEXPRESS_UART0_RS1
472 bool "Use PL011 UART0 at 0x1c090000 (RS1 complaint tiles)"
473 depends on ARCH_VEXPRESS
475 This option selects UART0 at 0x1c090000. This applies to most
476 of the tiles using the RS1 memory map, including all new A-class
477 core tiles, FPGA-based SMMs and software models.
479 config DEBUG_VT8500_UART0
480 bool "Use UART0 on VIA/Wondermedia SoCs"
481 depends on ARCH_VT8500
483 This option selects UART0 on VIA/Wondermedia System-on-a-chip
484 devices, including VT8500, WM8505, WM8650 and WM8850.
486 config DEBUG_STI_UART
488 bool "Use StiH415/416 ASC for low-level debug"
490 Say Y here if you want kernel low-level debugging support
491 on StiH415/416 based platforms like B2000, B2020.
492 It support UART2 and SBC_UART1.
496 config DEBUG_LL_UART_NONE
497 bool "No low-level debugging UART"
498 depends on !ARCH_MULTIPLATFORM
500 Say Y here if your platform doesn't provide a UART option
501 below. This relies on your platform choosing the right UART
502 definition internally in order for low-level debugging to
506 bool "Kernel low-level debugging via EmbeddedICE DCC channel"
508 Say Y here if you want the debug print routines to direct
509 their output to the EmbeddedICE macrocell's DCC channel using
510 co-processor 14. This is known to work on the ARM9 style ICE
511 channel and on the XScale with the PEEDI.
513 Note that the system will appear to hang during boot if there
514 is nothing connected to read from the DCC.
516 config DEBUG_SEMIHOSTING
517 bool "Kernel low-level debug output via semihosting I/O"
519 Semihosting enables code running on an ARM target to use
520 the I/O facilities on a host debugger/emulator through a
521 simple SVC call. The host debugger or emulator must have
522 semihosting enabled for the special svc call to be trapped
523 otherwise the kernel will crash.
525 This is known to work with OpenOCD, as well as
526 ARM's Fast Models, or any other controlling environment
527 that implements semihosting.
529 For more details about semihosting, please see
530 chapter 8 of DUI0203I_rvct_developer_guide.pdf from ARM Ltd.
534 config DEBUG_EXYNOS_UART
537 config DEBUG_IMX_UART_PORT
538 int "i.MX Debug UART Port Selection" if DEBUG_IMX1_UART || \
539 DEBUG_IMX25_UART || \
540 DEBUG_IMX21_IMX27_UART || \
541 DEBUG_IMX31_UART || \
542 DEBUG_IMX35_UART || \
543 DEBUG_IMX51_UART || \
544 DEBUG_IMX53_UART || \
549 Choose UART port on which kernel low-level debug messages
553 prompt "Low-level debug console UART"
554 depends on DEBUG_OMAP2PLUS_UART
556 config DEBUG_OMAP2UART1
557 bool "OMAP2/3/4 UART1 (omap2/3 sdp boards and some omap3 boards)"
559 This covers at least h4, 2430sdp, 3430sdp, 3630sdp,
560 omap3 torpedo and 3530 lv som.
562 config DEBUG_OMAP2UART2
563 bool "OMAP2/3/4 UART2"
565 config DEBUG_OMAP2UART3
566 bool "OMAP2 UART3 (n8x0)"
568 config DEBUG_OMAP3UART3
569 bool "OMAP3 UART3 (most omap3 boards)"
571 This covers at least cm_t3x, beagle, crane, devkit8000,
572 igep00x0, ldp, n900, n9(50), pandora, overo, touchbook,
575 config DEBUG_OMAP4UART3
576 bool "OMAP4/5 UART3 (omap4 blaze, panda, omap5 sevm)"
578 config DEBUG_OMAP3UART4
579 bool "OMAP36XX UART4"
581 config DEBUG_OMAP4UART4
584 config DEBUG_TI81XXUART1
585 bool "TI81XX UART1 (ti8148evm)"
587 config DEBUG_TI81XXUART2
590 config DEBUG_TI81XXUART3
591 bool "TI81XX UART3 (ti8168evm)"
593 config DEBUG_AM33XXUART1
596 config DEBUG_ZOOM_UART
601 prompt "Low-level debug console UART"
602 depends on DEBUG_LL && DEBUG_TEGRA_UART
604 config TEGRA_DEBUG_UART_AUTO_ODMDATA
607 Automatically determines which UART to use for low-level debug based
608 on the ODMDATA value. This value is part of the BCT, and is written
609 to the boot memory device using nvflash, or other flashing tool.
610 When bits 19:18 are 3, then bits 17:15 indicate which UART to use;
611 0/1/2/3/4 are UART A/B/C/D/E.
613 config TEGRA_DEBUG_UARTA
616 config TEGRA_DEBUG_UARTB
619 config TEGRA_DEBUG_UARTC
622 config TEGRA_DEBUG_UARTD
625 config TEGRA_DEBUG_UARTE
631 prompt "Low-level debug console UART"
632 depends on DEBUG_LL && DEBUG_STI_UART
634 config STIH41X_DEBUG_ASC2
637 Say Y here if you want kernel low-level debugging support
638 on STiH415/416 based platforms like b2000, which has
639 default UART wired up to ASC2.
643 config STIH41X_DEBUG_SBC_ASC1
646 Say Y here if you want kernel low-level debugging support
647 on STiH415/416 based platforms like b2020. which has
648 default UART wired up to SBC ASC1.
654 config DEBUG_LL_INCLUDE
656 default "debug/bcm2835.S" if DEBUG_BCM2835
657 default "debug/cns3xxx.S" if DEBUG_CNS3XXX
658 default "debug/exynos.S" if DEBUG_EXYNOS_UART
659 default "debug/highbank.S" if DEBUG_HIGHBANK_UART
660 default "debug/icedcc.S" if DEBUG_ICEDCC
661 default "debug/imx.S" if DEBUG_IMX1_UART || \
662 DEBUG_IMX25_UART || \
663 DEBUG_IMX21_IMX27_UART || \
664 DEBUG_IMX31_UART || \
665 DEBUG_IMX35_UART || \
666 DEBUG_IMX51_UART || \
669 default "debug/mvebu.S" if DEBUG_MVEBU_UART
670 default "debug/mxs.S" if DEBUG_IMX23_UART || DEBUG_IMX28_UART
671 default "debug/nomadik.S" if DEBUG_NOMADIK_UART
672 default "debug/omap2plus.S" if DEBUG_OMAP2PLUS_UART
673 default "debug/picoxcell.S" if DEBUG_PICOXCELL_UART
674 default "debug/pxa.S" if DEBUG_PXA_UART1 || DEBUG_MMP_UART2 || \
676 default "debug/sirf.S" if DEBUG_SIRFPRIMA2_UART1 || DEBUG_SIRFMARCO_UART1
677 default "debug/socfpga.S" if DEBUG_SOCFPGA_UART
678 default "debug/sti.S" if DEBUG_STI_UART
679 default "debug/sunxi.S" if DEBUG_SUNXI_UART0 || DEBUG_SUNXI_UART1
680 default "debug/tegra.S" if DEBUG_TEGRA_UART
681 default "debug/ux500.S" if DEBUG_UX500_UART
682 default "debug/vexpress.S" if DEBUG_VEXPRESS_UART0_DETECT || \
683 DEBUG_VEXPRESS_UART0_CA9 || DEBUG_VEXPRESS_UART0_RS1
684 default "debug/vt8500.S" if DEBUG_VT8500_UART0
685 default "debug/zynq.S" if DEBUG_ZYNQ_UART0 || DEBUG_ZYNQ_UART1
686 default "mach/debug-macro.S"
688 config DEBUG_UNCOMPRESS
690 default y if ARCH_MULTIPLATFORM && DEBUG_LL && \
691 !DEBUG_OMAP2PLUS_UART && \
694 config UNCOMPRESS_INCLUDE
696 default "debug/uncompress.h" if ARCH_MULTIPLATFORM
697 default "mach/uncompress.h"
703 Say Y here if you want to have an early console using the
704 kernel low-level debugging functions. Add earlyprintk to your
705 kernel parameters to enable this console.
708 bool "On-chip ETM and ETB"
711 Enables the on-chip embedded trace macrocell and embedded trace
712 buffer driver that will allow you to collect traces of the
715 config ARM_KPROBES_TEST
716 tristate "Kprobes test module"
717 depends on KPROBES && MODULES
719 Perform tests of kprobes API and instruction set simulation.
721 config PID_IN_CONTEXTIDR
722 bool "Write the current PID to the CONTEXTIDR register"
723 depends on CPU_COPY_V6
725 Enabling this option causes the kernel to write the current PID to
726 the PROCID field of the CONTEXTIDR register, at the expense of some
727 additional instructions during context switch. Say Y here only if you
728 are planning to use hardware trace tools with this kernel.