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
67 bool "Write protect kernel text section"
69 depends on DEBUG_KERNEL && MMU
71 Mark the kernel text section as write-protected in the pagetables,
72 in order to catch accidental (and incorrect) writes to such const
73 data. This will cause the size of the kernel, plus up to 4MB, to
74 be mapped as pages instead of sections, which will increase TLB
78 config DEBUG_RODATA_TEST
79 bool "Testcase for the DEBUG_RODATA feature"
80 depends on DEBUG_RODATA
83 This option enables a testcase for the DEBUG_RODATA
87 # These options are only for real kernel hackers who want to get their hands dirty.
89 bool "Kernel low-level debugging functions (read help!)"
90 depends on DEBUG_KERNEL
92 Say Y here to include definitions of printascii, printch, printhex
93 in the kernel. This is helpful if you are debugging code that
94 executes before the console is initialized.
96 Note that selecting this option will limit the kernel to a single
97 UART definition, as specified below. Attempting to boot the kernel
98 image on a different platform *will not work*, so this option should
99 not be enabled for kernels that are intended to be portable.
102 prompt "Kernel low-level debugging port"
105 config AT91_DEBUG_LL_DBGU0
106 bool "Kernel low-level debugging on rm9200, 9260/9g20, 9261/9g10 and 9rl"
107 depends on HAVE_AT91_DBGU0
109 config AT91_DEBUG_LL_DBGU1
110 bool "Kernel low-level debugging on 9263 and 9g45"
111 depends on HAVE_AT91_DBGU1
114 bool "Kernel low-level debugging on BCM2835 PL011 UART"
115 depends on ARCH_BCM2835
117 config DEBUG_CLPS711X_UART1
118 bool "Kernel low-level debugging messages via UART1"
119 depends on ARCH_CLPS711X
121 Say Y here if you want the debug print routines to direct
122 their output to the first serial port on these devices.
124 config DEBUG_CLPS711X_UART2
125 bool "Kernel low-level debugging messages via UART2"
126 depends on ARCH_CLPS711X
128 Say Y here if you want the debug print routines to direct
129 their output to the second serial port on these devices.
132 bool "Kernel Kernel low-level debugging on Cavium Networks CNS3xxx"
133 depends on ARCH_CNS3XXX
135 Say Y here if you want the debug print routines to direct
136 their output to the CNS3xxx UART0.
138 config DEBUG_DAVINCI_DA8XX_UART1
139 bool "Kernel low-level debugging on DaVinci DA8XX using UART1"
140 depends on ARCH_DAVINCI_DA8XX
142 Say Y here if you want the debug print routines to direct
143 their output to UART1 serial port on DaVinci DA8XX devices.
145 config DEBUG_DAVINCI_DA8XX_UART2
146 bool "Kernel low-level debugging on DaVinci DA8XX using UART2"
147 depends on ARCH_DAVINCI_DA8XX
149 Say Y here if you want the debug print routines to direct
150 their output to UART2 serial port on DaVinci DA8XX devices.
152 config DEBUG_DAVINCI_DMx_UART0
153 bool "Kernel low-level debugging on DaVinci DMx using UART0"
154 depends on ARCH_DAVINCI_DMx
156 Say Y here if you want the debug print routines to direct
157 their output to UART0 serial port on DaVinci DMx devices.
159 config DEBUG_DAVINCI_TNETV107X_UART1
160 bool "Kernel low-level debugging on DaVinci TNETV107x using UART1"
161 depends on ARCH_DAVINCI_TNETV107X
163 Say Y here if you want the debug print routines to direct
164 their output to UART1 serial port on DaVinci TNETV107X
167 config DEBUG_ZYNQ_UART0
168 bool "Kernel low-level debugging on Xilinx Zynq using UART0"
171 Say Y here if you want the debug print routines to direct
172 their output to UART0 on the Zynq platform.
174 config DEBUG_ZYNQ_UART1
175 bool "Kernel low-level debugging on Xilinx Zynq using UART1"
178 Say Y here if you want the debug print routines to direct
179 their output to UART1 on the Zynq platform.
181 If you have a ZC702 board and want early boot messages to
182 appear on the USB serial adaptor, select this option.
184 config DEBUG_DC21285_PORT
185 bool "Kernel low-level debugging messages via footbridge serial port"
186 depends on FOOTBRIDGE
188 Say Y here if you want the debug print routines to direct
189 their output to the serial port in the DC21285 (Footbridge).
191 config DEBUG_FOOTBRIDGE_COM1
192 bool "Kernel low-level debugging messages via footbridge 8250 at PCI COM1"
193 depends on FOOTBRIDGE
195 Say Y here if you want the debug print routines to direct
196 their output to the 8250 at PCI COM1.
198 config DEBUG_HIGHBANK_UART
199 bool "Kernel low-level debugging messages via Highbank UART"
200 depends on ARCH_HIGHBANK
202 Say Y here if you want the debug print routines to direct
203 their output to the UART on Highbank based devices.
205 config DEBUG_IMX1_UART
206 bool "i.MX1 Debug UART"
209 Say Y here if you want kernel low-level debugging support
212 config DEBUG_IMX23_UART
213 bool "i.MX23 Debug UART"
216 Say Y here if you want kernel low-level debugging support
219 config DEBUG_IMX25_UART
220 bool "i.MX25 Debug UART"
223 Say Y here if you want kernel low-level debugging support
226 config DEBUG_IMX21_IMX27_UART
227 bool "i.MX21 and i.MX27 Debug UART"
228 depends on SOC_IMX21 || SOC_IMX27
230 Say Y here if you want kernel low-level debugging support
233 config DEBUG_IMX28_UART
234 bool "i.MX28 Debug UART"
237 Say Y here if you want kernel low-level debugging support
240 config DEBUG_IMX31_UART
241 bool "i.MX31 Debug UART"
244 Say Y here if you want kernel low-level debugging support
247 config DEBUG_IMX35_UART
248 bool "i.MX35 Debug UART"
251 Say Y here if you want kernel low-level debugging support
254 config DEBUG_IMX51_UART
255 bool "i.MX51 Debug UART"
258 Say Y here if you want kernel low-level debugging support
261 config DEBUG_IMX53_UART
262 bool "i.MX53 Debug UART"
265 Say Y here if you want kernel low-level debugging support
268 config DEBUG_IMX6Q_UART
269 bool "i.MX6Q/DL Debug UART"
272 Say Y here if you want kernel low-level debugging support
275 config DEBUG_MMP_UART2
276 bool "Kernel low-level debugging message via MMP UART2"
279 Say Y here if you want kernel low-level debugging support
282 config DEBUG_MMP_UART3
283 bool "Kernel low-level debugging message via MMP UART3"
286 Say Y here if you want kernel low-level debugging support
289 config DEBUG_MSM_UART1
290 bool "Kernel low-level debugging messages via MSM UART1"
291 depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50
293 Say Y here if you want the debug print routines to direct
294 their output to the first serial port on MSM devices.
296 config DEBUG_MSM_UART2
297 bool "Kernel low-level debugging messages via MSM UART2"
298 depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50
300 Say Y here if you want the debug print routines to direct
301 their output to the second serial port on MSM devices.
303 config DEBUG_MSM_UART3
304 bool "Kernel low-level debugging messages via MSM UART3"
305 depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50
307 Say Y here if you want the debug print routines to direct
308 their output to the third serial port on MSM devices.
310 config DEBUG_MSM8660_UART
311 bool "Kernel low-level debugging messages via MSM 8660 UART"
312 depends on ARCH_MSM8X60
313 select MSM_HAS_DEBUG_UART_HS
315 Say Y here if you want the debug print routines to direct
316 their output to the serial port on MSM 8660 devices.
318 config DEBUG_MSM8960_UART
319 bool "Kernel low-level debugging messages via MSM 8960 UART"
320 depends on ARCH_MSM8960
321 select MSM_HAS_DEBUG_UART_HS
323 Say Y here if you want the debug print routines to direct
324 their output to the serial port on MSM 8960 devices.
326 config DEBUG_MVEBU_UART
327 bool "Kernel low-level debugging messages via MVEBU UART"
328 depends on ARCH_MVEBU
330 Say Y here if you want kernel low-level debugging support
331 on MVEBU based platforms.
333 config DEBUG_NOMADIK_UART
334 bool "Kernel low-level debugging messages via NOMADIK UART"
335 depends on ARCH_NOMADIK
337 Say Y here if you want kernel low-level debugging support
338 on NOMADIK based platforms.
340 config DEBUG_OMAP2PLUS_UART
341 bool "Kernel low-level debugging messages via OMAP2PLUS UART"
342 depends on ARCH_OMAP2PLUS
344 Say Y here if you want kernel low-level debugging support
345 on OMAP2PLUS based platforms.
347 config DEBUG_PICOXCELL_UART
348 depends on ARCH_PICOXCELL
349 bool "Use PicoXcell UART for low-level debug"
351 Say Y here if you want kernel low-level debugging support
352 on PicoXcell based platforms.
354 config DEBUG_PXA_UART1
356 bool "Use PXA UART1 for low-level debug"
358 Say Y here if you want kernel low-level debugging support
361 config DEBUG_REALVIEW_STD_PORT
362 bool "RealView Default UART"
363 depends on ARCH_REALVIEW
365 Say Y here if you want the debug print routines to direct
366 their output to the serial port on RealView EB, PB11MP, PBA8
369 config DEBUG_REALVIEW_PB1176_PORT
370 bool "RealView PB1176 UART"
371 depends on MACH_REALVIEW_PB1176
373 Say Y here if you want the debug print routines to direct
374 their output to the standard serial port on the RealView
377 config DEBUG_ROCKCHIP_UART
378 depends on ARCH_ROCKCHIP
379 bool "Use UART on Rockchip SoCs"
381 Say Y here if you want kernel low-level debugging support
384 config DEBUG_S3C_UART0
385 depends on PLAT_SAMSUNG
386 select DEBUG_EXYNOS_UART if ARCH_EXYNOS
387 bool "Use S3C UART 0 for low-level debug"
389 Say Y here if you want the debug print routines to direct
390 their output to UART 0. The port must have been initialised
391 by the boot-loader before use.
393 The uncompressor code port configuration is now handled
394 by CONFIG_S3C_LOWLEVEL_UART_PORT.
396 config DEBUG_S3C_UART1
397 depends on PLAT_SAMSUNG
398 select DEBUG_EXYNOS_UART if ARCH_EXYNOS
399 bool "Use S3C UART 1 for low-level debug"
401 Say Y here if you want the debug print routines to direct
402 their output to UART 1. The port must have been initialised
403 by the boot-loader before use.
405 The uncompressor code port configuration is now handled
406 by CONFIG_S3C_LOWLEVEL_UART_PORT.
408 config DEBUG_S3C_UART2
409 depends on PLAT_SAMSUNG
410 select DEBUG_EXYNOS_UART if ARCH_EXYNOS
411 bool "Use S3C UART 2 for low-level debug"
413 Say Y here if you want the debug print routines to direct
414 their output to UART 2. The port must have been initialised
415 by the boot-loader before use.
417 The uncompressor code port configuration is now handled
418 by CONFIG_S3C_LOWLEVEL_UART_PORT.
420 config DEBUG_S3C_UART3
421 depends on PLAT_SAMSUNG && ARCH_EXYNOS
422 select DEBUG_EXYNOS_UART
423 bool "Use S3C UART 3 for low-level debug"
425 Say Y here if you want the debug print routines to direct
426 their output to UART 3. The port must have been initialised
427 by the boot-loader before use.
429 The uncompressor code port configuration is now handled
430 by CONFIG_S3C_LOWLEVEL_UART_PORT.
432 config DEBUG_SOCFPGA_UART
433 depends on ARCH_SOCFPGA
434 bool "Use SOCFPGA UART for low-level debug"
436 Say Y here if you want kernel low-level debugging support
437 on SOCFPGA based platforms.
439 config DEBUG_SUNXI_UART0
440 bool "Kernel low-level debugging messages via sunXi UART0"
441 depends on ARCH_SUNXI
443 Say Y here if you want kernel low-level debugging support
444 on Allwinner A1X based platforms on the UART0.
446 config DEBUG_SUNXI_UART1
447 bool "Kernel low-level debugging messages via sunXi UART1"
448 depends on ARCH_SUNXI
450 Say Y here if you want kernel low-level debugging support
451 on Allwinner A1X based platforms on the UART1.
453 config DEBUG_TEGRA_UART
454 depends on ARCH_TEGRA
455 bool "Use Tegra UART for low-level debug"
457 Say Y here if you want kernel low-level debugging support
458 on Tegra based platforms.
460 config DEBUG_SIRFPRIMA2_UART1
461 bool "Kernel low-level debugging messages via SiRFprimaII UART1"
462 depends on ARCH_PRIMA2
464 Say Y here if you want the debug print routines to direct
465 their output to the uart1 port on SiRFprimaII devices.
467 config DEBUG_SIRFMARCO_UART1
468 bool "Kernel low-level debugging messages via SiRFmarco UART1"
469 depends on ARCH_MARCO
471 Say Y here if you want the debug print routines to direct
472 their output to the uart1 port on SiRFmarco devices.
474 config DEBUG_UX500_UART
475 depends on ARCH_U8500
476 bool "Use Ux500 UART for low-level debug"
478 Say Y here if you want kernel low-level debugging support
479 on Ux500 based platforms.
481 config DEBUG_VEXPRESS_UART0_DETECT
482 bool "Autodetect UART0 on Versatile Express Cortex-A core tiles"
483 depends on ARCH_VEXPRESS && CPU_CP15_MMU
485 This option enables a simple heuristic which tries to determine
486 the motherboard's memory map variant (original or RS1) and then
487 choose the relevant UART0 base address.
489 Note that this will only work with standard A-class core tiles,
490 and may fail with non-standard SMM or custom software models.
492 config DEBUG_VEXPRESS_UART0_CA9
493 bool "Use PL011 UART0 at 0x10009000 (V2P-CA9 core tile)"
494 depends on ARCH_VEXPRESS
496 This option selects UART0 at 0x10009000. Except for custom models,
497 this applies only to the V2P-CA9 tile.
499 config DEBUG_VEXPRESS_UART0_RS1
500 bool "Use PL011 UART0 at 0x1c090000 (RS1 complaint tiles)"
501 depends on ARCH_VEXPRESS
503 This option selects UART0 at 0x1c090000. This applies to most
504 of the tiles using the RS1 memory map, including all new A-class
505 core tiles, FPGA-based SMMs and software models.
507 config DEBUG_VT8500_UART0
508 bool "Use UART0 on VIA/Wondermedia SoCs"
509 depends on ARCH_VT8500
511 This option selects UART0 on VIA/Wondermedia System-on-a-chip
512 devices, including VT8500, WM8505, WM8650 and WM8850.
514 config DEBUG_LL_UART_NONE
515 bool "No low-level debugging UART"
516 depends on !ARCH_MULTIPLATFORM
518 Say Y here if your platform doesn't provide a UART option
519 below. This relies on your platform choosing the right UART
520 definition internally in order for low-level debugging to
524 bool "Kernel low-level debugging via EmbeddedICE DCC channel"
526 Say Y here if you want the debug print routines to direct
527 their output to the EmbeddedICE macrocell's DCC channel using
528 co-processor 14. This is known to work on the ARM9 style ICE
529 channel and on the XScale with the PEEDI.
531 Note that the system will appear to hang during boot if there
532 is nothing connected to read from the DCC.
534 config DEBUG_SEMIHOSTING
535 bool "Kernel low-level debug output via semihosting I/O"
537 Semihosting enables code running on an ARM target to use
538 the I/O facilities on a host debugger/emulator through a
539 simple SVC call. The host debugger or emulator must have
540 semihosting enabled for the special svc call to be trapped
541 otherwise the kernel will crash.
543 This is known to work with OpenOCD, as well as
544 ARM's Fast Models, or any other controlling environment
545 that implements semihosting.
547 For more details about semihosting, please see
548 chapter 8 of DUI0203I_rvct_developer_guide.pdf from ARM Ltd.
552 config DEBUG_EXYNOS_UART
555 config DEBUG_IMX_UART_PORT
556 int "i.MX Debug UART Port Selection" if DEBUG_IMX1_UART || \
557 DEBUG_IMX25_UART || \
558 DEBUG_IMX21_IMX27_UART || \
559 DEBUG_IMX31_UART || \
560 DEBUG_IMX35_UART || \
561 DEBUG_IMX51_UART || \
562 DEBUG_IMX53_UART || \
567 Choose UART port on which kernel low-level debug messages
571 prompt "Low-level debug console UART"
572 depends on DEBUG_OMAP2PLUS_UART
574 config DEBUG_OMAP2UART1
575 bool "OMAP2/3/4 UART1 (omap2/3 sdp boards and some omap3 boards)"
577 This covers at least h4, 2430sdp, 3430sdp, 3630sdp,
578 omap3 torpedo and 3530 lv som.
580 config DEBUG_OMAP2UART2
581 bool "OMAP2/3/4 UART2"
583 config DEBUG_OMAP2UART3
584 bool "OMAP2 UART3 (n8x0)"
586 config DEBUG_OMAP3UART3
587 bool "OMAP3 UART3 (most omap3 boards)"
589 This covers at least cm_t3x, beagle, crane, devkit8000,
590 igep00x0, ldp, n900, n9(50), pandora, overo, touchbook,
593 config DEBUG_OMAP4UART3
594 bool "OMAP4/5 UART3 (omap4 blaze, panda, omap5 sevm)"
596 config DEBUG_OMAP3UART4
597 bool "OMAP36XX UART4"
599 config DEBUG_OMAP4UART4
602 config DEBUG_TI81XXUART1
603 bool "TI81XX UART1 (ti8148evm)"
605 config DEBUG_TI81XXUART2
608 config DEBUG_TI81XXUART3
609 bool "TI81XX UART3 (ti8168evm)"
611 config DEBUG_AM33XXUART1
614 config DEBUG_ZOOM_UART
619 prompt "Low-level debug console UART"
620 depends on DEBUG_LL && DEBUG_TEGRA_UART
622 config TEGRA_DEBUG_UART_AUTO_ODMDATA
625 Automatically determines which UART to use for low-level debug based
626 on the ODMDATA value. This value is part of the BCT, and is written
627 to the boot memory device using nvflash, or other flashing tool.
628 When bits 19:18 are 3, then bits 17:15 indicate which UART to use;
629 0/1/2/3/4 are UART A/B/C/D/E.
631 config TEGRA_DEBUG_UARTA
634 config TEGRA_DEBUG_UARTB
637 config TEGRA_DEBUG_UARTC
640 config TEGRA_DEBUG_UARTD
643 config TEGRA_DEBUG_UARTE
648 config DEBUG_LL_INCLUDE
650 default "debug/bcm2835.S" if DEBUG_BCM2835
651 default "debug/cns3xxx.S" if DEBUG_CNS3XXX
652 default "debug/exynos.S" if DEBUG_EXYNOS_UART
653 default "debug/highbank.S" if DEBUG_HIGHBANK_UART
654 default "debug/icedcc.S" if DEBUG_ICEDCC
655 default "debug/imx.S" if DEBUG_IMX1_UART || \
656 DEBUG_IMX25_UART || \
657 DEBUG_IMX21_IMX27_UART || \
658 DEBUG_IMX31_UART || \
659 DEBUG_IMX35_UART || \
660 DEBUG_IMX51_UART || \
663 default "debug/mvebu.S" if DEBUG_MVEBU_UART
664 default "debug/mxs.S" if DEBUG_IMX23_UART || DEBUG_IMX28_UART
665 default "debug/nomadik.S" if DEBUG_NOMADIK_UART
666 default "debug/omap2plus.S" if DEBUG_OMAP2PLUS_UART
667 default "debug/picoxcell.S" if DEBUG_PICOXCELL_UART
668 default "debug/pxa.S" if DEBUG_PXA_UART1 || DEBUG_MMP_UART2 || \
670 default "debug/rockchip.S" if DEBUG_ROCKCHIP_UART
671 default "debug/sirf.S" if DEBUG_SIRFPRIMA2_UART1 || DEBUG_SIRFMARCO_UART1
672 default "debug/socfpga.S" if DEBUG_SOCFPGA_UART
673 default "debug/sunxi.S" if DEBUG_SUNXI_UART0 || DEBUG_SUNXI_UART1
674 default "debug/tegra.S" if DEBUG_TEGRA_UART
675 default "debug/ux500.S" if DEBUG_UX500_UART
676 default "debug/vexpress.S" if DEBUG_VEXPRESS_UART0_DETECT || \
677 DEBUG_VEXPRESS_UART0_CA9 || DEBUG_VEXPRESS_UART0_RS1
678 default "debug/vt8500.S" if DEBUG_VT8500_UART0
679 default "debug/zynq.S" if DEBUG_ZYNQ_UART0 || DEBUG_ZYNQ_UART1
680 default "mach/debug-macro.S"
682 config DEBUG_UNCOMPRESS
684 default y if ARCH_MULTIPLATFORM && DEBUG_LL && \
685 !DEBUG_OMAP2PLUS_UART && \
688 config UNCOMPRESS_INCLUDE
690 default "debug/uncompress.h" if ARCH_MULTIPLATFORM
691 default "mach/uncompress.h"
697 Say Y here if you want to have an early console using the
698 kernel low-level debugging functions. Add earlyprintk to your
699 kernel parameters to enable this console.
701 config EARLY_PRINTK_DIRECT
702 bool "Early printk direct"
705 Say Y here if you want to have an early console using the
706 kernel low-level debugging functions and EARLY_PRINTK is
710 bool "On-chip ETM and ETB"
713 Enables the on-chip embedded trace macrocell and embedded trace
714 buffer driver that will allow you to collect traces of the
717 config ARM_KPROBES_TEST
718 tristate "Kprobes test module"
719 depends on KPROBES && MODULES
721 Perform tests of kprobes API and instruction set simulation.
723 config PID_IN_CONTEXTIDR
724 bool "Write the current PID to the CONTEXTIDR register"
725 depends on CPU_COPY_V6
727 Enabling this option causes the kernel to write the current PID to
728 the PROCID field of the CONTEXTIDR register, at the expense of some
729 additional instructions during context switch. Say Y here only if you
730 are planning to use hardware trace tools with this kernel.