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_IMX6SL_UART
255 bool "i.MX6SL Debug UART"
256 depends on SOC_IMX6SL
258 Say Y here if you want kernel low-level debugging support
261 config DEBUG_MMP_UART2
262 bool "Kernel low-level debugging message via MMP UART2"
265 Say Y here if you want kernel low-level debugging support
268 config DEBUG_MMP_UART3
269 bool "Kernel low-level debugging message via MMP UART3"
272 Say Y here if you want kernel low-level debugging support
275 config DEBUG_MSM_UART1
276 bool "Kernel low-level debugging messages via MSM UART1"
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 first serial port on MSM devices.
282 config DEBUG_MSM_UART2
283 bool "Kernel low-level debugging messages via MSM UART2"
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 second serial port on MSM devices.
289 config DEBUG_MSM_UART3
290 bool "Kernel low-level debugging messages via MSM UART3"
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 third serial port on MSM devices.
296 config DEBUG_MSM8660_UART
297 bool "Kernel low-level debugging messages via MSM 8660 UART"
298 depends on ARCH_MSM8X60
299 select MSM_HAS_DEBUG_UART_HS
301 Say Y here if you want the debug print routines to direct
302 their output to the serial port on MSM 8660 devices.
304 config DEBUG_MSM8960_UART
305 bool "Kernel low-level debugging messages via MSM 8960 UART"
306 depends on ARCH_MSM8960
307 select MSM_HAS_DEBUG_UART_HS
309 Say Y here if you want the debug print routines to direct
310 their output to the serial port on MSM 8960 devices.
312 config DEBUG_MVEBU_UART
313 bool "Kernel low-level debugging messages via MVEBU UART"
314 depends on ARCH_MVEBU
316 Say Y here if you want kernel low-level debugging support
317 on MVEBU based platforms.
319 config DEBUG_NOMADIK_UART
320 bool "Kernel low-level debugging messages via NOMADIK UART"
321 depends on ARCH_NOMADIK
323 Say Y here if you want kernel low-level debugging support
324 on NOMADIK based platforms.
326 config DEBUG_OMAP2PLUS_UART
327 bool "Kernel low-level debugging messages via OMAP2PLUS UART"
328 depends on ARCH_OMAP2PLUS
330 Say Y here if you want kernel low-level debugging support
331 on OMAP2PLUS based platforms.
333 config DEBUG_PICOXCELL_UART
334 depends on ARCH_PICOXCELL
335 bool "Use PicoXcell UART for low-level debug"
337 Say Y here if you want kernel low-level debugging support
338 on PicoXcell based platforms.
340 config DEBUG_PXA_UART1
342 bool "Use PXA UART1 for low-level debug"
344 Say Y here if you want kernel low-level debugging support
347 config DEBUG_REALVIEW_STD_PORT
348 bool "RealView Default UART"
349 depends on ARCH_REALVIEW
351 Say Y here if you want the debug print routines to direct
352 their output to the serial port on RealView EB, PB11MP, PBA8
355 config DEBUG_REALVIEW_PB1176_PORT
356 bool "RealView PB1176 UART"
357 depends on MACH_REALVIEW_PB1176
359 Say Y here if you want the debug print routines to direct
360 their output to the standard serial port on the RealView
363 config DEBUG_S3C_UART0
364 depends on PLAT_SAMSUNG
365 select DEBUG_EXYNOS_UART if ARCH_EXYNOS
366 bool "Use S3C UART 0 for low-level debug"
368 Say Y here if you want the debug print routines to direct
369 their output to UART 0. The port must have been initialised
370 by the boot-loader before use.
372 The uncompressor code port configuration is now handled
373 by CONFIG_S3C_LOWLEVEL_UART_PORT.
375 config DEBUG_S3C_UART1
376 depends on PLAT_SAMSUNG
377 select DEBUG_EXYNOS_UART if ARCH_EXYNOS
378 bool "Use S3C UART 1 for low-level debug"
380 Say Y here if you want the debug print routines to direct
381 their output to UART 1. The port must have been initialised
382 by the boot-loader before use.
384 The uncompressor code port configuration is now handled
385 by CONFIG_S3C_LOWLEVEL_UART_PORT.
387 config DEBUG_S3C_UART2
388 depends on PLAT_SAMSUNG
389 select DEBUG_EXYNOS_UART if ARCH_EXYNOS
390 bool "Use S3C UART 2 for low-level debug"
392 Say Y here if you want the debug print routines to direct
393 their output to UART 2. The port must have been initialised
394 by the boot-loader before use.
396 The uncompressor code port configuration is now handled
397 by CONFIG_S3C_LOWLEVEL_UART_PORT.
399 config DEBUG_S3C_UART3
400 depends on PLAT_SAMSUNG && ARCH_EXYNOS
401 select DEBUG_EXYNOS_UART
402 bool "Use S3C UART 3 for low-level debug"
404 Say Y here if you want the debug print routines to direct
405 their output to UART 3. The port must have been initialised
406 by the boot-loader before use.
408 The uncompressor code port configuration is now handled
409 by CONFIG_S3C_LOWLEVEL_UART_PORT.
411 config DEBUG_SOCFPGA_UART
412 depends on ARCH_SOCFPGA
413 bool "Use SOCFPGA UART for low-level debug"
415 Say Y here if you want kernel low-level debugging support
416 on SOCFPGA based platforms.
418 config DEBUG_SUNXI_UART0
419 bool "Kernel low-level debugging messages via sunXi UART0"
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 UART0.
425 config DEBUG_SUNXI_UART1
426 bool "Kernel low-level debugging messages via sunXi UART1"
427 depends on ARCH_SUNXI
429 Say Y here if you want kernel low-level debugging support
430 on Allwinner A1X based platforms on the UART1.
432 config DEBUG_TEGRA_UART
433 depends on ARCH_TEGRA
434 bool "Use Tegra UART for low-level debug"
436 Say Y here if you want kernel low-level debugging support
437 on Tegra based platforms.
439 config DEBUG_SIRFPRIMA2_UART1
440 bool "Kernel low-level debugging messages via SiRFprimaII UART1"
441 depends on ARCH_PRIMA2
443 Say Y here if you want the debug print routines to direct
444 their output to the uart1 port on SiRFprimaII devices.
446 config DEBUG_SIRFMARCO_UART1
447 bool "Kernel low-level debugging messages via SiRFmarco UART1"
448 depends on ARCH_MARCO
450 Say Y here if you want the debug print routines to direct
451 their output to the uart1 port on SiRFmarco devices.
453 config DEBUG_UX500_UART
454 depends on ARCH_U8500
455 bool "Use Ux500 UART for low-level debug"
457 Say Y here if you want kernel low-level debugging support
458 on Ux500 based platforms.
460 config DEBUG_VEXPRESS_UART0_DETECT
461 bool "Autodetect UART0 on Versatile Express Cortex-A core tiles"
462 depends on ARCH_VEXPRESS && CPU_CP15_MMU
464 This option enables a simple heuristic which tries to determine
465 the motherboard's memory map variant (original or RS1) and then
466 choose the relevant UART0 base address.
468 Note that this will only work with standard A-class core tiles,
469 and may fail with non-standard SMM or custom software models.
471 config DEBUG_VEXPRESS_UART0_CA9
472 bool "Use PL011 UART0 at 0x10009000 (V2P-CA9 core tile)"
473 depends on ARCH_VEXPRESS
475 This option selects UART0 at 0x10009000. Except for custom models,
476 this applies only to the V2P-CA9 tile.
478 config DEBUG_VEXPRESS_UART0_RS1
479 bool "Use PL011 UART0 at 0x1c090000 (RS1 complaint tiles)"
480 depends on ARCH_VEXPRESS
482 This option selects UART0 at 0x1c090000. This applies to most
483 of the tiles using the RS1 memory map, including all new A-class
484 core tiles, FPGA-based SMMs and software models.
486 config DEBUG_VT8500_UART0
487 bool "Use UART0 on VIA/Wondermedia SoCs"
488 depends on ARCH_VT8500
490 This option selects UART0 on VIA/Wondermedia System-on-a-chip
491 devices, including VT8500, WM8505, WM8650 and WM8850.
493 config DEBUG_LL_UART_NONE
494 bool "No low-level debugging UART"
495 depends on !ARCH_MULTIPLATFORM
497 Say Y here if your platform doesn't provide a UART option
498 below. This relies on your platform choosing the right UART
499 definition internally in order for low-level debugging to
503 bool "Kernel low-level debugging via EmbeddedICE DCC channel"
505 Say Y here if you want the debug print routines to direct
506 their output to the EmbeddedICE macrocell's DCC channel using
507 co-processor 14. This is known to work on the ARM9 style ICE
508 channel and on the XScale with the PEEDI.
510 Note that the system will appear to hang during boot if there
511 is nothing connected to read from the DCC.
513 config DEBUG_SEMIHOSTING
514 bool "Kernel low-level debug output via semihosting I/O"
516 Semihosting enables code running on an ARM target to use
517 the I/O facilities on a host debugger/emulator through a
518 simple SVC call. The host debugger or emulator must have
519 semihosting enabled for the special svc call to be trapped
520 otherwise the kernel will crash.
522 This is known to work with OpenOCD, as well as
523 ARM's Fast Models, or any other controlling environment
524 that implements semihosting.
526 For more details about semihosting, please see
527 chapter 8 of DUI0203I_rvct_developer_guide.pdf from ARM Ltd.
531 config DEBUG_EXYNOS_UART
534 config DEBUG_IMX_UART_PORT
535 int "i.MX Debug UART Port Selection" if DEBUG_IMX1_UART || \
536 DEBUG_IMX25_UART || \
537 DEBUG_IMX21_IMX27_UART || \
538 DEBUG_IMX31_UART || \
539 DEBUG_IMX35_UART || \
540 DEBUG_IMX51_UART || \
541 DEBUG_IMX53_UART || \
542 DEBUG_IMX6Q_UART || \
547 Choose UART port on which kernel low-level debug messages
551 prompt "Low-level debug console UART"
552 depends on DEBUG_OMAP2PLUS_UART
554 config DEBUG_OMAP2UART1
555 bool "OMAP2/3/4 UART1 (omap2/3 sdp boards and some omap3 boards)"
557 This covers at least h4, 2430sdp, 3430sdp, 3630sdp,
558 omap3 torpedo and 3530 lv som.
560 config DEBUG_OMAP2UART2
561 bool "OMAP2/3/4 UART2"
563 config DEBUG_OMAP2UART3
564 bool "OMAP2 UART3 (n8x0)"
566 config DEBUG_OMAP3UART3
567 bool "OMAP3 UART3 (most omap3 boards)"
569 This covers at least cm_t3x, beagle, crane, devkit8000,
570 igep00x0, ldp, n900, n9(50), pandora, overo, touchbook,
573 config DEBUG_OMAP4UART3
574 bool "OMAP4/5 UART3 (omap4 blaze, panda, omap5 sevm)"
576 config DEBUG_OMAP3UART4
577 bool "OMAP36XX UART4"
579 config DEBUG_OMAP4UART4
582 config DEBUG_TI81XXUART1
583 bool "TI81XX UART1 (ti8148evm)"
585 config DEBUG_TI81XXUART2
588 config DEBUG_TI81XXUART3
589 bool "TI81XX UART3 (ti8168evm)"
591 config DEBUG_AM33XXUART1
594 config DEBUG_ZOOM_UART
599 prompt "Low-level debug console UART"
600 depends on DEBUG_LL && DEBUG_TEGRA_UART
602 config TEGRA_DEBUG_UART_AUTO_ODMDATA
605 Automatically determines which UART to use for low-level debug based
606 on the ODMDATA value. This value is part of the BCT, and is written
607 to the boot memory device using nvflash, or other flashing tool.
608 When bits 19:18 are 3, then bits 17:15 indicate which UART to use;
609 0/1/2/3/4 are UART A/B/C/D/E.
611 config TEGRA_DEBUG_UARTA
614 config TEGRA_DEBUG_UARTB
617 config TEGRA_DEBUG_UARTC
620 config TEGRA_DEBUG_UARTD
623 config TEGRA_DEBUG_UARTE
628 config DEBUG_LL_INCLUDE
630 default "debug/bcm2835.S" if DEBUG_BCM2835
631 default "debug/cns3xxx.S" if DEBUG_CNS3XXX
632 default "debug/exynos.S" if DEBUG_EXYNOS_UART
633 default "debug/highbank.S" if DEBUG_HIGHBANK_UART
634 default "debug/icedcc.S" if DEBUG_ICEDCC
635 default "debug/imx.S" if DEBUG_IMX1_UART || \
636 DEBUG_IMX25_UART || \
637 DEBUG_IMX21_IMX27_UART || \
638 DEBUG_IMX31_UART || \
639 DEBUG_IMX35_UART || \
640 DEBUG_IMX51_UART || \
642 DEBUG_IMX6Q_UART || \
644 default "debug/mvebu.S" if DEBUG_MVEBU_UART
645 default "debug/mxs.S" if DEBUG_IMX23_UART || DEBUG_IMX28_UART
646 default "debug/nomadik.S" if DEBUG_NOMADIK_UART
647 default "debug/omap2plus.S" if DEBUG_OMAP2PLUS_UART
648 default "debug/picoxcell.S" if DEBUG_PICOXCELL_UART
649 default "debug/pxa.S" if DEBUG_PXA_UART1 || DEBUG_MMP_UART2 || \
651 default "debug/sirf.S" if DEBUG_SIRFPRIMA2_UART1 || DEBUG_SIRFMARCO_UART1
652 default "debug/socfpga.S" if DEBUG_SOCFPGA_UART
653 default "debug/sunxi.S" if DEBUG_SUNXI_UART0 || DEBUG_SUNXI_UART1
654 default "debug/tegra.S" if DEBUG_TEGRA_UART
655 default "debug/ux500.S" if DEBUG_UX500_UART
656 default "debug/vexpress.S" if DEBUG_VEXPRESS_UART0_DETECT || \
657 DEBUG_VEXPRESS_UART0_CA9 || DEBUG_VEXPRESS_UART0_RS1
658 default "debug/vt8500.S" if DEBUG_VT8500_UART0
659 default "debug/zynq.S" if DEBUG_ZYNQ_UART0 || DEBUG_ZYNQ_UART1
660 default "mach/debug-macro.S"
662 config DEBUG_UNCOMPRESS
664 default y if ARCH_MULTIPLATFORM && DEBUG_LL && \
665 !DEBUG_OMAP2PLUS_UART && \
668 config UNCOMPRESS_INCLUDE
670 default "debug/uncompress.h" if ARCH_MULTIPLATFORM
671 default "mach/uncompress.h"
677 Say Y here if you want to have an early console using the
678 kernel low-level debugging functions. Add earlyprintk to your
679 kernel parameters to enable this console.
682 bool "On-chip ETM and ETB"
685 Enables the on-chip embedded trace macrocell and embedded trace
686 buffer driver that will allow you to collect traces of the
689 config ARM_KPROBES_TEST
690 tristate "Kprobes test module"
691 depends on KPROBES && MODULES
693 Perform tests of kprobes API and instruction set simulation.
695 config PID_IN_CONTEXTIDR
696 bool "Write the current PID to the CONTEXTIDR register"
697 depends on CPU_COPY_V6
699 Enabling this option causes the kernel to write the current PID to
700 the PROCID field of the CONTEXTIDR register, at the expense of some
701 additional instructions during context switch. Say Y here only if you
702 are planning to use hardware trace tools with this kernel.