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
92 config DEBUG_CLPS711X_UART1
93 bool "Kernel low-level debugging messages via UART1"
94 depends on ARCH_CLPS711X
96 Say Y here if you want the debug print routines to direct
97 their output to the first serial port on these devices.
99 config DEBUG_CLPS711X_UART2
100 bool "Kernel low-level debugging messages via UART2"
101 depends on ARCH_CLPS711X
103 Say Y here if you want the debug print routines to direct
104 their output to the second serial port on these devices.
106 config DEBUG_DAVINCI_DA8XX_UART1
107 bool "Kernel low-level debugging on DaVinci DA8XX using UART1"
108 depends on ARCH_DAVINCI_DA8XX
110 Say Y here if you want the debug print routines to direct
111 their output to UART1 serial port on DaVinci DA8XX devices.
113 config DEBUG_DAVINCI_DA8XX_UART2
114 bool "Kernel low-level debugging on DaVinci DA8XX using UART2"
115 depends on ARCH_DAVINCI_DA8XX
117 Say Y here if you want the debug print routines to direct
118 their output to UART2 serial port on DaVinci DA8XX devices.
120 config DEBUG_DAVINCI_DMx_UART0
121 bool "Kernel low-level debugging on DaVinci DMx using UART0"
122 depends on ARCH_DAVINCI_DMx
124 Say Y here if you want the debug print routines to direct
125 their output to UART0 serial port on DaVinci DMx devices.
127 config DEBUG_DAVINCI_TNETV107X_UART1
128 bool "Kernel low-level debugging on DaVinci TNETV107x using UART1"
129 depends on ARCH_DAVINCI_TNETV107X
131 Say Y here if you want the debug print routines to direct
132 their output to UART1 serial port on DaVinci TNETV107X
135 config DEBUG_ZYNQ_UART0
136 bool "Kernel low-level debugging on Xilinx Zynq using UART0"
139 Say Y here if you want the debug print routines to direct
140 their output to UART0 on the Zynq platform.
142 config DEBUG_ZYNQ_UART1
143 bool "Kernel low-level debugging on Xilinx Zynq using UART1"
146 Say Y here if you want the debug print routines to direct
147 their output to UART1 on the Zynq platform.
149 If you have a ZC702 board and want early boot messages to
150 appear on the USB serial adaptor, select this option.
152 config DEBUG_DC21285_PORT
153 bool "Kernel low-level debugging messages via footbridge serial port"
154 depends on FOOTBRIDGE
156 Say Y here if you want the debug print routines to direct
157 their output to the serial port in the DC21285 (Footbridge).
159 config DEBUG_FOOTBRIDGE_COM1
160 bool "Kernel low-level debugging messages via footbridge 8250 at PCI COM1"
161 depends on FOOTBRIDGE
163 Say Y here if you want the debug print routines to direct
164 their output to the 8250 at PCI COM1.
166 config DEBUG_HIGHBANK_UART
167 bool "Kernel low-level debugging messages via Highbank UART"
168 depends on ARCH_HIGHBANK
170 Say Y here if you want the debug print routines to direct
171 their output to the UART on Highbank based devices.
173 config DEBUG_IMX1_UART
174 bool "i.MX1 Debug UART"
177 Say Y here if you want kernel low-level debugging support
180 config DEBUG_IMX23_UART
181 bool "i.MX23 Debug UART"
184 Say Y here if you want kernel low-level debugging support
187 config DEBUG_IMX25_UART
188 bool "i.MX25 Debug UART"
191 Say Y here if you want kernel low-level debugging support
194 config DEBUG_IMX21_IMX27_UART
195 bool "i.MX21 and i.MX27 Debug UART"
196 depends on SOC_IMX21 || SOC_IMX27
198 Say Y here if you want kernel low-level debugging support
201 config DEBUG_IMX28_UART
202 bool "i.MX28 Debug UART"
205 Say Y here if you want kernel low-level debugging support
208 config DEBUG_IMX31_UART
209 bool "i.MX31 Debug UART"
212 Say Y here if you want kernel low-level debugging support
215 config DEBUG_IMX35_UART
216 bool "i.MX35 Debug UART"
219 Say Y here if you want kernel low-level debugging support
222 config DEBUG_IMX51_UART
223 bool "i.MX51 Debug UART"
226 Say Y here if you want kernel low-level debugging support
229 config DEBUG_IMX53_UART
230 bool "i.MX53 Debug UART"
233 Say Y here if you want kernel low-level debugging support
236 config DEBUG_IMX6Q_UART
237 bool "i.MX6Q Debug UART"
240 Say Y here if you want kernel low-level debugging support
243 config DEBUG_MMP_UART2
244 bool "Kernel low-level debugging message via MMP UART2"
247 Say Y here if you want kernel low-level debugging support
250 config DEBUG_MMP_UART3
251 bool "Kernel low-level debugging message via MMP UART3"
254 Say Y here if you want kernel low-level debugging support
257 config DEBUG_MSM_UART1
258 bool "Kernel low-level debugging messages via MSM UART1"
259 depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50
261 Say Y here if you want the debug print routines to direct
262 their output to the first serial port on MSM devices.
264 config DEBUG_MSM_UART2
265 bool "Kernel low-level debugging messages via MSM UART2"
266 depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50
268 Say Y here if you want the debug print routines to direct
269 their output to the second serial port on MSM devices.
271 config DEBUG_MSM_UART3
272 bool "Kernel low-level debugging messages via MSM UART3"
273 depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50
275 Say Y here if you want the debug print routines to direct
276 their output to the third serial port on MSM devices.
278 config DEBUG_MSM8660_UART
279 bool "Kernel low-level debugging messages via MSM 8660 UART"
280 depends on ARCH_MSM8X60
281 select MSM_HAS_DEBUG_UART_HS
283 Say Y here if you want the debug print routines to direct
284 their output to the serial port on MSM 8660 devices.
286 config DEBUG_MSM8960_UART
287 bool "Kernel low-level debugging messages via MSM 8960 UART"
288 depends on ARCH_MSM8960
289 select MSM_HAS_DEBUG_UART_HS
291 Say Y here if you want the debug print routines to direct
292 their output to the serial port on MSM 8960 devices.
294 config DEBUG_MVEBU_UART
295 bool "Kernel low-level debugging messages via MVEBU UART"
296 depends on ARCH_MVEBU
298 Say Y here if you want kernel low-level debugging support
299 on MVEBU based platforms.
301 config DEBUG_OMAP2PLUS_UART
302 bool "Kernel low-level debugging messages via OMAP2PLUS UART"
303 depends on ARCH_OMAP2PLUS
305 Say Y here if you want kernel low-level debugging support
306 on OMAP2PLUS based platforms.
308 config DEBUG_PICOXCELL_UART
309 depends on ARCH_PICOXCELL
310 bool "Use PicoXcell UART for low-level debug"
312 Say Y here if you want kernel low-level debugging support
313 on PicoXcell based platforms.
315 config DEBUG_PXA_UART1
317 bool "Use PXA UART1 for low-level debug"
319 Say Y here if you want kernel low-level debugging support
322 config DEBUG_REALVIEW_STD_PORT
323 bool "RealView Default UART"
324 depends on ARCH_REALVIEW
326 Say Y here if you want the debug print routines to direct
327 their output to the serial port on RealView EB, PB11MP, PBA8
330 config DEBUG_REALVIEW_PB1176_PORT
331 bool "RealView PB1176 UART"
332 depends on MACH_REALVIEW_PB1176
334 Say Y here if you want the debug print routines to direct
335 their output to the standard serial port on the RealView
338 config DEBUG_S3C_UART0
339 depends on PLAT_SAMSUNG
340 bool "Use S3C UART 0 for low-level debug"
342 Say Y here if you want the debug print routines to direct
343 their output to UART 0. The port must have been initialised
344 by the boot-loader before use.
346 The uncompressor code port configuration is now handled
347 by CONFIG_S3C_LOWLEVEL_UART_PORT.
349 config DEBUG_S3C_UART1
350 depends on PLAT_SAMSUNG
351 bool "Use S3C UART 1 for low-level debug"
353 Say Y here if you want the debug print routines to direct
354 their output to UART 1. The port must have been initialised
355 by the boot-loader before use.
357 The uncompressor code port configuration is now handled
358 by CONFIG_S3C_LOWLEVEL_UART_PORT.
360 config DEBUG_S3C_UART2
361 depends on PLAT_SAMSUNG
362 bool "Use S3C UART 2 for low-level debug"
364 Say Y here if you want the debug print routines to direct
365 their output to UART 2. The port must have been initialised
366 by the boot-loader before use.
368 The uncompressor code port configuration is now handled
369 by CONFIG_S3C_LOWLEVEL_UART_PORT.
371 config DEBUG_S3C_UART3
372 depends on PLAT_SAMSUNG && ARCH_EXYNOS
373 bool "Use S3C UART 3 for low-level debug"
375 Say Y here if you want the debug print routines to direct
376 their output to UART 3. The port must have been initialised
377 by the boot-loader before use.
379 The uncompressor code port configuration is now handled
380 by CONFIG_S3C_LOWLEVEL_UART_PORT.
382 config DEBUG_SOCFPGA_UART
383 depends on ARCH_SOCFPGA
384 bool "Use SOCFPGA UART for low-level debug"
386 Say Y here if you want kernel low-level debugging support
387 on SOCFPGA based platforms.
389 config DEBUG_SUNXI_UART0
390 bool "Kernel low-level debugging messages via sunXi UART0"
391 depends on ARCH_SUNXI
393 Say Y here if you want kernel low-level debugging support
394 on Allwinner A1X based platforms on the UART0.
396 config DEBUG_SUNXI_UART1
397 bool "Kernel low-level debugging messages via sunXi UART1"
398 depends on ARCH_SUNXI
400 Say Y here if you want kernel low-level debugging support
401 on Allwinner A1X based platforms on the UART1.
403 config DEBUG_TEGRA_UART
404 depends on ARCH_TEGRA
405 bool "Use Tegra UART for low-level debug"
407 Say Y here if you want kernel low-level debugging support
408 on Tegra based platforms.
410 config DEBUG_SIRFPRIMA2_UART1
411 bool "Kernel low-level debugging messages via SiRFprimaII UART1"
412 depends on ARCH_PRIMA2
414 Say Y here if you want the debug print routines to direct
415 their output to the uart1 port on SiRFprimaII devices.
417 config DEBUG_SIRFMARCO_UART1
418 bool "Kernel low-level debugging messages via SiRFmarco UART1"
419 depends on ARCH_MARCO
421 Say Y here if you want the debug print routines to direct
422 their output to the uart1 port on SiRFmarco devices.
424 config DEBUG_VEXPRESS_UART0_DETECT
425 bool "Autodetect UART0 on Versatile Express Cortex-A core tiles"
426 depends on ARCH_VEXPRESS && CPU_CP15_MMU
428 This option enables a simple heuristic which tries to determine
429 the motherboard's memory map variant (original or RS1) and then
430 choose the relevant UART0 base address.
432 Note that this will only work with standard A-class core tiles,
433 and may fail with non-standard SMM or custom software models.
435 config DEBUG_VEXPRESS_UART0_CA9
436 bool "Use PL011 UART0 at 0x10009000 (V2P-CA9 core tile)"
437 depends on ARCH_VEXPRESS
439 This option selects UART0 at 0x10009000. Except for custom models,
440 this applies only to the V2P-CA9 tile.
442 config DEBUG_VEXPRESS_UART0_RS1
443 bool "Use PL011 UART0 at 0x1c090000 (RS1 complaint tiles)"
444 depends on ARCH_VEXPRESS
446 This option selects UART0 at 0x1c090000. This applies to most
447 of the tiles using the RS1 memory map, including all new A-class
448 core tiles, FPGA-based SMMs and software models.
450 config DEBUG_VT8500_UART0
451 bool "Use UART0 on VIA/Wondermedia SoCs"
452 depends on ARCH_VT8500
454 This option selects UART0 on VIA/Wondermedia System-on-a-chip
455 devices, including VT8500, WM8505, WM8650 and WM8850.
457 config DEBUG_LL_UART_NONE
458 bool "No low-level debugging UART"
459 depends on !ARCH_MULTIPLATFORM
461 Say Y here if your platform doesn't provide a UART option
462 below. This relies on your platform choosing the right UART
463 definition internally in order for low-level debugging to
467 bool "Kernel low-level debugging via EmbeddedICE DCC channel"
469 Say Y here if you want the debug print routines to direct
470 their output to the EmbeddedICE macrocell's DCC channel using
471 co-processor 14. This is known to work on the ARM9 style ICE
472 channel and on the XScale with the PEEDI.
474 Note that the system will appear to hang during boot if there
475 is nothing connected to read from the DCC.
477 config DEBUG_SEMIHOSTING
478 bool "Kernel low-level debug output via semihosting I/O"
480 Semihosting enables code running on an ARM target to use
481 the I/O facilities on a host debugger/emulator through a
482 simple SVC call. The host debugger or emulator must have
483 semihosting enabled for the special svc call to be trapped
484 otherwise the kernel will crash.
486 This is known to work with OpenOCD, as well as
487 ARM's Fast Models, or any other controlling environment
488 that implements semihosting.
490 For more details about semihosting, please see
491 chapter 8 of DUI0203I_rvct_developer_guide.pdf from ARM Ltd.
495 config DEBUG_IMX_UART_PORT
496 int "i.MX Debug UART Port Selection" if DEBUG_IMX1_UART || \
497 DEBUG_IMX25_UART || \
498 DEBUG_IMX21_IMX27_UART || \
499 DEBUG_IMX31_UART || \
500 DEBUG_IMX35_UART || \
501 DEBUG_IMX51_UART || \
502 DEBUG_IMX53_UART || \
507 Choose UART port on which kernel low-level debug messages
511 prompt "Low-level debug console UART"
512 depends on DEBUG_OMAP2PLUS_UART
514 config DEBUG_OMAP2UART1
515 bool "OMAP2/3/4 UART1 (omap2/3 sdp boards and some omap3 boards)"
517 This covers at least h4, 2430sdp, 3430sdp, 3630sdp,
518 omap3 torpedo and 3530 lv som.
520 config DEBUG_OMAP2UART2
521 bool "OMAP2/3/4 UART2"
523 config DEBUG_OMAP2UART3
524 bool "OMAP2 UART3 (n8x0)"
526 config DEBUG_OMAP3UART3
527 bool "OMAP3 UART3 (most omap3 boards)"
529 This covers at least cm_t3x, beagle, crane, devkit8000,
530 igep00x0, ldp, n900, n9(50), pandora, overo, touchbook,
533 config DEBUG_OMAP4UART3
534 bool "OMAP4/5 UART3 (omap4 blaze, panda, omap5 sevm)"
536 config DEBUG_OMAP3UART4
537 bool "OMAP36XX UART4"
539 config DEBUG_OMAP4UART4
542 config DEBUG_TI81XXUART1
543 bool "TI81XX UART1 (ti8148evm)"
545 config DEBUG_TI81XXUART2
548 config DEBUG_TI81XXUART3
549 bool "TI81XX UART3 (ti8168evm)"
551 config DEBUG_AM33XXUART1
554 config DEBUG_ZOOM_UART
559 prompt "Low-level debug console UART"
560 depends on DEBUG_LL && DEBUG_TEGRA_UART
562 config TEGRA_DEBUG_UART_AUTO_ODMDATA
565 Automatically determines which UART to use for low-level debug based
566 on the ODMDATA value. This value is part of the BCT, and is written
567 to the boot memory device using nvflash, or other flashing tool.
568 When bits 19:18 are 3, then bits 17:15 indicate which UART to use;
569 0/1/2/3/4 are UART A/B/C/D/E.
571 config TEGRA_DEBUG_UARTA
574 config TEGRA_DEBUG_UARTB
577 config TEGRA_DEBUG_UARTC
580 config TEGRA_DEBUG_UARTD
583 config TEGRA_DEBUG_UARTE
588 config DEBUG_LL_INCLUDE
590 default "debug/icedcc.S" if DEBUG_ICEDCC
591 default "debug/imx.S" if DEBUG_IMX1_UART || \
592 DEBUG_IMX25_UART || \
593 DEBUG_IMX21_IMX27_UART || \
594 DEBUG_IMX31_UART || \
595 DEBUG_IMX35_UART || \
596 DEBUG_IMX51_UART || \
599 default "debug/highbank.S" if DEBUG_HIGHBANK_UART
600 default "debug/mvebu.S" if DEBUG_MVEBU_UART
601 default "debug/omap2plus.S" if DEBUG_OMAP2PLUS_UART
602 default "debug/picoxcell.S" if DEBUG_PICOXCELL_UART
603 default "debug/pxa.S" if DEBUG_PXA_UART1 || DEBUG_MMP_UART2 || \
605 default "debug/socfpga.S" if DEBUG_SOCFPGA_UART
606 default "debug/sunxi.S" if DEBUG_SUNXI_UART0 || DEBUG_SUNXI_UART1
607 default "debug/vexpress.S" if DEBUG_VEXPRESS_UART0_DETECT || \
608 DEBUG_VEXPRESS_UART0_CA9 || DEBUG_VEXPRESS_UART0_RS1
609 default "debug/vt8500.S" if DEBUG_VT8500_UART0
610 default "debug/tegra.S" if DEBUG_TEGRA_UART
611 default "debug/zynq.S" if DEBUG_ZYNQ_UART0 || DEBUG_ZYNQ_UART1
612 default "mach/debug-macro.S"
618 Say Y here if you want to have an early console using the
619 kernel low-level debugging functions. Add earlyprintk to your
620 kernel parameters to enable this console.
623 bool "On-chip ETM and ETB"
626 Enables the on-chip embedded trace macrocell and embedded trace
627 buffer driver that will allow you to collect traces of the
630 config ARM_KPROBES_TEST
631 tristate "Kprobes test module"
632 depends on KPROBES && MODULES
634 Perform tests of kprobes API and instruction set simulation.
636 config PID_IN_CONTEXTIDR
637 bool "Write the current PID to the CONTEXTIDR register"
638 depends on CPU_COPY_V6
640 Enabling this option causes the kernel to write the current PID to
641 the PROCID field of the CONTEXTIDR register, at the expense of some
642 additional instructions during context switch. Say Y here only if you
643 are planning to use hardware trace tools with this kernel.