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.
110 config DEBUG_DAVINCI_DA8XX_UART1
111 bool "Kernel low-level debugging on DaVinci DA8XX using UART1"
112 depends on ARCH_DAVINCI_DA8XX
114 Say Y here if you want the debug print routines to direct
115 their output to UART1 serial port on DaVinci DA8XX devices.
117 config DEBUG_DAVINCI_DA8XX_UART2
118 bool "Kernel low-level debugging on DaVinci DA8XX using UART2"
119 depends on ARCH_DAVINCI_DA8XX
121 Say Y here if you want the debug print routines to direct
122 their output to UART2 serial port on DaVinci DA8XX devices.
124 config DEBUG_DAVINCI_DMx_UART0
125 bool "Kernel low-level debugging on DaVinci DMx using UART0"
126 depends on ARCH_DAVINCI_DMx
128 Say Y here if you want the debug print routines to direct
129 their output to UART0 serial port on DaVinci DMx devices.
131 config DEBUG_DAVINCI_TNETV107X_UART1
132 bool "Kernel low-level debugging on DaVinci TNETV107x using UART1"
133 depends on ARCH_DAVINCI_TNETV107X
135 Say Y here if you want the debug print routines to direct
136 their output to UART1 serial port on DaVinci TNETV107X
139 config DEBUG_ZYNQ_UART0
140 bool "Kernel low-level debugging on Xilinx Zynq using UART0"
143 Say Y here if you want the debug print routines to direct
144 their output to UART0 on the Zynq platform.
146 config DEBUG_ZYNQ_UART1
147 bool "Kernel low-level debugging on Xilinx Zynq using UART1"
150 Say Y here if you want the debug print routines to direct
151 their output to UART1 on the Zynq platform.
153 If you have a ZC702 board and want early boot messages to
154 appear on the USB serial adaptor, select this option.
156 config DEBUG_DC21285_PORT
157 bool "Kernel low-level debugging messages via footbridge serial port"
158 depends on FOOTBRIDGE
160 Say Y here if you want the debug print routines to direct
161 their output to the serial port in the DC21285 (Footbridge).
163 config DEBUG_FOOTBRIDGE_COM1
164 bool "Kernel low-level debugging messages via footbridge 8250 at PCI COM1"
165 depends on FOOTBRIDGE
167 Say Y here if you want the debug print routines to direct
168 their output to the 8250 at PCI COM1.
170 config DEBUG_HIGHBANK_UART
171 bool "Kernel low-level debugging messages via Highbank UART"
172 depends on ARCH_HIGHBANK
174 Say Y here if you want the debug print routines to direct
175 their output to the UART on Highbank based devices.
177 config DEBUG_IMX1_UART
178 bool "i.MX1 Debug UART"
181 Say Y here if you want kernel low-level debugging support
184 config DEBUG_IMX23_UART
185 bool "i.MX23 Debug UART"
188 Say Y here if you want kernel low-level debugging support
191 config DEBUG_IMX25_UART
192 bool "i.MX25 Debug UART"
195 Say Y here if you want kernel low-level debugging support
198 config DEBUG_IMX21_IMX27_UART
199 bool "i.MX21 and i.MX27 Debug UART"
200 depends on SOC_IMX21 || SOC_IMX27
202 Say Y here if you want kernel low-level debugging support
205 config DEBUG_IMX28_UART
206 bool "i.MX28 Debug UART"
209 Say Y here if you want kernel low-level debugging support
212 config DEBUG_IMX31_UART
213 bool "i.MX31 Debug UART"
216 Say Y here if you want kernel low-level debugging support
219 config DEBUG_IMX35_UART
220 bool "i.MX35 Debug UART"
223 Say Y here if you want kernel low-level debugging support
226 config DEBUG_IMX51_UART
227 bool "i.MX51 Debug UART"
230 Say Y here if you want kernel low-level debugging support
233 config DEBUG_IMX53_UART
234 bool "i.MX53 Debug UART"
237 Say Y here if you want kernel low-level debugging support
240 config DEBUG_IMX6Q_UART
241 bool "i.MX6Q Debug UART"
244 Say Y here if you want kernel low-level debugging support
247 config DEBUG_MMP_UART2
248 bool "Kernel low-level debugging message via MMP UART2"
251 Say Y here if you want kernel low-level debugging support
254 config DEBUG_MMP_UART3
255 bool "Kernel low-level debugging message via MMP UART3"
258 Say Y here if you want kernel low-level debugging support
261 config DEBUG_MSM_UART1
262 bool "Kernel low-level debugging messages via MSM UART1"
263 depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50
265 Say Y here if you want the debug print routines to direct
266 their output to the first serial port on MSM devices.
268 config DEBUG_MSM_UART2
269 bool "Kernel low-level debugging messages via MSM UART2"
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 second serial port on MSM devices.
275 config DEBUG_MSM_UART3
276 bool "Kernel low-level debugging messages via MSM UART3"
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 third serial port on MSM devices.
282 config DEBUG_MSM8660_UART
283 bool "Kernel low-level debugging messages via MSM 8660 UART"
284 depends on ARCH_MSM8X60
285 select MSM_HAS_DEBUG_UART_HS
287 Say Y here if you want the debug print routines to direct
288 their output to the serial port on MSM 8660 devices.
290 config DEBUG_MSM8960_UART
291 bool "Kernel low-level debugging messages via MSM 8960 UART"
292 depends on ARCH_MSM8960
293 select MSM_HAS_DEBUG_UART_HS
295 Say Y here if you want the debug print routines to direct
296 their output to the serial port on MSM 8960 devices.
298 config DEBUG_MVEBU_UART
299 bool "Kernel low-level debugging messages via MVEBU UART"
300 depends on ARCH_MVEBU
302 Say Y here if you want kernel low-level debugging support
303 on MVEBU based platforms.
305 config DEBUG_OMAP2PLUS_UART
306 bool "Kernel low-level debugging messages via OMAP2PLUS UART"
307 depends on ARCH_OMAP2PLUS
309 Say Y here if you want kernel low-level debugging support
310 on OMAP2PLUS based platforms.
312 config DEBUG_PICOXCELL_UART
313 depends on ARCH_PICOXCELL
314 bool "Use PicoXcell UART for low-level debug"
316 Say Y here if you want kernel low-level debugging support
317 on PicoXcell based platforms.
319 config DEBUG_REALVIEW_STD_PORT
320 bool "RealView Default UART"
321 depends on ARCH_REALVIEW
323 Say Y here if you want the debug print routines to direct
324 their output to the serial port on RealView EB, PB11MP, PBA8
327 config DEBUG_REALVIEW_PB1176_PORT
328 bool "RealView PB1176 UART"
329 depends on MACH_REALVIEW_PB1176
331 Say Y here if you want the debug print routines to direct
332 their output to the standard serial port on the RealView
335 config DEBUG_S3C_UART0
336 depends on PLAT_SAMSUNG
337 bool "Use S3C UART 0 for low-level debug"
339 Say Y here if you want the debug print routines to direct
340 their output to UART 0. The port must have been initialised
341 by the boot-loader before use.
343 The uncompressor code port configuration is now handled
344 by CONFIG_S3C_LOWLEVEL_UART_PORT.
346 config DEBUG_S3C_UART1
347 depends on PLAT_SAMSUNG
348 bool "Use S3C UART 1 for low-level debug"
350 Say Y here if you want the debug print routines to direct
351 their output to UART 1. The port must have been initialised
352 by the boot-loader before use.
354 The uncompressor code port configuration is now handled
355 by CONFIG_S3C_LOWLEVEL_UART_PORT.
357 config DEBUG_S3C_UART2
358 depends on PLAT_SAMSUNG
359 bool "Use S3C UART 2 for low-level debug"
361 Say Y here if you want the debug print routines to direct
362 their output to UART 2. 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_UART3
369 depends on PLAT_SAMSUNG && ARCH_EXYNOS
370 bool "Use S3C UART 3 for low-level debug"
372 Say Y here if you want the debug print routines to direct
373 their output to UART 3. The port must have been initialised
374 by the boot-loader before use.
376 The uncompressor code port configuration is now handled
377 by CONFIG_S3C_LOWLEVEL_UART_PORT.
379 config DEBUG_SOCFPGA_UART
380 depends on ARCH_SOCFPGA
381 bool "Use SOCFPGA UART for low-level debug"
383 Say Y here if you want kernel low-level debugging support
384 on SOCFPGA based platforms.
386 config DEBUG_SUNXI_UART0
387 bool "Kernel low-level debugging messages via sunXi UART0"
388 depends on ARCH_SUNXI
390 Say Y here if you want kernel low-level debugging support
391 on Allwinner A1X based platforms on the UART0.
393 config DEBUG_SUNXI_UART1
394 bool "Kernel low-level debugging messages via sunXi UART1"
395 depends on ARCH_SUNXI
397 Say Y here if you want kernel low-level debugging support
398 on Allwinner A1X based platforms on the UART1.
400 config DEBUG_TEGRA_UART
401 depends on ARCH_TEGRA
402 bool "Use Tegra UART for low-level debug"
404 Say Y here if you want kernel low-level debugging support
405 on Tegra based platforms.
407 config DEBUG_SIRFPRIMA2_UART1
408 bool "Kernel low-level debugging messages via SiRFprimaII UART1"
409 depends on ARCH_PRIMA2
411 Say Y here if you want the debug print routines to direct
412 their output to the uart1 port on SiRFprimaII devices.
414 config DEBUG_SIRFMARCO_UART1
415 bool "Kernel low-level debugging messages via SiRFmarco UART1"
416 depends on ARCH_MARCO
418 Say Y here if you want the debug print routines to direct
419 their output to the uart1 port on SiRFmarco devices.
421 config DEBUG_VEXPRESS_UART0_DETECT
422 bool "Autodetect UART0 on Versatile Express Cortex-A core tiles"
423 depends on ARCH_VEXPRESS && CPU_CP15_MMU
425 This option enables a simple heuristic which tries to determine
426 the motherboard's memory map variant (original or RS1) and then
427 choose the relevant UART0 base address.
429 Note that this will only work with standard A-class core tiles,
430 and may fail with non-standard SMM or custom software models.
432 config DEBUG_VEXPRESS_UART0_CA9
433 bool "Use PL011 UART0 at 0x10009000 (V2P-CA9 core tile)"
434 depends on ARCH_VEXPRESS
436 This option selects UART0 at 0x10009000. Except for custom models,
437 this applies only to the V2P-CA9 tile.
439 config DEBUG_VEXPRESS_UART0_RS1
440 bool "Use PL011 UART0 at 0x1c090000 (RS1 complaint tiles)"
441 depends on ARCH_VEXPRESS
443 This option selects UART0 at 0x1c090000. This applies to most
444 of the tiles using the RS1 memory map, including all new A-class
445 core tiles, FPGA-based SMMs and software models.
447 config DEBUG_VT8500_UART0
448 bool "Use UART0 on VIA/Wondermedia SoCs"
449 depends on ARCH_VT8500
451 This option selects UART0 on VIA/Wondermedia System-on-a-chip
452 devices, including VT8500, WM8505, WM8650 and WM8850.
454 config DEBUG_LL_UART_NONE
455 bool "No low-level debugging UART"
456 depends on !ARCH_MULTIPLATFORM
458 Say Y here if your platform doesn't provide a UART option
459 below. This relies on your platform choosing the right UART
460 definition internally in order for low-level debugging to
464 bool "Kernel low-level debugging via EmbeddedICE DCC channel"
466 Say Y here if you want the debug print routines to direct
467 their output to the EmbeddedICE macrocell's DCC channel using
468 co-processor 14. This is known to work on the ARM9 style ICE
469 channel and on the XScale with the PEEDI.
471 Note that the system will appear to hang during boot if there
472 is nothing connected to read from the DCC.
474 config DEBUG_SEMIHOSTING
475 bool "Kernel low-level debug output via semihosting I/O"
477 Semihosting enables code running on an ARM target to use
478 the I/O facilities on a host debugger/emulator through a
479 simple SVC call. The host debugger or emulator must have
480 semihosting enabled for the special svc call to be trapped
481 otherwise the kernel will crash.
483 This is known to work with OpenOCD, as well as
484 ARM's Fast Models, or any other controlling environment
485 that implements semihosting.
487 For more details about semihosting, please see
488 chapter 8 of DUI0203I_rvct_developer_guide.pdf from ARM Ltd.
492 config DEBUG_IMX_UART_PORT
493 int "i.MX Debug UART Port Selection" if DEBUG_IMX1_UART || \
494 DEBUG_IMX25_UART || \
495 DEBUG_IMX21_IMX27_UART || \
496 DEBUG_IMX31_UART || \
497 DEBUG_IMX35_UART || \
498 DEBUG_IMX51_UART || \
499 DEBUG_IMX50_IMX53_UART || \
503 Choose UART port on which kernel low-level debug messages
507 prompt "Low-level debug console UART"
508 depends on DEBUG_OMAP2PLUS_UART
510 config DEBUG_OMAP2UART1
511 bool "OMAP2/3/4 UART1 (omap2/3 sdp boards and some omap3 boards)"
513 This covers at least h4, 2430sdp, 3430sdp, 3630sdp,
514 omap3 torpedo and 3530 lv som.
516 config DEBUG_OMAP2UART2
517 bool "OMAP2/3/4 UART2"
519 config DEBUG_OMAP2UART3
520 bool "OMAP2 UART3 (n8x0)"
522 config DEBUG_OMAP3UART3
523 bool "OMAP3 UART3 (most omap3 boards)"
525 This covers at least cm_t3x, beagle, crane, devkit8000,
526 igep00x0, ldp, n900, n9(50), pandora, overo, touchbook,
529 config DEBUG_OMAP4UART3
530 bool "OMAP4/5 UART3 (omap4 blaze, panda, omap5 sevm)"
532 config DEBUG_OMAP3UART4
533 bool "OMAP36XX UART4"
535 config DEBUG_OMAP4UART4
538 config DEBUG_TI81XXUART1
539 bool "TI81XX UART1 (ti8148evm)"
541 config DEBUG_TI81XXUART2
544 config DEBUG_TI81XXUART3
545 bool "TI81XX UART3 (ti8168evm)"
547 config DEBUG_AM33XXUART1
550 config DEBUG_ZOOM_UART
555 prompt "Low-level debug console UART"
556 depends on DEBUG_LL && DEBUG_TEGRA_UART
558 config TEGRA_DEBUG_UART_AUTO_ODMDATA
561 Automatically determines which UART to use for low-level debug based
562 on the ODMDATA value. This value is part of the BCT, and is written
563 to the boot memory device using nvflash, or other flashing tool.
564 When bits 19:18 are 3, then bits 17:15 indicate which UART to use;
565 0/1/2/3/4 are UART A/B/C/D/E.
567 config TEGRA_DEBUG_UARTA
570 config TEGRA_DEBUG_UARTB
573 config TEGRA_DEBUG_UARTC
576 config TEGRA_DEBUG_UARTD
579 config TEGRA_DEBUG_UARTE
584 config DEBUG_LL_INCLUDE
586 default "debug/bcm2835.S" if DEBUG_BCM2835
587 default "debug/icedcc.S" if DEBUG_ICEDCC
588 default "debug/imx.S" if DEBUG_IMX1_UART || \
589 DEBUG_IMX25_UART || \
590 DEBUG_IMX21_IMX27_UART || \
591 DEBUG_IMX31_UART || \
592 DEBUG_IMX35_UART || \
593 DEBUG_IMX51_UART || \
596 default "debug/highbank.S" if DEBUG_HIGHBANK_UART
597 default "debug/mvebu.S" if DEBUG_MVEBU_UART
598 default "debug/omap2plus.S" if DEBUG_OMAP2PLUS_UART
599 default "debug/picoxcell.S" if DEBUG_PICOXCELL_UART
600 default "debug/socfpga.S" if DEBUG_SOCFPGA_UART
601 default "debug/sunxi.S" if DEBUG_SUNXI_UART0 || DEBUG_SUNXI_UART1
602 default "debug/vexpress.S" if DEBUG_VEXPRESS_UART0_DETECT || \
603 DEBUG_VEXPRESS_UART0_CA9 || DEBUG_VEXPRESS_UART0_RS1
604 default "debug/vt8500.S" if DEBUG_VT8500_UART0
605 default "debug/tegra.S" if DEBUG_TEGRA_UART
606 default "debug/zynq.S" if DEBUG_ZYNQ_UART0 || DEBUG_ZYNQ_UART1
607 default "mach/debug-macro.S"
613 Say Y here if you want to have an early console using the
614 kernel low-level debugging functions. Add earlyprintk to your
615 kernel parameters to enable this console.
618 bool "On-chip ETM and ETB"
621 Enables the on-chip embedded trace macrocell and embedded trace
622 buffer driver that will allow you to collect traces of the
625 config ARM_KPROBES_TEST
626 tristate "Kprobes test module"
627 depends on KPROBES && MODULES
629 Perform tests of kprobes API and instruction set simulation.
631 config PID_IN_CONTEXTIDR
632 bool "Write the current PID to the CONTEXTIDR register"
633 depends on CPU_COPY_V6
635 Enabling this option causes the kernel to write the current PID to
636 the PROCID field of the CONTEXTIDR register, at the expense of some
637 additional instructions during context switch. Say Y here only if you
638 are planning to use hardware trace tools with this kernel.