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)"
35 depends on AEABI && 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_IMX35_UART
209 bool "i.MX31 and i.MX35 Debug UART"
210 depends on SOC_IMX31 || SOC_IMX35
212 Say Y here if you want kernel low-level debugging support
215 config DEBUG_IMX51_UART
216 bool "i.MX51 Debug UART"
219 Say Y here if you want kernel low-level debugging support
222 config DEBUG_IMX50_IMX53_UART
223 bool "i.MX50 and i.MX53 Debug UART"
224 depends on SOC_IMX50 || SOC_IMX53
226 Say Y here if you want kernel low-level debugging support
229 config DEBUG_IMX6Q_UART
230 bool "i.MX6Q Debug UART"
233 Say Y here if you want kernel low-level debugging support
236 config DEBUG_MMP_UART2
237 bool "Kernel low-level debugging message via MMP UART2"
240 Say Y here if you want kernel low-level debugging support
243 config DEBUG_MMP_UART3
244 bool "Kernel low-level debugging message via MMP UART3"
247 Say Y here if you want kernel low-level debugging support
250 config DEBUG_MSM_UART1
251 bool "Kernel low-level debugging messages via MSM UART1"
252 depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50
254 Say Y here if you want the debug print routines to direct
255 their output to the first serial port on MSM devices.
257 config DEBUG_MSM_UART2
258 bool "Kernel low-level debugging messages via MSM UART2"
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 second serial port on MSM devices.
264 config DEBUG_MSM_UART3
265 bool "Kernel low-level debugging messages via MSM UART3"
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 third serial port on MSM devices.
271 config DEBUG_MSM8660_UART
272 bool "Kernel low-level debugging messages via MSM 8660 UART"
273 depends on ARCH_MSM8X60
274 select MSM_HAS_DEBUG_UART_HS
276 Say Y here if you want the debug print routines to direct
277 their output to the serial port on MSM 8660 devices.
279 config DEBUG_MSM8960_UART
280 bool "Kernel low-level debugging messages via MSM 8960 UART"
281 depends on ARCH_MSM8960
282 select MSM_HAS_DEBUG_UART_HS
284 Say Y here if you want the debug print routines to direct
285 their output to the serial port on MSM 8960 devices.
287 config DEBUG_MVEBU_UART
288 bool "Kernel low-level debugging messages via MVEBU UART"
289 depends on ARCH_MVEBU
291 Say Y here if you want kernel low-level debugging support
292 on MVEBU based platforms.
294 config DEBUG_PICOXCELL_UART
295 depends on ARCH_PICOXCELL
296 bool "Use PicoXcell UART for low-level debug"
298 Say Y here if you want kernel low-level debugging support
299 on PicoXcell based platforms.
301 config DEBUG_REALVIEW_STD_PORT
302 bool "RealView Default UART"
303 depends on ARCH_REALVIEW
305 Say Y here if you want the debug print routines to direct
306 their output to the serial port on RealView EB, PB11MP, PBA8
309 config DEBUG_REALVIEW_PB1176_PORT
310 bool "RealView PB1176 UART"
311 depends on MACH_REALVIEW_PB1176
313 Say Y here if you want the debug print routines to direct
314 their output to the standard serial port on the RealView
317 config DEBUG_S3C_UART0
318 depends on PLAT_SAMSUNG
319 bool "Use S3C UART 0 for low-level debug"
321 Say Y here if you want the debug print routines to direct
322 their output to UART 0. The port must have been initialised
323 by the boot-loader before use.
325 The uncompressor code port configuration is now handled
326 by CONFIG_S3C_LOWLEVEL_UART_PORT.
328 config DEBUG_S3C_UART1
329 depends on PLAT_SAMSUNG
330 bool "Use S3C UART 1 for low-level debug"
332 Say Y here if you want the debug print routines to direct
333 their output to UART 1. The port must have been initialised
334 by the boot-loader before use.
336 The uncompressor code port configuration is now handled
337 by CONFIG_S3C_LOWLEVEL_UART_PORT.
339 config DEBUG_S3C_UART2
340 depends on PLAT_SAMSUNG
341 bool "Use S3C UART 2 for low-level debug"
343 Say Y here if you want the debug print routines to direct
344 their output to UART 2. The port must have been initialised
345 by the boot-loader before use.
347 The uncompressor code port configuration is now handled
348 by CONFIG_S3C_LOWLEVEL_UART_PORT.
350 config DEBUG_S3C_UART3
351 depends on PLAT_SAMSUNG && ARCH_EXYNOS
352 bool "Use S3C UART 3 for low-level debug"
354 Say Y here if you want the debug print routines to direct
355 their output to UART 3. The port must have been initialised
356 by the boot-loader before use.
358 The uncompressor code port configuration is now handled
359 by CONFIG_S3C_LOWLEVEL_UART_PORT.
361 config DEBUG_SOCFPGA_UART
362 depends on ARCH_SOCFPGA
363 bool "Use SOCFPGA UART for low-level debug"
365 Say Y here if you want kernel low-level debugging support
366 on SOCFPGA based platforms.
368 config DEBUG_SUNXI_UART0
369 bool "Kernel low-level debugging messages via sunXi UART0"
370 depends on ARCH_SUNXI
372 Say Y here if you want kernel low-level debugging support
373 on Allwinner A1X based platforms on the UART0.
375 config DEBUG_SUNXI_UART1
376 bool "Kernel low-level debugging messages via sunXi UART1"
377 depends on ARCH_SUNXI
379 Say Y here if you want kernel low-level debugging support
380 on Allwinner A1X based platforms on the UART1.
382 config DEBUG_TEGRA_UART
383 depends on ARCH_TEGRA
384 bool "Use Tegra UART for low-level debug"
386 Say Y here if you want kernel low-level debugging support
387 on Tegra based platforms.
389 config DEBUG_SIRFPRIMA2_UART1
390 bool "Kernel low-level debugging messages via SiRFprimaII UART1"
391 depends on ARCH_PRIMA2
393 Say Y here if you want the debug print routines to direct
394 their output to the uart1 port on SiRFprimaII devices.
396 config DEBUG_SIRFMARCO_UART1
397 bool "Kernel low-level debugging messages via SiRFmarco UART1"
398 depends on ARCH_MARCO
400 Say Y here if you want the debug print routines to direct
401 their output to the uart1 port on SiRFmarco devices.
403 config DEBUG_VEXPRESS_UART0_DETECT
404 bool "Autodetect UART0 on Versatile Express Cortex-A core tiles"
405 depends on ARCH_VEXPRESS && CPU_CP15_MMU
407 This option enables a simple heuristic which tries to determine
408 the motherboard's memory map variant (original or RS1) and then
409 choose the relevant UART0 base address.
411 Note that this will only work with standard A-class core tiles,
412 and may fail with non-standard SMM or custom software models.
414 config DEBUG_VEXPRESS_UART0_CA9
415 bool "Use PL011 UART0 at 0x10009000 (V2P-CA9 core tile)"
416 depends on ARCH_VEXPRESS
418 This option selects UART0 at 0x10009000. Except for custom models,
419 this applies only to the V2P-CA9 tile.
421 config DEBUG_VEXPRESS_UART0_RS1
422 bool "Use PL011 UART0 at 0x1c090000 (RS1 complaint tiles)"
423 depends on ARCH_VEXPRESS
425 This option selects UART0 at 0x1c090000. This applies to most
426 of the tiles using the RS1 memory map, including all new A-class
427 core tiles, FPGA-based SMMs and software models.
429 config DEBUG_VT8500_UART0
430 bool "Use UART0 on VIA/Wondermedia SoCs"
431 depends on ARCH_VT8500
433 This option selects UART0 on VIA/Wondermedia System-on-a-chip
434 devices, including VT8500, WM8505, WM8650 and WM8850.
436 config DEBUG_LL_UART_NONE
437 bool "No low-level debugging UART"
438 depends on !ARCH_MULTIPLATFORM
440 Say Y here if your platform doesn't provide a UART option
441 below. This relies on your platform choosing the right UART
442 definition internally in order for low-level debugging to
446 bool "Kernel low-level debugging via EmbeddedICE DCC channel"
448 Say Y here if you want the debug print routines to direct
449 their output to the EmbeddedICE macrocell's DCC channel using
450 co-processor 14. This is known to work on the ARM9 style ICE
451 channel and on the XScale with the PEEDI.
453 Note that the system will appear to hang during boot if there
454 is nothing connected to read from the DCC.
456 config DEBUG_SEMIHOSTING
457 bool "Kernel low-level debug output via semihosting I/O"
459 Semihosting enables code running on an ARM target to use
460 the I/O facilities on a host debugger/emulator through a
461 simple SVC call. The host debugger or emulator must have
462 semihosting enabled for the special svc call to be trapped
463 otherwise the kernel will crash.
465 This is known to work with OpenOCD, as well as
466 ARM's Fast Models, or any other controlling environment
467 that implements semihosting.
469 For more details about semihosting, please see
470 chapter 8 of DUI0203I_rvct_developer_guide.pdf from ARM Ltd.
474 config DEBUG_IMX6Q_UART_PORT
475 int "i.MX6Q Debug UART Port (1-5)" if DEBUG_IMX6Q_UART
480 Choose UART port on which kernel low-level debug messages
484 prompt "Low-level debug console UART"
485 depends on DEBUG_LL && DEBUG_TEGRA_UART
487 config TEGRA_DEBUG_UART_AUTO_ODMDATA
490 Automatically determines which UART to use for low-level debug based
491 on the ODMDATA value. This value is part of the BCT, and is written
492 to the boot memory device using nvflash, or other flashing tool.
493 When bits 19:18 are 3, then bits 17:15 indicate which UART to use;
494 0/1/2/3/4 are UART A/B/C/D/E.
496 config TEGRA_DEBUG_UARTA
499 config TEGRA_DEBUG_UARTB
502 config TEGRA_DEBUG_UARTC
505 config TEGRA_DEBUG_UARTD
508 config TEGRA_DEBUG_UARTE
513 config DEBUG_LL_INCLUDE
515 default "debug/icedcc.S" if DEBUG_ICEDCC
516 default "debug/imx.S" if DEBUG_IMX1_UART || \
517 DEBUG_IMX25_UART || \
518 DEBUG_IMX21_IMX27_UART || \
519 DEBUG_IMX31_IMX35_UART || \
520 DEBUG_IMX51_UART || \
521 DEBUG_IMX50_IMX53_UART ||\
523 default "debug/highbank.S" if DEBUG_HIGHBANK_UART
524 default "debug/mvebu.S" if DEBUG_MVEBU_UART
525 default "debug/picoxcell.S" if DEBUG_PICOXCELL_UART
526 default "debug/socfpga.S" if DEBUG_SOCFPGA_UART
527 default "debug/sunxi.S" if DEBUG_SUNXI_UART0 || DEBUG_SUNXI_UART1
528 default "debug/vexpress.S" if DEBUG_VEXPRESS_UART0_DETECT || \
529 DEBUG_VEXPRESS_UART0_CA9 || DEBUG_VEXPRESS_UART0_RS1
530 default "debug/vt8500.S" if DEBUG_VT8500_UART0
531 default "debug/tegra.S" if DEBUG_TEGRA_UART
532 default "debug/zynq.S" if DEBUG_ZYNQ_UART0 || DEBUG_ZYNQ_UART1
533 default "mach/debug-macro.S"
539 Say Y here if you want to have an early console using the
540 kernel low-level debugging functions. Add earlyprintk to your
541 kernel parameters to enable this console.
544 bool "On-chip ETM and ETB"
547 Enables the on-chip embedded trace macrocell and embedded trace
548 buffer driver that will allow you to collect traces of the
551 config ARM_KPROBES_TEST
552 tristate "Kprobes test module"
553 depends on KPROBES && MODULES
555 Perform tests of kprobes API and instruction set simulation.
557 config PID_IN_CONTEXTIDR
558 bool "Write the current PID to the CONTEXTIDR register"
559 depends on CPU_COPY_V6
561 Enabling this option causes the kernel to write the current PID to
562 the PROCID field of the CONTEXTIDR register, at the expense of some
563 additional instructions during context switch. Say Y here only if you
564 are planning to use hardware trace tools with this kernel.