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_KEYSTONE_UART0
262 bool "Kernel low-level debugging on KEYSTONE2 using UART0"
263 depends on ARCH_KEYSTONE
265 Say Y here if you want the debug print routines to direct
266 their output to UART0 serial port on KEYSTONE2 devices.
268 config DEBUG_KEYSTONE_UART1
269 bool "Kernel low-level debugging on KEYSTONE2 using UART1"
270 depends on ARCH_KEYSTONE
272 Say Y here if you want the debug print routines to direct
273 their output to UART1 serial port on KEYSTONE2 devices.
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 (old bootloaders)"
328 depends on ARCH_MVEBU
330 Say Y here if you want kernel low-level debugging support
331 on MVEBU based platforms.
333 This option should be used with the old bootloaders
334 that left the internal registers mapped at
335 0xd0000000. As of today, this is the case on
336 platforms such as the Globalscale Mirabox or the
337 Plathome OpenBlocks AX3, when using the original
340 If the wrong DEBUG_MVEBU_UART* option is selected,
341 when u-boot hands over to the kernel, the system
342 silently crashes, with no serial output at all.
344 config DEBUG_MVEBU_UART_ALTERNATE
345 bool "Kernel low-level debugging messages via MVEBU UART (new bootloaders)"
346 depends on ARCH_MVEBU
348 Say Y here if you want kernel low-level debugging support
349 on MVEBU based platforms.
351 This option should be used with the new bootloaders
352 that remap the internal registers at 0xf1000000.
354 If the wrong DEBUG_MVEBU_UART* option is selected,
355 when u-boot hands over to the kernel, the system
356 silently crashes, with no serial output at all.
358 config DEBUG_NOMADIK_UART
359 bool "Kernel low-level debugging messages via NOMADIK UART"
360 depends on ARCH_NOMADIK
362 Say Y here if you want kernel low-level debugging support
363 on NOMADIK based platforms.
365 config DEBUG_OMAP2PLUS_UART
366 bool "Kernel low-level debugging messages via OMAP2PLUS UART"
367 depends on ARCH_OMAP2PLUS
369 Say Y here if you want kernel low-level debugging support
370 on OMAP2PLUS based platforms.
372 config DEBUG_PICOXCELL_UART
373 depends on ARCH_PICOXCELL
374 bool "Use PicoXcell UART for low-level debug"
376 Say Y here if you want kernel low-level debugging support
377 on PicoXcell based platforms.
379 config DEBUG_PXA_UART1
381 bool "Use PXA UART1 for low-level debug"
383 Say Y here if you want kernel low-level debugging support
386 config DEBUG_REALVIEW_STD_PORT
387 bool "RealView Default UART"
388 depends on ARCH_REALVIEW
390 Say Y here if you want the debug print routines to direct
391 their output to the serial port on RealView EB, PB11MP, PBA8
394 config DEBUG_REALVIEW_PB1176_PORT
395 bool "RealView PB1176 UART"
396 depends on MACH_REALVIEW_PB1176
398 Say Y here if you want the debug print routines to direct
399 their output to the standard serial port on the RealView
402 config DEBUG_S3C_UART0
403 depends on PLAT_SAMSUNG
404 select DEBUG_EXYNOS_UART if ARCH_EXYNOS
405 bool "Use S3C UART 0 for low-level debug"
407 Say Y here if you want the debug print routines to direct
408 their output to UART 0. The port must have been initialised
409 by the boot-loader before use.
411 The uncompressor code port configuration is now handled
412 by CONFIG_S3C_LOWLEVEL_UART_PORT.
414 config DEBUG_S3C_UART1
415 depends on PLAT_SAMSUNG
416 select DEBUG_EXYNOS_UART if ARCH_EXYNOS
417 bool "Use S3C UART 1 for low-level debug"
419 Say Y here if you want the debug print routines to direct
420 their output to UART 1. The port must have been initialised
421 by the boot-loader before use.
423 The uncompressor code port configuration is now handled
424 by CONFIG_S3C_LOWLEVEL_UART_PORT.
426 config DEBUG_S3C_UART2
427 depends on PLAT_SAMSUNG
428 select DEBUG_EXYNOS_UART if ARCH_EXYNOS
429 bool "Use S3C UART 2 for low-level debug"
431 Say Y here if you want the debug print routines to direct
432 their output to UART 2. The port must have been initialised
433 by the boot-loader before use.
435 The uncompressor code port configuration is now handled
436 by CONFIG_S3C_LOWLEVEL_UART_PORT.
438 config DEBUG_S3C_UART3
439 depends on PLAT_SAMSUNG && ARCH_EXYNOS
440 select DEBUG_EXYNOS_UART
441 bool "Use S3C UART 3 for low-level debug"
443 Say Y here if you want the debug print routines to direct
444 their output to UART 3. The port must have been initialised
445 by the boot-loader before use.
447 The uncompressor code port configuration is now handled
448 by CONFIG_S3C_LOWLEVEL_UART_PORT.
450 config DEBUG_SOCFPGA_UART
451 depends on ARCH_SOCFPGA
452 bool "Use SOCFPGA UART for low-level debug"
454 Say Y here if you want kernel low-level debugging support
455 on SOCFPGA based platforms.
457 config DEBUG_SUNXI_UART0
458 bool "Kernel low-level debugging messages via sunXi UART0"
459 depends on ARCH_SUNXI
461 Say Y here if you want kernel low-level debugging support
462 on Allwinner A1X based platforms on the UART0.
464 config DEBUG_SUNXI_UART1
465 bool "Kernel low-level debugging messages via sunXi UART1"
466 depends on ARCH_SUNXI
468 Say Y here if you want kernel low-level debugging support
469 on Allwinner A1X based platforms on the UART1.
471 config DEBUG_TEGRA_UART
472 depends on ARCH_TEGRA
473 bool "Use Tegra UART for low-level debug"
475 Say Y here if you want kernel low-level debugging support
476 on Tegra based platforms.
478 config DEBUG_SIRFPRIMA2_UART1
479 bool "Kernel low-level debugging messages via SiRFprimaII UART1"
480 depends on ARCH_PRIMA2
482 Say Y here if you want the debug print routines to direct
483 their output to the uart1 port on SiRFprimaII devices.
485 config DEBUG_SIRFMARCO_UART1
486 bool "Kernel low-level debugging messages via SiRFmarco UART1"
487 depends on ARCH_MARCO
489 Say Y here if you want the debug print routines to direct
490 their output to the uart1 port on SiRFmarco devices.
492 config DEBUG_U300_UART
493 bool "Kernel low-level debugging messages via U300 UART0"
496 Say Y here if you want the debug print routines to direct
497 their output to the uart port on U300 devices.
499 config DEBUG_UX500_UART
500 depends on ARCH_U8500
501 bool "Use Ux500 UART for low-level debug"
503 Say Y here if you want kernel low-level debugging support
504 on Ux500 based platforms.
506 config DEBUG_VEXPRESS_UART0_DETECT
507 bool "Autodetect UART0 on Versatile Express Cortex-A core tiles"
508 depends on ARCH_VEXPRESS && CPU_CP15_MMU
510 This option enables a simple heuristic which tries to determine
511 the motherboard's memory map variant (original or RS1) and then
512 choose the relevant UART0 base address.
514 Note that this will only work with standard A-class core tiles,
515 and may fail with non-standard SMM or custom software models.
517 config DEBUG_VEXPRESS_UART0_CA9
518 bool "Use PL011 UART0 at 0x10009000 (V2P-CA9 core tile)"
519 depends on ARCH_VEXPRESS
521 This option selects UART0 at 0x10009000. Except for custom models,
522 this applies only to the V2P-CA9 tile.
524 config DEBUG_VEXPRESS_UART0_RS1
525 bool "Use PL011 UART0 at 0x1c090000 (RS1 complaint tiles)"
526 depends on ARCH_VEXPRESS
528 This option selects UART0 at 0x1c090000. This applies to most
529 of the tiles using the RS1 memory map, including all new A-class
530 core tiles, FPGA-based SMMs and software models.
532 config DEBUG_VT8500_UART0
533 bool "Use UART0 on VIA/Wondermedia SoCs"
534 depends on ARCH_VT8500
536 This option selects UART0 on VIA/Wondermedia System-on-a-chip
537 devices, including VT8500, WM8505, WM8650 and WM8850.
539 config DEBUG_LL_UART_NONE
540 bool "No low-level debugging UART"
541 depends on !ARCH_MULTIPLATFORM
543 Say Y here if your platform doesn't provide a UART option
544 below. This relies on your platform choosing the right UART
545 definition internally in order for low-level debugging to
549 bool "Kernel low-level debugging via EmbeddedICE DCC channel"
551 Say Y here if you want the debug print routines to direct
552 their output to the EmbeddedICE macrocell's DCC channel using
553 co-processor 14. This is known to work on the ARM9 style ICE
554 channel and on the XScale with the PEEDI.
556 Note that the system will appear to hang during boot if there
557 is nothing connected to read from the DCC.
559 config DEBUG_SEMIHOSTING
560 bool "Kernel low-level debug output via semihosting I/O"
562 Semihosting enables code running on an ARM target to use
563 the I/O facilities on a host debugger/emulator through a
564 simple SVC call. The host debugger or emulator must have
565 semihosting enabled for the special svc call to be trapped
566 otherwise the kernel will crash.
568 This is known to work with OpenOCD, as well as
569 ARM's Fast Models, or any other controlling environment
570 that implements semihosting.
572 For more details about semihosting, please see
573 chapter 8 of DUI0203I_rvct_developer_guide.pdf from ARM Ltd.
577 config DEBUG_EXYNOS_UART
580 config DEBUG_IMX_UART_PORT
581 int "i.MX Debug UART Port Selection" if DEBUG_IMX1_UART || \
582 DEBUG_IMX25_UART || \
583 DEBUG_IMX21_IMX27_UART || \
584 DEBUG_IMX31_UART || \
585 DEBUG_IMX35_UART || \
586 DEBUG_IMX51_UART || \
587 DEBUG_IMX53_UART || \
588 DEBUG_IMX6Q_UART || \
593 Choose UART port on which kernel low-level debug messages
597 prompt "Low-level debug console UART"
598 depends on DEBUG_OMAP2PLUS_UART
600 config DEBUG_OMAP2UART1
601 bool "OMAP2/3/4 UART1 (omap2/3 sdp boards and some omap3 boards)"
603 This covers at least h4, 2430sdp, 3430sdp, 3630sdp,
604 omap3 torpedo and 3530 lv som.
606 config DEBUG_OMAP2UART2
607 bool "OMAP2/3/4 UART2"
609 config DEBUG_OMAP2UART3
610 bool "OMAP2 UART3 (n8x0)"
612 config DEBUG_OMAP3UART3
613 bool "OMAP3 UART3 (most omap3 boards)"
615 This covers at least cm_t3x, beagle, crane, devkit8000,
616 igep00x0, ldp, n900, n9(50), pandora, overo, touchbook,
619 config DEBUG_OMAP4UART3
620 bool "OMAP4/5 UART3 (omap4 blaze, panda, omap5 sevm)"
622 config DEBUG_OMAP3UART4
623 bool "OMAP36XX UART4"
625 config DEBUG_OMAP4UART4
628 config DEBUG_TI81XXUART1
629 bool "TI81XX UART1 (ti8148evm)"
631 config DEBUG_TI81XXUART2
634 config DEBUG_TI81XXUART3
635 bool "TI81XX UART3 (ti8168evm)"
637 config DEBUG_AM33XXUART1
640 config DEBUG_ZOOM_UART
645 prompt "Low-level debug console UART"
646 depends on DEBUG_LL && DEBUG_TEGRA_UART
648 config TEGRA_DEBUG_UART_AUTO_ODMDATA
651 Automatically determines which UART to use for low-level debug based
652 on the ODMDATA value. This value is part of the BCT, and is written
653 to the boot memory device using nvflash, or other flashing tool.
654 When bits 19:18 are 3, then bits 17:15 indicate which UART to use;
655 0/1/2/3/4 are UART A/B/C/D/E.
657 config TEGRA_DEBUG_UARTA
660 config TEGRA_DEBUG_UARTB
663 config TEGRA_DEBUG_UARTC
666 config TEGRA_DEBUG_UARTD
669 config TEGRA_DEBUG_UARTE
674 config DEBUG_LL_INCLUDE
676 default "debug/bcm2835.S" if DEBUG_BCM2835
677 default "debug/cns3xxx.S" if DEBUG_CNS3XXX
678 default "debug/exynos.S" if DEBUG_EXYNOS_UART
679 default "debug/highbank.S" if DEBUG_HIGHBANK_UART
680 default "debug/icedcc.S" if DEBUG_ICEDCC
681 default "debug/imx.S" if DEBUG_IMX1_UART || \
682 DEBUG_IMX25_UART || \
683 DEBUG_IMX21_IMX27_UART || \
684 DEBUG_IMX31_UART || \
685 DEBUG_IMX35_UART || \
686 DEBUG_IMX51_UART || \
688 DEBUG_IMX6Q_UART || \
690 default "debug/keystone.S" if DEBUG_KEYSTONE_UART0 || \
692 default "debug/mvebu.S" if DEBUG_MVEBU_UART || \
693 DEBUG_MVEBU_UART_ALTERNATE
694 default "debug/mxs.S" if DEBUG_IMX23_UART || DEBUG_IMX28_UART
695 default "debug/nomadik.S" if DEBUG_NOMADIK_UART
696 default "debug/omap2plus.S" if DEBUG_OMAP2PLUS_UART
697 default "debug/picoxcell.S" if DEBUG_PICOXCELL_UART
698 default "debug/pxa.S" if DEBUG_PXA_UART1 || DEBUG_MMP_UART2 || \
700 default "debug/sirf.S" if DEBUG_SIRFPRIMA2_UART1 || DEBUG_SIRFMARCO_UART1
701 default "debug/socfpga.S" if DEBUG_SOCFPGA_UART
702 default "debug/sunxi.S" if DEBUG_SUNXI_UART0 || DEBUG_SUNXI_UART1
703 default "debug/tegra.S" if DEBUG_TEGRA_UART
704 default "debug/u300.S" if DEBUG_U300_UART
705 default "debug/ux500.S" if DEBUG_UX500_UART
706 default "debug/vexpress.S" if DEBUG_VEXPRESS_UART0_DETECT || \
707 DEBUG_VEXPRESS_UART0_CA9 || DEBUG_VEXPRESS_UART0_RS1
708 default "debug/vt8500.S" if DEBUG_VT8500_UART0
709 default "debug/zynq.S" if DEBUG_ZYNQ_UART0 || DEBUG_ZYNQ_UART1
710 default "mach/debug-macro.S"
712 config DEBUG_UNCOMPRESS
714 default y if ARCH_MULTIPLATFORM && DEBUG_LL && \
715 !DEBUG_OMAP2PLUS_UART && \
718 config UNCOMPRESS_INCLUDE
720 default "debug/uncompress.h" if ARCH_MULTIPLATFORM
721 default "mach/uncompress.h"
727 Say Y here if you want to have an early console using the
728 kernel low-level debugging functions. Add earlyprintk to your
729 kernel parameters to enable this console.
732 bool "On-chip ETM and ETB"
735 Enables the on-chip embedded trace macrocell and embedded trace
736 buffer driver that will allow you to collect traces of the
739 config ARM_KPROBES_TEST
740 tristate "Kprobes test module"
741 depends on KPROBES && MODULES
743 Perform tests of kprobes API and instruction set simulation.
745 config PID_IN_CONTEXTIDR
746 bool "Write the current PID to the CONTEXTIDR register"
747 depends on CPU_COPY_V6
749 Enabling this option causes the kernel to write the current PID to
750 the PROCID field of the CONTEXTIDR register, at the expense of some
751 additional instructions during context switch. Say Y here only if you
752 are planning to use hardware trace tools with this kernel.