3 source "lib/Kconfig.debug"
6 bool "Export kernel pagetable layout to userspace via debugfs"
7 depends on DEBUG_KERNEL
10 Say Y here if you want to show the kernel pagetable layout in a
11 debugfs file. This information is only useful for kernel developers
12 who are working in architecture specific areas of the kernel.
13 It is probably not a good idea to enable this feature in a production
18 bool "Filter access to /dev/mem"
21 If this option is disabled, you allow userspace (root) access to all
22 of memory, including kernel and userspace memory. Accidental
23 access to this is obviously disastrous, but specific access can
24 be used by people debugging the kernel.
26 If this option is switched on, the /dev/mem file only allows
27 userspace access to memory mapped peripherals.
31 # RMK wants arm kernels compiled with frame pointers or stack unwinding.
32 # If you know what you are doing and are willing to live without stack
33 # traces, you can get a slightly smaller kernel by setting this option to
34 # n, but then RMK will have to kill you ;).
37 depends on !THUMB2_KERNEL
38 default y if !ARM_UNWIND || FUNCTION_GRAPH_TRACER
40 If you say N here, the resulting kernel will be slightly smaller and
41 faster. However, if neither FRAME_POINTER nor ARM_UNWIND are enabled,
42 when a problem occurs with the kernel, the information that is
43 reported is severely limited.
46 bool "Enable stack unwinding support (EXPERIMENTAL)"
50 This option enables stack unwinding support in the kernel
51 using the information automatically generated by the
52 compiler. The resulting kernel image is slightly bigger but
53 the performance is not affected. Currently, this feature
54 only works with EABI compilers. If unsure say Y.
58 depends on FUNCTION_TRACER && FRAME_POINTER
62 bool "Verbose user fault messages"
64 When a user program crashes due to an exception, the kernel can
65 print a brief message explaining what the problem was. This is
66 sometimes helpful for debugging but serves no purpose on a
67 production system. Most people should say N here.
69 In addition, you need to pass user_debug=N on the kernel command
70 line to enable this feature. N consists of the sum of:
72 1 - undefined instruction events
74 4 - invalid data aborts
78 # These options are only for real kernel hackers who want to get their hands dirty.
80 bool "Kernel low-level debugging functions (read help!)"
81 depends on DEBUG_KERNEL
83 Say Y here to include definitions of printascii, printch, printhex
84 in the kernel. This is helpful if you are debugging code that
85 executes before the console is initialized.
87 Note that selecting this option will limit the kernel to a single
88 UART definition, as specified below. Attempting to boot the kernel
89 image on a different platform *will not work*, so this option should
90 not be enabled for kernels that are intended to be portable.
93 prompt "Kernel low-level debugging port"
96 config AT91_DEBUG_LL_DBGU0
97 bool "Kernel low-level debugging on rm9200, 9260/9g20, 9261/9g10 and 9rl"
98 depends on HAVE_AT91_DBGU0
100 config AT91_DEBUG_LL_DBGU1
101 bool "Kernel low-level debugging on 9263 and 9g45"
102 depends on HAVE_AT91_DBGU1
105 bool "Kernel low-level debugging on BCM2835 PL011 UART"
106 depends on ARCH_BCM2835
107 select DEBUG_UART_PL01X
109 config DEBUG_BCM_5301X
110 bool "Kernel low-level debugging on BCM5301X UART1"
111 depends on ARCH_BCM_5301X
112 select DEBUG_UART_PL01X
114 config DEBUG_BCM_KONA_UART
115 bool "Kernel low-level debugging messages via BCM KONA UART"
116 depends on ARCH_BCM_MOBILE
117 select DEBUG_UART_8250
119 Say Y here if you want kernel low-level debugging support
120 on Broadcom SoC platforms.
121 This low level debug works for Broadcom
122 mobile SoCs in the Kona family of chips (e.g. bcm28155,
125 config DEBUG_BERLIN_UART
126 bool "Marvell Berlin SoC Debug UART"
127 depends on ARCH_BERLIN
128 select DEBUG_UART_8250
130 Say Y here if you want kernel low-level debugging support
131 on Marvell Berlin SoC based platforms.
133 config DEBUG_CLPS711X_UART1
134 bool "Kernel low-level debugging messages via UART1"
135 depends on ARCH_CLPS711X
137 Say Y here if you want the debug print routines to direct
138 their output to the first serial port on these devices.
140 config DEBUG_CLPS711X_UART2
141 bool "Kernel low-level debugging messages via UART2"
142 depends on ARCH_CLPS711X
144 Say Y here if you want the debug print routines to direct
145 their output to the second serial port on these devices.
148 bool "Kernel Kernel low-level debugging on Cavium Networks CNS3xxx"
149 depends on ARCH_CNS3XXX
150 select DEBUG_UART_PL01X
152 Say Y here if you want the debug print routines to direct
153 their output to the CNS3xxx UART0.
155 config DEBUG_DAVINCI_DA8XX_UART1
156 bool "Kernel low-level debugging on DaVinci DA8XX using UART1"
157 depends on ARCH_DAVINCI_DA8XX
158 select DEBUG_UART_8250
160 Say Y here if you want the debug print routines to direct
161 their output to UART1 serial port on DaVinci DA8XX devices.
163 config DEBUG_DAVINCI_DA8XX_UART2
164 bool "Kernel low-level debugging on DaVinci DA8XX using UART2"
165 depends on ARCH_DAVINCI_DA8XX
166 select DEBUG_UART_8250
168 Say Y here if you want the debug print routines to direct
169 their output to UART2 serial port on DaVinci DA8XX devices.
171 config DEBUG_DAVINCI_DMx_UART0
172 bool "Kernel low-level debugging on DaVinci DMx using UART0"
173 depends on ARCH_DAVINCI_DMx
174 select DEBUG_UART_8250
176 Say Y here if you want the debug print routines to direct
177 their output to UART0 serial port on DaVinci DMx devices.
179 config DEBUG_ZYNQ_UART0
180 bool "Kernel low-level debugging on Xilinx Zynq using UART0"
183 Say Y here if you want the debug print routines to direct
184 their output to UART0 on the Zynq platform.
186 config DEBUG_ZYNQ_UART1
187 bool "Kernel low-level debugging on Xilinx Zynq using UART1"
190 Say Y here if you want the debug print routines to direct
191 their output to UART1 on the Zynq platform.
193 If you have a ZC702 board and want early boot messages to
194 appear on the USB serial adaptor, select this option.
196 config DEBUG_DC21285_PORT
197 bool "Kernel low-level debugging messages via footbridge serial port"
198 depends on FOOTBRIDGE
200 Say Y here if you want the debug print routines to direct
201 their output to the serial port in the DC21285 (Footbridge).
203 config DEBUG_FOOTBRIDGE_COM1
204 bool "Kernel low-level debugging messages via footbridge 8250 at PCI COM1"
205 depends on FOOTBRIDGE
207 Say Y here if you want the debug print routines to direct
208 their output to the 8250 at PCI COM1.
210 config DEBUG_HI3620_UART
211 bool "Hisilicon HI3620 Debug UART"
212 depends on ARCH_HI3xxx
213 select DEBUG_UART_PL01X
215 Say Y here if you want kernel low-level debugging support
218 config DEBUG_HI3716_UART
219 bool "Hisilicon Hi3716 Debug UART"
220 depends on ARCH_HI3xxx
221 select DEBUG_UART_PL01X
223 Say Y here if you want kernel low-level debugging support
226 config DEBUG_HIGHBANK_UART
227 bool "Kernel low-level debugging messages via Highbank UART"
228 depends on ARCH_HIGHBANK
229 select DEBUG_UART_PL01X
231 Say Y here if you want the debug print routines to direct
232 their output to the UART on Highbank based devices.
234 config DEBUG_IMX1_UART
235 bool "i.MX1 Debug UART"
238 Say Y here if you want kernel low-level debugging support
241 config DEBUG_IMX23_UART
242 bool "i.MX23 Debug UART"
244 select DEBUG_UART_PL01X
246 Say Y here if you want kernel low-level debugging support
249 config DEBUG_IMX25_UART
250 bool "i.MX25 Debug UART"
253 Say Y here if you want kernel low-level debugging support
256 config DEBUG_IMX21_IMX27_UART
257 bool "i.MX21 and i.MX27 Debug UART"
258 depends on SOC_IMX21 || SOC_IMX27
260 Say Y here if you want kernel low-level debugging support
263 config DEBUG_IMX28_UART
264 bool "i.MX28 Debug UART"
266 select DEBUG_UART_PL01X
268 Say Y here if you want kernel low-level debugging support
271 config DEBUG_IMX31_UART
272 bool "i.MX31 Debug UART"
275 Say Y here if you want kernel low-level debugging support
278 config DEBUG_IMX35_UART
279 bool "i.MX35 Debug UART"
282 Say Y here if you want kernel low-level debugging support
285 config DEBUG_IMX50_UART
286 bool "i.MX50 Debug UART"
289 Say Y here if you want kernel low-level debugging support
292 config DEBUG_IMX51_UART
293 bool "i.MX51 Debug UART"
296 Say Y here if you want kernel low-level debugging support
299 config DEBUG_IMX53_UART
300 bool "i.MX53 Debug UART"
303 Say Y here if you want kernel low-level debugging support
306 config DEBUG_IMX6Q_UART
307 bool "i.MX6Q/DL Debug UART"
310 Say Y here if you want kernel low-level debugging support
313 config DEBUG_IMX6SL_UART
314 bool "i.MX6SL Debug UART"
315 depends on SOC_IMX6SL
317 Say Y here if you want kernel low-level debugging support
320 config DEBUG_IMX6SX_UART
321 bool "i.MX6SX Debug UART"
322 depends on SOC_IMX6SX
324 Say Y here if you want kernel low-level debugging support
327 config DEBUG_KEYSTONE_UART0
328 bool "Kernel low-level debugging on KEYSTONE2 using UART0"
329 depends on ARCH_KEYSTONE
330 select DEBUG_UART_8250
332 Say Y here if you want the debug print routines to direct
333 their output to UART0 serial port on KEYSTONE2 devices.
335 config DEBUG_KEYSTONE_UART1
336 bool "Kernel low-level debugging on KEYSTONE2 using UART1"
337 depends on ARCH_KEYSTONE
338 select DEBUG_UART_8250
340 Say Y here if you want the debug print routines to direct
341 their output to UART1 serial port on KEYSTONE2 devices.
343 config DEBUG_MMP_UART2
344 bool "Kernel low-level debugging message via MMP UART2"
346 select DEBUG_UART_8250
348 Say Y here if you want kernel low-level debugging support
351 config DEBUG_MMP_UART3
352 bool "Kernel low-level debugging message via MMP UART3"
354 select DEBUG_UART_8250
356 Say Y here if you want kernel low-level debugging support
359 config DEBUG_MSM_UART
360 bool "Kernel low-level debugging messages via MSM UART"
363 Say Y here if you want the debug print routines to direct
364 their output to the serial port on MSM devices.
366 ARCH DEBUG_UART_PHYS DEBUG_UART_BASE #
367 MSM7X00A, QSD8X50 0xa9a00000 0xe1000000 UART1
368 MSM7X00A, QSD8X50 0xa9b00000 0xe1000000 UART2
369 MSM7X00A, QSD8X50 0xa9c00000 0xe1000000 UART3
371 MSM7X30 0xaca00000 0xe1000000 UART1
372 MSM7X30 0xacb00000 0xe1000000 UART2
373 MSM7X30 0xacc00000 0xe1000000 UART3
375 Please adjust DEBUG_UART_PHYS and DEBUG_UART_BASE configuration
376 options based on your needs.
378 config DEBUG_QCOM_UARTDM
379 bool "Kernel low-level debugging messages via QCOM UARTDM"
382 Say Y here if you want the debug print routines to direct
383 their output to the serial port on Qualcomm devices.
385 ARCH DEBUG_UART_PHYS DEBUG_UART_BASE
386 APQ8084 0xf995e000 0xfa75e000
387 MSM8X60 0x19c40000 0xf0040000
388 MSM8960 0x16440000 0xf0040000
389 MSM8974 0xf991e000 0xfa71e000
391 Please adjust DEBUG_UART_PHYS and DEBUG_UART_BASE configuration
392 options based on your needs.
394 config DEBUG_MVEBU_UART
395 bool "Kernel low-level debugging messages via MVEBU UART (old bootloaders)"
396 depends on ARCH_MVEBU
397 select DEBUG_UART_8250
399 Say Y here if you want kernel low-level debugging support
400 on MVEBU based platforms.
402 This option should be used with the old bootloaders
403 that left the internal registers mapped at
404 0xd0000000. As of today, this is the case on
405 platforms such as the Globalscale Mirabox or the
406 Plathome OpenBlocks AX3, when using the original
409 If the wrong DEBUG_MVEBU_UART* option is selected,
410 when u-boot hands over to the kernel, the system
411 silently crashes, with no serial output at all.
413 config DEBUG_MVEBU_UART_ALTERNATE
414 bool "Kernel low-level debugging messages via MVEBU UART (new bootloaders)"
415 depends on ARCH_MVEBU
416 select DEBUG_UART_8250
418 Say Y here if you want kernel low-level debugging support
419 on MVEBU based platforms.
421 This option should be used with the new bootloaders
422 that remap the internal registers at 0xf1000000.
424 If the wrong DEBUG_MVEBU_UART* option is selected,
425 when u-boot hands over to the kernel, the system
426 silently crashes, with no serial output at all.
432 Say Y here if you want kernel low-level debugging support
433 on Vybrid based platforms.
435 config DEBUG_NOMADIK_UART
436 bool "Kernel low-level debugging messages via NOMADIK UART"
437 depends on ARCH_NOMADIK
438 select DEBUG_UART_PL01X
440 Say Y here if you want kernel low-level debugging support
441 on NOMADIK based platforms.
443 config DEBUG_NSPIRE_CLASSIC_UART
444 bool "Kernel low-level debugging via TI-NSPIRE 8250 UART"
445 depends on ARCH_NSPIRE
446 select DEBUG_UART_8250
448 Say Y here if you want kernel low-level debugging support
449 on TI-NSPIRE classic models.
451 config DEBUG_NSPIRE_CX_UART
452 bool "Kernel low-level debugging via TI-NSPIRE PL011 UART"
453 depends on ARCH_NSPIRE
454 select DEBUG_UART_PL01X
456 Say Y here if you want kernel low-level debugging support
457 on TI-NSPIRE CX models.
459 config DEBUG_OMAP2UART1
460 bool "OMAP2/3/4 UART1 (omap2/3 sdp boards and some omap3 boards)"
461 depends on ARCH_OMAP2PLUS
462 select DEBUG_OMAP2PLUS_UART
464 This covers at least h4, 2430sdp, 3430sdp, 3630sdp,
465 omap3 torpedo and 3530 lv som.
467 config DEBUG_OMAP2UART2
468 bool "Kernel low-level debugging messages via OMAP2/3/4 UART2"
469 depends on ARCH_OMAP2PLUS
470 select DEBUG_OMAP2PLUS_UART
472 config DEBUG_OMAP2UART3
473 bool "Kernel low-level debugging messages via OMAP2 UART3 (n8x0)"
474 depends on ARCH_OMAP2PLUS
475 select DEBUG_OMAP2PLUS_UART
477 config DEBUG_OMAP3UART3
478 bool "Kernel low-level debugging messages via OMAP3 UART3 (most omap3 boards)"
479 depends on ARCH_OMAP2PLUS
480 select DEBUG_OMAP2PLUS_UART
482 This covers at least cm_t3x, beagle, crane, devkit8000,
483 igep00x0, ldp, n900, n9(50), pandora, overo, touchbook,
486 config DEBUG_OMAP4UART3
487 bool "Kernel low-level debugging messages via OMAP4/5 UART3 (omap4 blaze, panda, omap5 sevm)"
488 depends on ARCH_OMAP2PLUS
489 select DEBUG_OMAP2PLUS_UART
491 config DEBUG_OMAP3UART4
492 bool "Kernel low-level debugging messages via OMAP36XX UART4"
493 depends on ARCH_OMAP2PLUS
494 select DEBUG_OMAP2PLUS_UART
496 config DEBUG_OMAP4UART4
497 bool "Kernel low-level debugging messages via OMAP4/5 UART4"
498 depends on ARCH_OMAP2PLUS
499 select DEBUG_OMAP2PLUS_UART
501 config DEBUG_TI81XXUART1
502 bool "Kernel low-level debugging messages via TI81XX UART1 (ti8148evm)"
503 depends on ARCH_OMAP2PLUS
504 select DEBUG_OMAP2PLUS_UART
506 config DEBUG_TI81XXUART2
507 bool "Kernel low-level debugging messages via TI81XX UART2"
508 depends on ARCH_OMAP2PLUS
509 select DEBUG_OMAP2PLUS_UART
511 config DEBUG_TI81XXUART3
512 bool "Kernel low-level debugging messages via TI81XX UART3 (ti8168evm)"
513 depends on ARCH_OMAP2PLUS
514 select DEBUG_OMAP2PLUS_UART
516 config DEBUG_AM33XXUART1
517 bool "Kernel low-level debugging messages via AM33XX UART1"
518 depends on ARCH_OMAP2PLUS
519 select DEBUG_OMAP2PLUS_UART
521 config DEBUG_ZOOM_UART
522 bool "Kernel low-level debugging messages via Zoom2/3 UART"
523 depends on ARCH_OMAP2PLUS
524 select DEBUG_OMAP2PLUS_UART
526 config DEBUG_PICOXCELL_UART
527 depends on ARCH_PICOXCELL
528 bool "Use PicoXcell UART for low-level debug"
529 select DEBUG_UART_8250
531 Say Y here if you want kernel low-level debugging support
532 on PicoXcell based platforms.
534 config DEBUG_PXA_UART1
536 bool "Use PXA UART1 for low-level debug"
537 select DEBUG_UART_8250
539 Say Y here if you want kernel low-level debugging support
542 config DEBUG_REALVIEW_STD_PORT
543 bool "RealView Default UART"
544 depends on ARCH_REALVIEW
545 select DEBUG_UART_PL01X
547 Say Y here if you want the debug print routines to direct
548 their output to the serial port on RealView EB, PB11MP, PBA8
551 config DEBUG_REALVIEW_PB1176_PORT
552 bool "RealView PB1176 UART"
553 depends on MACH_REALVIEW_PB1176
554 select DEBUG_UART_PL01X
556 Say Y here if you want the debug print routines to direct
557 their output to the standard serial port on the RealView
560 config DEBUG_RK29_UART0
561 bool "Kernel low-level debugging messages via Rockchip RK29 UART0"
562 depends on ARCH_ROCKCHIP
563 select DEBUG_UART_8250
565 Say Y here if you want kernel low-level debugging support
566 on Rockchip based platforms.
568 config DEBUG_RK29_UART1
569 bool "Kernel low-level debugging messages via Rockchip RK29 UART1"
570 depends on ARCH_ROCKCHIP
571 select DEBUG_UART_8250
573 Say Y here if you want kernel low-level debugging support
574 on Rockchip based platforms.
576 config DEBUG_RK29_UART2
577 bool "Kernel low-level debugging messages via Rockchip RK29 UART2"
578 depends on ARCH_ROCKCHIP
579 select DEBUG_UART_8250
581 Say Y here if you want kernel low-level debugging support
582 on Rockchip based platforms.
584 config DEBUG_RK3X_UART0
585 bool "Kernel low-level debugging messages via Rockchip RK30/RK31 UART0"
586 depends on ARCH_ROCKCHIP
587 select DEBUG_UART_8250
589 Say Y here if you want kernel low-level debugging support
590 on Rockchip based platforms.
592 config DEBUG_RK3X_UART1
593 bool "Kernel low-level debugging messages via Rockchip RK30/RK31 UART1"
594 depends on ARCH_ROCKCHIP
595 select DEBUG_UART_8250
597 Say Y here if you want kernel low-level debugging support
598 on Rockchip based platforms.
600 config DEBUG_RK3X_UART2
601 bool "Kernel low-level debugging messages via Rockchip RK30/RK31 UART2"
602 depends on ARCH_ROCKCHIP
603 select DEBUG_UART_8250
605 Say Y here if you want kernel low-level debugging support
606 on Rockchip based platforms.
608 config DEBUG_RK3X_UART3
609 bool "Kernel low-level debugging messages via Rockchip RK30/RK31 UART3"
610 depends on ARCH_ROCKCHIP
611 select DEBUG_UART_8250
613 Say Y here if you want kernel low-level debugging support
614 on Rockchip based platforms.
616 config DEBUG_RK32_UART2
617 bool "Kernel low-level debugging messages via Rockchip RK32 UART2"
618 depends on ARCH_ROCKCHIP
619 select DEBUG_UART_8250
621 Say Y here if you want kernel low-level debugging support
622 on Rockchip RK32xx based platforms.
624 config DEBUG_S3C_UART0
625 depends on PLAT_SAMSUNG
626 select DEBUG_EXYNOS_UART if ARCH_EXYNOS
627 select DEBUG_S3C24XX_UART if ARCH_S3C24XX
628 bool "Use S3C UART 0 for low-level debug"
630 Say Y here if you want the debug print routines to direct
631 their output to UART 0. The port must have been initialised
632 by the boot-loader before use.
634 The uncompressor code port configuration is now handled
635 by CONFIG_S3C_LOWLEVEL_UART_PORT.
637 config DEBUG_S3C_UART1
638 depends on PLAT_SAMSUNG
639 select DEBUG_EXYNOS_UART if ARCH_EXYNOS
640 select DEBUG_S3C24XX_UART if ARCH_S3C24XX
641 bool "Use S3C UART 1 for low-level debug"
643 Say Y here if you want the debug print routines to direct
644 their output to UART 1. The port must have been initialised
645 by the boot-loader before use.
647 The uncompressor code port configuration is now handled
648 by CONFIG_S3C_LOWLEVEL_UART_PORT.
650 config DEBUG_S3C_UART2
651 depends on PLAT_SAMSUNG
652 select DEBUG_EXYNOS_UART if ARCH_EXYNOS
653 select DEBUG_S3C24XX_UART if ARCH_S3C24XX
654 bool "Use S3C UART 2 for low-level debug"
656 Say Y here if you want the debug print routines to direct
657 their output to UART 2. The port must have been initialised
658 by the boot-loader before use.
660 The uncompressor code port configuration is now handled
661 by CONFIG_S3C_LOWLEVEL_UART_PORT.
663 config DEBUG_S3C_UART3
664 depends on PLAT_SAMSUNG && ARCH_EXYNOS
665 select DEBUG_EXYNOS_UART
666 bool "Use S3C UART 3 for low-level debug"
668 Say Y here if you want the debug print routines to direct
669 their output to UART 3. The port must have been initialised
670 by the boot-loader before use.
672 The uncompressor code port configuration is now handled
673 by CONFIG_S3C_LOWLEVEL_UART_PORT.
675 config DEBUG_S3C2410_UART0
676 depends on ARCH_S3C24XX
677 select DEBUG_S3C2410_UART
678 bool "Use S3C2410/S3C2412 UART 0 for low-level debug"
680 Say Y here if you want the debug print routines to direct
681 their output to UART 0. The port must have been initialised
682 by the boot-loader before use.
684 config DEBUG_S3C2410_UART1
685 depends on ARCH_S3C24XX
686 select DEBUG_S3C2410_UART
687 bool "Use S3C2410/S3C2412 UART 1 for low-level debug"
689 Say Y here if you want the debug print routines to direct
690 their output to UART 1. The port must have been initialised
691 by the boot-loader before use.
693 config DEBUG_S3C2410_UART2
694 depends on ARCH_S3C24XX
695 select DEBUG_S3C2410_UART
696 bool "Use S3C2410/S3C2412 UART 2 for low-level debug"
698 Say Y here if you want the debug print routines to direct
699 their output to UART 2. The port must have been initialised
700 by the boot-loader before use.
702 config DEBUG_SOCFPGA_UART
703 depends on ARCH_SOCFPGA
704 bool "Use SOCFPGA UART for low-level debug"
705 select DEBUG_UART_8250
707 Say Y here if you want kernel low-level debugging support
708 on SOCFPGA based platforms.
710 config DEBUG_SUNXI_UART0
711 bool "Kernel low-level debugging messages via sunXi UART0"
712 depends on ARCH_SUNXI
713 select DEBUG_UART_8250
715 Say Y here if you want kernel low-level debugging support
716 on Allwinner A1X based platforms on the UART0.
718 config DEBUG_SUNXI_UART1
719 bool "Kernel low-level debugging messages via sunXi UART1"
720 depends on ARCH_SUNXI
721 select DEBUG_UART_8250
723 Say Y here if you want kernel low-level debugging support
724 on Allwinner A1X based platforms on the UART1.
726 config TEGRA_DEBUG_UART_AUTO_ODMDATA
727 bool "Kernel low-level debugging messages via Tegra UART via ODMDATA"
728 depends on ARCH_TEGRA
729 select DEBUG_TEGRA_UART
731 Automatically determines which UART to use for low-level
732 debug based on the ODMDATA value. This value is part of
733 the BCT, and is written to the boot memory device using
734 nvflash, or other flashing tool. When bits 19:18 are 3,
735 then bits 17:15 indicate which UART to use; 0/1/2/3/4
738 config TEGRA_DEBUG_UARTA
739 bool "Kernel low-level debugging messages via Tegra UART A"
740 depends on ARCH_TEGRA
741 select DEBUG_TEGRA_UART
743 Say Y here if you want kernel low-level debugging support
744 on Tegra based platforms.
746 config TEGRA_DEBUG_UARTB
747 bool "Kernel low-level debugging messages via Tegra UART B"
748 depends on ARCH_TEGRA
749 select DEBUG_TEGRA_UART
751 Say Y here if you want kernel low-level debugging support
752 on Tegra based platforms.
754 config TEGRA_DEBUG_UARTC
755 bool "Kernel low-level debugging messages via Tegra UART C"
756 depends on ARCH_TEGRA
757 select DEBUG_TEGRA_UART
759 Say Y here if you want kernel low-level debugging support
760 on Tegra based platforms.
762 config TEGRA_DEBUG_UARTD
763 bool "Kernel low-level debugging messages via Tegra UART D"
764 depends on ARCH_TEGRA
765 select DEBUG_TEGRA_UART
767 Say Y here if you want kernel low-level debugging support
768 on Tegra based platforms.
770 config TEGRA_DEBUG_UARTE
771 bool "Kernel low-level debugging messages via Tegra UART E"
772 depends on ARCH_TEGRA
773 select DEBUG_TEGRA_UART
775 Say Y here if you want kernel low-level debugging support
776 on Tegra based platforms.
778 config DEBUG_SIRFPRIMA2_UART1
779 bool "Kernel low-level debugging messages via SiRFprimaII UART1"
780 depends on ARCH_PRIMA2
782 Say Y here if you want the debug print routines to direct
783 their output to the uart1 port on SiRFprimaII devices.
785 config DEBUG_SIRFMARCO_UART1
786 bool "Kernel low-level debugging messages via SiRFmarco UART1"
787 depends on ARCH_MARCO
789 Say Y here if you want the debug print routines to direct
790 their output to the uart1 port on SiRFmarco devices.
792 config STIH41X_DEBUG_ASC2
793 bool "Use StiH415/416 ASC2 UART for low-level debug"
795 select DEBUG_STI_UART
797 Say Y here if you want kernel low-level debugging support
798 on STiH415/416 based platforms like b2000, which has
799 default UART wired up to ASC2.
803 config STIH41X_DEBUG_SBC_ASC1
804 bool "Use StiH415/416 SBC ASC1 UART for low-level debug"
806 select DEBUG_STI_UART
808 Say Y here if you want kernel low-level debugging support
809 on STiH415/416 based platforms like b2020. which has
810 default UART wired up to SBC ASC1.
814 config DEBUG_U300_UART
815 bool "Kernel low-level debugging messages via U300 UART0"
817 select DEBUG_UART_PL01X
819 Say Y here if you want the debug print routines to direct
820 their output to the uart port on U300 devices.
822 config DEBUG_UX500_UART
823 depends on ARCH_U8500
824 bool "Use Ux500 UART for low-level debug"
826 Say Y here if you want kernel low-level debugging support
827 on Ux500 based platforms.
829 config DEBUG_VEXPRESS_UART0_DETECT
830 bool "Autodetect UART0 on Versatile Express Cortex-A core tiles"
831 depends on ARCH_VEXPRESS && CPU_CP15_MMU
833 This option enables a simple heuristic which tries to determine
834 the motherboard's memory map variant (original or RS1) and then
835 choose the relevant UART0 base address.
837 Note that this will only work with standard A-class core tiles,
838 and may fail with non-standard SMM or custom software models.
840 config DEBUG_VEXPRESS_UART0_CA9
841 bool "Use PL011 UART0 at 0x10009000 (V2P-CA9 core tile)"
842 depends on ARCH_VEXPRESS
843 select DEBUG_UART_PL01X
845 This option selects UART0 at 0x10009000. Except for custom models,
846 this applies only to the V2P-CA9 tile.
848 config DEBUG_VEXPRESS_UART0_RS1
849 bool "Use PL011 UART0 at 0x1c090000 (RS1 complaint tiles)"
850 depends on ARCH_VEXPRESS
851 select DEBUG_UART_PL01X
853 This option selects UART0 at 0x1c090000. This applies to most
854 of the tiles using the RS1 memory map, including all new A-class
855 core tiles, FPGA-based SMMs and software models.
857 config DEBUG_VEXPRESS_UART0_CRX
858 bool "Use PL011 UART0 at 0xb0090000 (Cortex-R compliant tiles)"
859 depends on ARCH_VEXPRESS && !MMU
860 select DEBUG_UART_PL01X
862 This option selects UART0 at 0xb0090000. This is appropriate for
863 Cortex-R series tiles and SMMs, such as Cortex-R5 and Cortex-R7
865 config DEBUG_VT8500_UART0
866 bool "Use UART0 on VIA/Wondermedia SoCs"
867 depends on ARCH_VT8500
869 This option selects UART0 on VIA/Wondermedia System-on-a-chip
870 devices, including VT8500, WM8505, WM8650 and WM8850.
872 config DEBUG_LL_UART_NONE
873 bool "No low-level debugging UART"
874 depends on !ARCH_MULTIPLATFORM
876 Say Y here if your platform doesn't provide a UART option
877 above. This relies on your platform choosing the right UART
878 definition internally in order for low-level debugging to
882 bool "Kernel low-level debugging via EmbeddedICE DCC channel"
884 Say Y here if you want the debug print routines to direct
885 their output to the EmbeddedICE macrocell's DCC channel using
886 co-processor 14. This is known to work on the ARM9 style ICE
887 channel and on the XScale with the PEEDI.
889 Note that the system will appear to hang during boot if there
890 is nothing connected to read from the DCC.
892 config DEBUG_SEMIHOSTING
893 bool "Kernel low-level debug output via semihosting I/O"
895 Semihosting enables code running on an ARM target to use
896 the I/O facilities on a host debugger/emulator through a
897 simple SVC call. The host debugger or emulator must have
898 semihosting enabled for the special svc call to be trapped
899 otherwise the kernel will crash.
901 This is known to work with OpenOCD, as well as
902 ARM's Fast Models, or any other controlling environment
903 that implements semihosting.
905 For more details about semihosting, please see
906 chapter 8 of DUI0203I_rvct_developer_guide.pdf from ARM Ltd.
908 config DEBUG_LL_UART_8250
909 bool "Kernel low-level debugging via 8250 UART"
911 Say Y here if you wish the debug print routes to direct
912 their output to an 8250 UART. You can use this option
913 to provide the parameters for the 8250 UART rather than
914 selecting one of the platform specific options above if
915 you know the parameters for the port.
917 This option is preferred over the platform specific
918 options; the platform specific options are deprecated
919 and will be soon removed.
921 config DEBUG_LL_UART_EFM32
922 bool "Kernel low-level debugging via efm32 UART"
923 depends on ARCH_EFM32
925 Say Y here if you want the debug print routines to direct
926 their output to an UART or USART port on efm32 based
927 machines. Use the following addresses for DEBUG_UART_PHYS:
935 config DEBUG_LL_UART_PL01X
936 bool "Kernel low-level debugging via ARM Ltd PL01x Primecell UART"
938 Say Y here if you wish the debug print routes to direct
939 their output to a PL01x Primecell UART. You can use
940 this option to provide the parameters for the UART
941 rather than selecting one of the platform specific
942 options above if you know the parameters for the port.
944 This option is preferred over the platform specific
945 options; the platform specific options are deprecated
946 and will be soon removed.
950 config DEBUG_EXYNOS_UART
953 config DEBUG_S3C2410_UART
955 select DEBUG_S3C24XX_UART
957 config DEBUG_S3C24XX_UART
960 config DEBUG_OMAP2PLUS_UART
962 depends on ARCH_OMAP2PLUS
964 config DEBUG_IMX_UART_PORT
965 int "i.MX Debug UART Port Selection" if DEBUG_IMX1_UART || \
966 DEBUG_IMX25_UART || \
967 DEBUG_IMX21_IMX27_UART || \
968 DEBUG_IMX31_UART || \
969 DEBUG_IMX35_UART || \
970 DEBUG_IMX50_UART || \
971 DEBUG_IMX51_UART || \
972 DEBUG_IMX53_UART || \
973 DEBUG_IMX6Q_UART || \
974 DEBUG_IMX6SL_UART || \
979 Choose UART port on which kernel low-level debug messages
982 config DEBUG_VF_UART_PORT
983 int "Vybrid Debug UART Port Selection" if DEBUG_VF_UART
988 Choose UART port on which kernel low-level debug messages
991 config DEBUG_TEGRA_UART
993 depends on ARCH_TEGRA
995 config DEBUG_STI_UART
999 config DEBUG_LL_INCLUDE
1001 default "debug/8250.S" if DEBUG_LL_UART_8250 || DEBUG_UART_8250
1002 default "debug/pl01x.S" if DEBUG_LL_UART_PL01X || DEBUG_UART_PL01X
1003 default "debug/exynos.S" if DEBUG_EXYNOS_UART
1004 default "debug/efm32.S" if DEBUG_LL_UART_EFM32
1005 default "debug/icedcc.S" if DEBUG_ICEDCC
1006 default "debug/imx.S" if DEBUG_IMX1_UART || \
1007 DEBUG_IMX25_UART || \
1008 DEBUG_IMX21_IMX27_UART || \
1009 DEBUG_IMX31_UART || \
1010 DEBUG_IMX35_UART || \
1011 DEBUG_IMX50_UART || \
1012 DEBUG_IMX51_UART || \
1013 DEBUG_IMX53_UART ||\
1014 DEBUG_IMX6Q_UART || \
1015 DEBUG_IMX6SL_UART || \
1017 default "debug/msm.S" if DEBUG_MSM_UART || DEBUG_QCOM_UARTDM
1018 default "debug/omap2plus.S" if DEBUG_OMAP2PLUS_UART
1019 default "debug/s3c24xx.S" if DEBUG_S3C24XX_UART
1020 default "debug/sirf.S" if DEBUG_SIRFPRIMA2_UART1 || DEBUG_SIRFMARCO_UART1
1021 default "debug/sti.S" if DEBUG_STI_UART
1022 default "debug/tegra.S" if DEBUG_TEGRA_UART
1023 default "debug/ux500.S" if DEBUG_UX500_UART
1024 default "debug/vexpress.S" if DEBUG_VEXPRESS_UART0_DETECT
1025 default "debug/vf.S" if DEBUG_VF_UART
1026 default "debug/vt8500.S" if DEBUG_VT8500_UART0
1027 default "debug/zynq.S" if DEBUG_ZYNQ_UART0 || DEBUG_ZYNQ_UART1
1028 default "mach/debug-macro.S"
1030 # Compatibility options for PL01x
1031 config DEBUG_UART_PL01X
1032 def_bool ARCH_EP93XX || \
1033 ARCH_INTEGRATOR || \
1039 # Compatibility options for 8250
1040 config DEBUG_UART_8250
1041 def_bool ARCH_DOVE || ARCH_EBSA110 || \
1042 (FOOTBRIDGE && !DEBUG_DC21285_PORT) || \
1043 ARCH_GEMINI || ARCH_IOP13XX || ARCH_IOP32X || \
1044 ARCH_IOP33X || ARCH_IXP4XX || ARCH_KIRKWOOD || \
1045 ARCH_LPC32XX || ARCH_MV78XX0 || ARCH_ORION5X || ARCH_RPC
1047 config DEBUG_UART_PHYS
1048 hex "Physical base address of debug UART"
1049 default 0x01c20000 if DEBUG_DAVINCI_DMx_UART0
1050 default 0x01c28000 if DEBUG_SUNXI_UART0
1051 default 0x01c28400 if DEBUG_SUNXI_UART1
1052 default 0x01d0c000 if DEBUG_DAVINCI_DA8XX_UART1
1053 default 0x01d0d000 if DEBUG_DAVINCI_DA8XX_UART2
1054 default 0x02530c00 if DEBUG_KEYSTONE_UART0
1055 default 0x02531000 if DEBUG_KEYSTONE_UART1
1056 default 0x03010fe0 if ARCH_RPC
1057 default 0x10009000 if DEBUG_REALVIEW_STD_PORT || DEBUG_CNS3XXX || \
1058 DEBUG_VEXPRESS_UART0_CA9
1059 default 0x1010c000 if DEBUG_REALVIEW_PB1176_PORT
1060 default 0x10124000 if DEBUG_RK3X_UART0
1061 default 0x10126000 if DEBUG_RK3X_UART1
1062 default 0x101f1000 if ARCH_VERSATILE
1063 default 0x101fb000 if DEBUG_NOMADIK_UART
1064 default 0x16000000 if ARCH_INTEGRATOR
1065 default 0x18000300 if DEBUG_BCM_5301X
1066 default 0x1c090000 if DEBUG_VEXPRESS_UART0_RS1
1067 default 0x20060000 if DEBUG_RK29_UART0
1068 default 0x20064000 if DEBUG_RK29_UART1 || DEBUG_RK3X_UART2
1069 default 0x20068000 if DEBUG_RK29_UART2 || DEBUG_RK3X_UART3
1070 default 0x20201000 if DEBUG_BCM2835
1071 default 0x3e000000 if DEBUG_BCM_KONA_UART
1072 default 0x4000e400 if DEBUG_LL_UART_EFM32
1073 default 0x40090000 if ARCH_LPC32XX
1074 default 0x40100000 if DEBUG_PXA_UART1
1075 default 0x42000000 if ARCH_GEMINI
1076 default 0x50000000 if DEBUG_S3C24XX_UART && (DEBUG_S3C_UART0 || \
1077 DEBUG_S3C2410_UART0)
1078 default 0x50004000 if DEBUG_S3C24XX_UART && (DEBUG_S3C_UART1 || \
1079 DEBUG_S3C2410_UART1)
1080 default 0x50008000 if DEBUG_S3C24XX_UART && (DEBUG_S3C_UART2 || \
1081 DEBUG_S3C2410_UART2)
1082 default 0x7c0003f8 if FOOTBRIDGE
1083 default 0x80070000 if DEBUG_IMX23_UART
1084 default 0x80074000 if DEBUG_IMX28_UART
1085 default 0x80230000 if DEBUG_PICOXCELL_UART
1086 default 0x808c0000 if ARCH_EP93XX
1087 default 0x90020000 if DEBUG_NSPIRE_CLASSIC_UART || DEBUG_NSPIRE_CX_UART
1088 default 0xa9a00000 if DEBUG_MSM_UART
1089 default 0xb0090000 if DEBUG_VEXPRESS_UART0_CRX
1090 default 0xc0013000 if DEBUG_U300_UART
1091 default 0xc8000000 if ARCH_IXP4XX && !CPU_BIG_ENDIAN
1092 default 0xc8000003 if ARCH_IXP4XX && CPU_BIG_ENDIAN
1093 default 0xd0000000 if ARCH_SPEAR3XX || ARCH_SPEAR6XX
1094 default 0xd0012000 if DEBUG_MVEBU_UART
1095 default 0xd4017000 if DEBUG_MMP_UART2
1096 default 0xd4018000 if DEBUG_MMP_UART3
1097 default 0xe0000000 if ARCH_SPEAR13XX
1098 default 0xf0000be0 if ARCH_EBSA110
1099 default 0xf1012000 if DEBUG_MVEBU_UART_ALTERNATE
1100 default 0xf1012000 if ARCH_DOVE || ARCH_KIRKWOOD || ARCH_MV78XX0 || \
1102 default 0xf7fc9000 if DEBUG_BERLIN_UART
1103 default 0xf8b00000 if DEBUG_HI3716_UART
1104 default 0xf991e000 if DEBUG_QCOM_UARTDM
1105 default 0xfcb00000 if DEBUG_HI3620_UART
1106 default 0xfe800000 if ARCH_IOP32X
1107 default 0xff690000 if DEBUG_RK32_UART2
1108 default 0xffc02000 if DEBUG_SOCFPGA_UART
1109 default 0xffd82340 if ARCH_IOP13XX
1110 default 0xfff36000 if DEBUG_HIGHBANK_UART
1111 default 0xfffff700 if ARCH_IOP33X
1112 depends on DEBUG_LL_UART_8250 || DEBUG_LL_UART_PL01X || \
1113 DEBUG_LL_UART_EFM32 || \
1114 DEBUG_UART_8250 || DEBUG_UART_PL01X || \
1115 DEBUG_MSM_UART || DEBUG_QCOM_UARTDM || DEBUG_S3C24XX_UART
1117 config DEBUG_UART_VIRT
1118 hex "Virtual base address of debug UART"
1119 default 0xe0010fe0 if ARCH_RPC
1120 default 0xe1000000 if DEBUG_MSM_UART
1121 default 0xf0000be0 if ARCH_EBSA110
1122 default 0xf0009000 if DEBUG_CNS3XXX
1123 default 0xf01fb000 if DEBUG_NOMADIK_UART
1124 default 0xf0201000 if DEBUG_BCM2835
1125 default 0xf1000300 if DEBUG_BCM_5301X
1126 default 0xf11f1000 if ARCH_VERSATILE
1127 default 0xf1600000 if ARCH_INTEGRATOR
1128 default 0xf1c28000 if DEBUG_SUNXI_UART0
1129 default 0xf1c28400 if DEBUG_SUNXI_UART1
1130 default 0xf2100000 if DEBUG_PXA_UART1
1131 default 0xf4090000 if ARCH_LPC32XX
1132 default 0xf4200000 if ARCH_GEMINI
1133 default 0xf7000000 if DEBUG_S3C24XX_UART && (DEBUG_S3C_UART0 || \
1134 DEBUG_S3C2410_UART0)
1135 default 0xf7004000 if DEBUG_S3C24XX_UART && (DEBUG_S3C_UART1 || \
1136 DEBUG_S3C2410_UART1)
1137 default 0xf7008000 if DEBUG_S3C24XX_UART && (DEBUG_S3C_UART2 || \
1138 DEBUG_S3C2410_UART2)
1139 default 0xf7fc9000 if DEBUG_BERLIN_UART
1140 default 0xf8009000 if DEBUG_VEXPRESS_UART0_CA9
1141 default 0xf8090000 if DEBUG_VEXPRESS_UART0_RS1
1142 default 0xfa71e000 if DEBUG_QCOM_UARTDM
1143 default 0xfb009000 if DEBUG_REALVIEW_STD_PORT
1144 default 0xfb10c000 if DEBUG_REALVIEW_PB1176_PORT
1145 default 0xfd000000 if ARCH_SPEAR3XX || ARCH_SPEAR6XX
1146 default 0xfd000000 if ARCH_SPEAR13XX
1147 default 0xfd012000 if ARCH_MV78XX0
1148 default 0xfde12000 if ARCH_DOVE
1149 default 0xfe012000 if ARCH_ORION5X
1150 default 0xfe017000 if DEBUG_MMP_UART2
1151 default 0xfe018000 if DEBUG_MMP_UART3
1152 default 0xfe100000 if DEBUG_IMX23_UART || DEBUG_IMX28_UART
1153 default 0xfe230000 if DEBUG_PICOXCELL_UART
1154 default 0xfe300000 if DEBUG_BCM_KONA_UART
1155 default 0xfe800000 if ARCH_IOP32X
1156 default 0xfeb00000 if DEBUG_HI3620_UART || DEBUG_HI3716_UART
1157 default 0xfeb24000 if DEBUG_RK3X_UART0
1158 default 0xfeb26000 if DEBUG_RK3X_UART1
1159 default 0xfeb30c00 if DEBUG_KEYSTONE_UART0
1160 default 0xfeb31000 if DEBUG_KEYSTONE_UART1
1161 default 0xfec02000 if DEBUG_SOCFPGA_UART
1162 default 0xfec12000 if DEBUG_MVEBU_UART || DEBUG_MVEBU_UART_ALTERNATE
1163 default 0xfec20000 if DEBUG_DAVINCI_DMx_UART0
1164 default 0xfec90000 if DEBUG_RK32_UART2
1165 default 0xfed0c000 if DEBUG_DAVINCI_DA8XX_UART1
1166 default 0xfed0d000 if DEBUG_DAVINCI_DA8XX_UART2
1167 default 0xfed12000 if ARCH_KIRKWOOD
1168 default 0xfed60000 if DEBUG_RK29_UART0
1169 default 0xfed64000 if DEBUG_RK29_UART1 || DEBUG_RK3X_UART2
1170 default 0xfed68000 if DEBUG_RK29_UART2 || DEBUG_RK3X_UART3
1171 default 0xfedc0000 if ARCH_EP93XX
1172 default 0xfee003f8 if FOOTBRIDGE
1173 default 0xfee20000 if DEBUG_NSPIRE_CLASSIC_UART || DEBUG_NSPIRE_CX_UART
1174 default 0xfee82340 if ARCH_IOP13XX
1175 default 0xfef00000 if ARCH_IXP4XX && !CPU_BIG_ENDIAN
1176 default 0xfef00003 if ARCH_IXP4XX && CPU_BIG_ENDIAN
1177 default 0xfef36000 if DEBUG_HIGHBANK_UART
1178 default 0xfefff700 if ARCH_IOP33X
1179 default 0xff003000 if DEBUG_U300_UART
1180 default DEBUG_UART_PHYS if !MMU
1181 depends on DEBUG_LL_UART_8250 || DEBUG_LL_UART_PL01X || \
1182 DEBUG_UART_8250 || DEBUG_UART_PL01X || \
1183 DEBUG_MSM_UART || DEBUG_QCOM_UARTDM || DEBUG_S3C24XX_UART
1185 config DEBUG_UART_8250_SHIFT
1186 int "Register offset shift for the 8250 debug UART"
1187 depends on DEBUG_LL_UART_8250 || DEBUG_UART_8250
1188 default 0 if FOOTBRIDGE || ARCH_IOP32X
1191 config DEBUG_UART_8250_WORD
1192 bool "Use 32-bit accesses for 8250 UART"
1193 depends on DEBUG_LL_UART_8250 || DEBUG_UART_8250
1194 depends on DEBUG_UART_8250_SHIFT >= 2
1195 default y if DEBUG_PICOXCELL_UART || DEBUG_SOCFPGA_UART || \
1197 DEBUG_DAVINCI_DMx_UART0 || DEBUG_DAVINCI_DA8XX_UART1 || \
1198 DEBUG_DAVINCI_DA8XX_UART2 || \
1199 DEBUG_BCM_KONA_UART || DEBUG_RK32_UART2
1201 config DEBUG_UART_8250_FLOW_CONTROL
1202 bool "Enable flow control for 8250 UART"
1203 depends on DEBUG_LL_UART_8250 || DEBUG_UART_8250
1204 default y if ARCH_EBSA110 || FOOTBRIDGE || ARCH_GEMINI || ARCH_RPC
1206 config DEBUG_UNCOMPRESS
1208 depends on ARCH_MULTIPLATFORM || ARCH_MSM || PLAT_SAMSUNG
1209 default y if DEBUG_LL && !DEBUG_OMAP2PLUS_UART && \
1210 (!DEBUG_TEGRA_UART || !ZBOOT_ROM)
1212 This option influences the normal decompressor output for
1213 multiplatform kernels. Normally, multiplatform kernels disable
1214 decompressor output because it is not possible to know where to
1215 send the decompressor output.
1217 When this option is set, the selected DEBUG_LL output method
1218 will be re-used for normal decompressor output on multiplatform
1222 config UNCOMPRESS_INCLUDE
1224 default "debug/uncompress.h" if ARCH_MULTIPLATFORM || ARCH_MSM || \
1225 PLAT_SAMSUNG || ARCH_EFM32
1226 default "mach/uncompress.h"
1232 Say Y here if you want to have an early console using the
1233 kernel low-level debugging functions. Add earlyprintk to your
1234 kernel parameters to enable this console.
1237 bool "On-chip ETM and ETB"
1240 Enables the on-chip embedded trace macrocell and embedded trace
1241 buffer driver that will allow you to collect traces of the
1244 config ARM_KPROBES_TEST
1245 tristate "Kprobes test module"
1246 depends on KPROBES && MODULES
1248 Perform tests of kprobes API and instruction set simulation.
1250 config PID_IN_CONTEXTIDR
1251 bool "Write the current PID to the CONTEXTIDR register"
1252 depends on CPU_COPY_V6
1254 Enabling this option causes the kernel to write the current PID to
1255 the PROCID field of the CONTEXTIDR register, at the expense of some
1256 additional instructions during context switch. Say Y here only if you
1257 are planning to use hardware trace tools with this kernel.
1259 config DEBUG_SET_MODULE_RONX
1260 bool "Set loadable kernel module data as NX and text as RO"
1263 This option helps catch unintended modifications to loadable
1264 kernel module's text and read-only data. It also prevents execution
1265 of module data. Such protection may interfere with run-time code
1266 patching and dynamic kernel tracing - and they might also protect
1267 against certain classes of kernel exploits.
1268 If in doubt, say "N".