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_KEYSTONE_UART0
321 bool "Kernel low-level debugging on KEYSTONE2 using UART0"
322 depends on ARCH_KEYSTONE
323 select DEBUG_UART_8250
325 Say Y here if you want the debug print routines to direct
326 their output to UART0 serial port on KEYSTONE2 devices.
328 config DEBUG_KEYSTONE_UART1
329 bool "Kernel low-level debugging on KEYSTONE2 using UART1"
330 depends on ARCH_KEYSTONE
331 select DEBUG_UART_8250
333 Say Y here if you want the debug print routines to direct
334 their output to UART1 serial port on KEYSTONE2 devices.
336 config DEBUG_MMP_UART2
337 bool "Kernel low-level debugging message via MMP UART2"
339 select DEBUG_UART_8250
341 Say Y here if you want kernel low-level debugging support
344 config DEBUG_MMP_UART3
345 bool "Kernel low-level debugging message via MMP UART3"
347 select DEBUG_UART_8250
349 Say Y here if you want kernel low-level debugging support
352 config DEBUG_MSM_UART1
353 bool "Kernel low-level debugging messages via MSM UART1"
354 depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50
355 select DEBUG_MSM_UART
357 Say Y here if you want the debug print routines to direct
358 their output to the first serial port on MSM devices.
360 config DEBUG_MSM_UART2
361 bool "Kernel low-level debugging messages via MSM UART2"
362 depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50
363 select DEBUG_MSM_UART
365 Say Y here if you want the debug print routines to direct
366 their output to the second serial port on MSM devices.
368 config DEBUG_MSM_UART3
369 bool "Kernel low-level debugging messages via MSM UART3"
370 depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50
371 select DEBUG_MSM_UART
373 Say Y here if you want the debug print routines to direct
374 their output to the third serial port on MSM devices.
376 config DEBUG_MSM8660_UART
377 bool "Kernel low-level debugging messages via MSM 8660 UART"
378 depends on ARCH_MSM8X60
379 select MSM_HAS_DEBUG_UART_HS
380 select DEBUG_MSM_UART
382 Say Y here if you want the debug print routines to direct
383 their output to the serial port on MSM 8660 devices.
385 config DEBUG_MSM8960_UART
386 bool "Kernel low-level debugging messages via MSM 8960 UART"
387 depends on ARCH_MSM8960
388 select MSM_HAS_DEBUG_UART_HS
389 select DEBUG_MSM_UART
391 Say Y here if you want the debug print routines to direct
392 their output to the serial port on MSM 8960 devices.
394 config DEBUG_MSM8974_UART
395 bool "Kernel low-level debugging messages via MSM 8974 UART"
396 depends on ARCH_MSM8974
397 select MSM_HAS_DEBUG_UART_HS
398 select DEBUG_MSM_UART
400 Say Y here if you want the debug print routines to direct
401 their output to the serial port on MSM 8974 devices.
403 config DEBUG_MVEBU_UART
404 bool "Kernel low-level debugging messages via MVEBU UART (old bootloaders)"
405 depends on ARCH_MVEBU
406 select DEBUG_UART_8250
408 Say Y here if you want kernel low-level debugging support
409 on MVEBU based platforms.
411 This option should be used with the old bootloaders
412 that left the internal registers mapped at
413 0xd0000000. As of today, this is the case on
414 platforms such as the Globalscale Mirabox or the
415 Plathome OpenBlocks AX3, when using the original
418 If the wrong DEBUG_MVEBU_UART* option is selected,
419 when u-boot hands over to the kernel, the system
420 silently crashes, with no serial output at all.
422 config DEBUG_MVEBU_UART_ALTERNATE
423 bool "Kernel low-level debugging messages via MVEBU UART (new bootloaders)"
424 depends on ARCH_MVEBU
425 select DEBUG_UART_8250
427 Say Y here if you want kernel low-level debugging support
428 on MVEBU based platforms.
430 This option should be used with the new bootloaders
431 that remap the internal registers at 0xf1000000.
433 If the wrong DEBUG_MVEBU_UART* option is selected,
434 when u-boot hands over to the kernel, the system
435 silently crashes, with no serial output at all.
441 Say Y here if you want kernel low-level debugging support
442 on Vybrid based platforms.
444 config DEBUG_NOMADIK_UART
445 bool "Kernel low-level debugging messages via NOMADIK UART"
446 depends on ARCH_NOMADIK
447 select DEBUG_UART_PL01X
449 Say Y here if you want kernel low-level debugging support
450 on NOMADIK based platforms.
452 config DEBUG_NSPIRE_CLASSIC_UART
453 bool "Kernel low-level debugging via TI-NSPIRE 8250 UART"
454 depends on ARCH_NSPIRE
455 select DEBUG_UART_8250
457 Say Y here if you want kernel low-level debugging support
458 on TI-NSPIRE classic models.
460 config DEBUG_NSPIRE_CX_UART
461 bool "Kernel low-level debugging via TI-NSPIRE PL011 UART"
462 depends on ARCH_NSPIRE
463 select DEBUG_UART_PL01X
465 Say Y here if you want kernel low-level debugging support
466 on TI-NSPIRE CX models.
468 config DEBUG_OMAP2UART1
469 bool "OMAP2/3/4 UART1 (omap2/3 sdp boards and some omap3 boards)"
470 depends on ARCH_OMAP2PLUS
471 select DEBUG_OMAP2PLUS_UART
473 This covers at least h4, 2430sdp, 3430sdp, 3630sdp,
474 omap3 torpedo and 3530 lv som.
476 config DEBUG_OMAP2UART2
477 bool "Kernel low-level debugging messages via OMAP2/3/4 UART2"
478 depends on ARCH_OMAP2PLUS
479 select DEBUG_OMAP2PLUS_UART
481 config DEBUG_OMAP2UART3
482 bool "Kernel low-level debugging messages via OMAP2 UART3 (n8x0)"
483 depends on ARCH_OMAP2PLUS
484 select DEBUG_OMAP2PLUS_UART
486 config DEBUG_OMAP3UART3
487 bool "Kernel low-level debugging messages via OMAP3 UART3 (most omap3 boards)"
488 depends on ARCH_OMAP2PLUS
489 select DEBUG_OMAP2PLUS_UART
491 This covers at least cm_t3x, beagle, crane, devkit8000,
492 igep00x0, ldp, n900, n9(50), pandora, overo, touchbook,
495 config DEBUG_OMAP4UART3
496 bool "Kernel low-level debugging messages via OMAP4/5 UART3 (omap4 blaze, panda, omap5 sevm)"
497 depends on ARCH_OMAP2PLUS
498 select DEBUG_OMAP2PLUS_UART
500 config DEBUG_OMAP3UART4
501 bool "Kernel low-level debugging messages via OMAP36XX UART4"
502 depends on ARCH_OMAP2PLUS
503 select DEBUG_OMAP2PLUS_UART
505 config DEBUG_OMAP4UART4
506 bool "Kernel low-level debugging messages via OMAP4/5 UART4"
507 depends on ARCH_OMAP2PLUS
508 select DEBUG_OMAP2PLUS_UART
510 config DEBUG_TI81XXUART1
511 bool "Kernel low-level debugging messages via TI81XX UART1 (ti8148evm)"
512 depends on ARCH_OMAP2PLUS
513 select DEBUG_OMAP2PLUS_UART
515 config DEBUG_TI81XXUART2
516 bool "Kernel low-level debugging messages via TI81XX UART2"
517 depends on ARCH_OMAP2PLUS
518 select DEBUG_OMAP2PLUS_UART
520 config DEBUG_TI81XXUART3
521 bool "Kernel low-level debugging messages via TI81XX UART3 (ti8168evm)"
522 depends on ARCH_OMAP2PLUS
523 select DEBUG_OMAP2PLUS_UART
525 config DEBUG_AM33XXUART1
526 bool "Kernel low-level debugging messages via AM33XX UART1"
527 depends on ARCH_OMAP2PLUS
528 select DEBUG_OMAP2PLUS_UART
530 config DEBUG_ZOOM_UART
531 bool "Kernel low-level debugging messages via Zoom2/3 UART"
532 depends on ARCH_OMAP2PLUS
533 select DEBUG_OMAP2PLUS_UART
535 config DEBUG_PICOXCELL_UART
536 depends on ARCH_PICOXCELL
537 bool "Use PicoXcell UART for low-level debug"
538 select DEBUG_UART_8250
540 Say Y here if you want kernel low-level debugging support
541 on PicoXcell based platforms.
543 config DEBUG_PXA_UART1
545 bool "Use PXA UART1 for low-level debug"
546 select DEBUG_UART_8250
548 Say Y here if you want kernel low-level debugging support
551 config DEBUG_REALVIEW_STD_PORT
552 bool "RealView Default UART"
553 depends on ARCH_REALVIEW
554 select DEBUG_UART_PL01X
556 Say Y here if you want the debug print routines to direct
557 their output to the serial port on RealView EB, PB11MP, PBA8
560 config DEBUG_REALVIEW_PB1176_PORT
561 bool "RealView PB1176 UART"
562 depends on MACH_REALVIEW_PB1176
563 select DEBUG_UART_PL01X
565 Say Y here if you want the debug print routines to direct
566 their output to the standard serial port on the RealView
569 config DEBUG_RK29_UART0
570 bool "Kernel low-level debugging messages via Rockchip RK29 UART0"
571 depends on ARCH_ROCKCHIP
572 select DEBUG_UART_8250
574 Say Y here if you want kernel low-level debugging support
575 on Rockchip based platforms.
577 config DEBUG_RK29_UART1
578 bool "Kernel low-level debugging messages via Rockchip RK29 UART1"
579 depends on ARCH_ROCKCHIP
580 select DEBUG_UART_8250
582 Say Y here if you want kernel low-level debugging support
583 on Rockchip based platforms.
585 config DEBUG_RK29_UART2
586 bool "Kernel low-level debugging messages via Rockchip RK29 UART2"
587 depends on ARCH_ROCKCHIP
588 select DEBUG_UART_8250
590 Say Y here if you want kernel low-level debugging support
591 on Rockchip based platforms.
593 config DEBUG_RK3X_UART0
594 bool "Kernel low-level debugging messages via Rockchip RK3X UART0"
595 depends on ARCH_ROCKCHIP
596 select DEBUG_UART_8250
598 Say Y here if you want kernel low-level debugging support
599 on Rockchip based platforms.
601 config DEBUG_RK3X_UART1
602 bool "Kernel low-level debugging messages via Rockchip RK3X UART1"
603 depends on ARCH_ROCKCHIP
604 select DEBUG_UART_8250
606 Say Y here if you want kernel low-level debugging support
607 on Rockchip based platforms.
609 config DEBUG_RK3X_UART2
610 bool "Kernel low-level debugging messages via Rockchip RK3X UART2"
611 depends on ARCH_ROCKCHIP
612 select DEBUG_UART_8250
614 Say Y here if you want kernel low-level debugging support
615 on Rockchip based platforms.
617 config DEBUG_RK3X_UART3
618 bool "Kernel low-level debugging messages via Rockchip RK3X UART3"
619 depends on ARCH_ROCKCHIP
620 select DEBUG_UART_8250
622 Say Y here if you want kernel low-level debugging support
623 on Rockchip based platforms.
625 config DEBUG_S3C_UART0
626 depends on PLAT_SAMSUNG
627 select DEBUG_EXYNOS_UART if ARCH_EXYNOS
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 bool "Use S3C UART 1 for low-level debug"
642 Say Y here if you want the debug print routines to direct
643 their output to UART 1. The port must have been initialised
644 by the boot-loader before use.
646 The uncompressor code port configuration is now handled
647 by CONFIG_S3C_LOWLEVEL_UART_PORT.
649 config DEBUG_S3C_UART2
650 depends on PLAT_SAMSUNG
651 select DEBUG_EXYNOS_UART if ARCH_EXYNOS
652 bool "Use S3C UART 2 for low-level debug"
654 Say Y here if you want the debug print routines to direct
655 their output to UART 2. The port must have been initialised
656 by the boot-loader before use.
658 The uncompressor code port configuration is now handled
659 by CONFIG_S3C_LOWLEVEL_UART_PORT.
661 config DEBUG_S3C_UART3
662 depends on PLAT_SAMSUNG && ARCH_EXYNOS
663 select DEBUG_EXYNOS_UART
664 bool "Use S3C UART 3 for low-level debug"
666 Say Y here if you want the debug print routines to direct
667 their output to UART 3. The port must have been initialised
668 by the boot-loader before use.
670 The uncompressor code port configuration is now handled
671 by CONFIG_S3C_LOWLEVEL_UART_PORT.
673 config DEBUG_S3C2410_UART0
674 depends on ARCH_S3C24XX
675 select DEBUG_S3C2410_UART
676 bool "Use S3C2410/S3C2412 UART 0 for low-level debug"
678 Say Y here if you want the debug print routines to direct
679 their output to UART 0. The port must have been initialised
680 by the boot-loader before use.
682 config DEBUG_S3C2410_UART1
683 depends on ARCH_S3C24XX
684 select DEBUG_S3C2410_UART
685 bool "Use S3C2410/S3C2412 UART 1 for low-level debug"
687 Say Y here if you want the debug print routines to direct
688 their output to UART 1. The port must have been initialised
689 by the boot-loader before use.
691 config DEBUG_S3C2410_UART2
692 depends on ARCH_S3C24XX
693 select DEBUG_S3C2410_UART
694 bool "Use S3C2410/S3C2412 UART 2 for low-level debug"
696 Say Y here if you want the debug print routines to direct
697 their output to UART 2. The port must have been initialised
698 by the boot-loader before use.
700 config DEBUG_SOCFPGA_UART
701 depends on ARCH_SOCFPGA
702 bool "Use SOCFPGA UART for low-level debug"
703 select DEBUG_UART_8250
705 Say Y here if you want kernel low-level debugging support
706 on SOCFPGA based platforms.
708 config DEBUG_SUNXI_UART0
709 bool "Kernel low-level debugging messages via sunXi UART0"
710 depends on ARCH_SUNXI
711 select DEBUG_UART_8250
713 Say Y here if you want kernel low-level debugging support
714 on Allwinner A1X based platforms on the UART0.
716 config DEBUG_SUNXI_UART1
717 bool "Kernel low-level debugging messages via sunXi UART1"
718 depends on ARCH_SUNXI
719 select DEBUG_UART_8250
721 Say Y here if you want kernel low-level debugging support
722 on Allwinner A1X based platforms on the UART1.
724 config TEGRA_DEBUG_UART_AUTO_ODMDATA
725 bool "Kernel low-level debugging messages via Tegra UART via ODMDATA"
726 depends on ARCH_TEGRA
727 select DEBUG_TEGRA_UART
729 Automatically determines which UART to use for low-level
730 debug based on the ODMDATA value. This value is part of
731 the BCT, and is written to the boot memory device using
732 nvflash, or other flashing tool. When bits 19:18 are 3,
733 then bits 17:15 indicate which UART to use; 0/1/2/3/4
736 config TEGRA_DEBUG_UARTA
737 bool "Kernel low-level debugging messages via Tegra UART A"
738 depends on ARCH_TEGRA
739 select DEBUG_TEGRA_UART
741 Say Y here if you want kernel low-level debugging support
742 on Tegra based platforms.
744 config TEGRA_DEBUG_UARTB
745 bool "Kernel low-level debugging messages via Tegra UART B"
746 depends on ARCH_TEGRA
747 select DEBUG_TEGRA_UART
749 Say Y here if you want kernel low-level debugging support
750 on Tegra based platforms.
752 config TEGRA_DEBUG_UARTC
753 bool "Kernel low-level debugging messages via Tegra UART C"
754 depends on ARCH_TEGRA
755 select DEBUG_TEGRA_UART
757 Say Y here if you want kernel low-level debugging support
758 on Tegra based platforms.
760 config TEGRA_DEBUG_UARTD
761 bool "Kernel low-level debugging messages via Tegra UART D"
762 depends on ARCH_TEGRA
763 select DEBUG_TEGRA_UART
765 Say Y here if you want kernel low-level debugging support
766 on Tegra based platforms.
768 config TEGRA_DEBUG_UARTE
769 bool "Kernel low-level debugging messages via Tegra UART E"
770 depends on ARCH_TEGRA
771 select DEBUG_TEGRA_UART
773 Say Y here if you want kernel low-level debugging support
774 on Tegra based platforms.
776 config DEBUG_SIRFPRIMA2_UART1
777 bool "Kernel low-level debugging messages via SiRFprimaII UART1"
778 depends on ARCH_PRIMA2
780 Say Y here if you want the debug print routines to direct
781 their output to the uart1 port on SiRFprimaII devices.
783 config DEBUG_SIRFMARCO_UART1
784 bool "Kernel low-level debugging messages via SiRFmarco UART1"
785 depends on ARCH_MARCO
787 Say Y here if you want the debug print routines to direct
788 their output to the uart1 port on SiRFmarco devices.
790 config STIH41X_DEBUG_ASC2
791 bool "Use StiH415/416 ASC2 UART for low-level debug"
793 select DEBUG_STI_UART
795 Say Y here if you want kernel low-level debugging support
796 on STiH415/416 based platforms like b2000, which has
797 default UART wired up to ASC2.
801 config STIH41X_DEBUG_SBC_ASC1
802 bool "Use StiH415/416 SBC ASC1 UART for low-level debug"
804 select DEBUG_STI_UART
806 Say Y here if you want kernel low-level debugging support
807 on STiH415/416 based platforms like b2020. which has
808 default UART wired up to SBC ASC1.
812 config DEBUG_U300_UART
813 bool "Kernel low-level debugging messages via U300 UART0"
815 select DEBUG_UART_PL01X
817 Say Y here if you want the debug print routines to direct
818 their output to the uart port on U300 devices.
820 config DEBUG_UX500_UART
821 depends on ARCH_U8500
822 bool "Use Ux500 UART for low-level debug"
824 Say Y here if you want kernel low-level debugging support
825 on Ux500 based platforms.
827 config DEBUG_VEXPRESS_UART0_DETECT
828 bool "Autodetect UART0 on Versatile Express Cortex-A core tiles"
829 depends on ARCH_VEXPRESS && CPU_CP15_MMU
831 This option enables a simple heuristic which tries to determine
832 the motherboard's memory map variant (original or RS1) and then
833 choose the relevant UART0 base address.
835 Note that this will only work with standard A-class core tiles,
836 and may fail with non-standard SMM or custom software models.
838 config DEBUG_VEXPRESS_UART0_CA9
839 bool "Use PL011 UART0 at 0x10009000 (V2P-CA9 core tile)"
840 depends on ARCH_VEXPRESS
841 select DEBUG_UART_PL01X
843 This option selects UART0 at 0x10009000. Except for custom models,
844 this applies only to the V2P-CA9 tile.
846 config DEBUG_VEXPRESS_UART0_RS1
847 bool "Use PL011 UART0 at 0x1c090000 (RS1 complaint tiles)"
848 depends on ARCH_VEXPRESS
849 select DEBUG_UART_PL01X
851 This option selects UART0 at 0x1c090000. This applies to most
852 of the tiles using the RS1 memory map, including all new A-class
853 core tiles, FPGA-based SMMs and software models.
855 config DEBUG_VEXPRESS_UART0_CRX
856 bool "Use PL011 UART0 at 0xb0090000 (Cortex-R compliant tiles)"
857 depends on ARCH_VEXPRESS && !MMU
858 select DEBUG_UART_PL01X
860 This option selects UART0 at 0xb0090000. This is appropriate for
861 Cortex-R series tiles and SMMs, such as Cortex-R5 and Cortex-R7
863 config DEBUG_VT8500_UART0
864 bool "Use UART0 on VIA/Wondermedia SoCs"
865 depends on ARCH_VT8500
867 This option selects UART0 on VIA/Wondermedia System-on-a-chip
868 devices, including VT8500, WM8505, WM8650 and WM8850.
870 config DEBUG_LL_UART_NONE
871 bool "No low-level debugging UART"
872 depends on !ARCH_MULTIPLATFORM
874 Say Y here if your platform doesn't provide a UART option
875 above. This relies on your platform choosing the right UART
876 definition internally in order for low-level debugging to
880 bool "Kernel low-level debugging via EmbeddedICE DCC channel"
882 Say Y here if you want the debug print routines to direct
883 their output to the EmbeddedICE macrocell's DCC channel using
884 co-processor 14. This is known to work on the ARM9 style ICE
885 channel and on the XScale with the PEEDI.
887 Note that the system will appear to hang during boot if there
888 is nothing connected to read from the DCC.
890 config DEBUG_SEMIHOSTING
891 bool "Kernel low-level debug output via semihosting I/O"
893 Semihosting enables code running on an ARM target to use
894 the I/O facilities on a host debugger/emulator through a
895 simple SVC call. The host debugger or emulator must have
896 semihosting enabled for the special svc call to be trapped
897 otherwise the kernel will crash.
899 This is known to work with OpenOCD, as well as
900 ARM's Fast Models, or any other controlling environment
901 that implements semihosting.
903 For more details about semihosting, please see
904 chapter 8 of DUI0203I_rvct_developer_guide.pdf from ARM Ltd.
906 config DEBUG_LL_UART_8250
907 bool "Kernel low-level debugging via 8250 UART"
909 Say Y here if you wish the debug print routes to direct
910 their output to an 8250 UART. You can use this option
911 to provide the parameters for the 8250 UART rather than
912 selecting one of the platform specific options above if
913 you know the parameters for the port.
915 This option is preferred over the platform specific
916 options; the platform specific options are deprecated
917 and will be soon removed.
919 config DEBUG_LL_UART_EFM32
920 bool "Kernel low-level debugging via efm32 UART"
921 depends on ARCH_EFM32
923 Say Y here if you want the debug print routines to direct
924 their output to an UART or USART port on efm32 based
925 machines. Use the following addresses for DEBUG_UART_PHYS:
933 config DEBUG_LL_UART_PL01X
934 bool "Kernel low-level debugging via ARM Ltd PL01x Primecell UART"
936 Say Y here if you wish the debug print routes to direct
937 their output to a PL01x Primecell UART. You can use
938 this option to provide the parameters for the UART
939 rather than selecting one of the platform specific
940 options above if you know the parameters for the port.
942 This option is preferred over the platform specific
943 options; the platform specific options are deprecated
944 and will be soon removed.
948 config DEBUG_EXYNOS_UART
951 config DEBUG_S3C2410_UART
954 config DEBUG_OMAP2PLUS_UART
956 depends on ARCH_OMAP2PLUS
958 config DEBUG_IMX_UART_PORT
959 int "i.MX Debug UART Port Selection" if DEBUG_IMX1_UART || \
960 DEBUG_IMX25_UART || \
961 DEBUG_IMX21_IMX27_UART || \
962 DEBUG_IMX31_UART || \
963 DEBUG_IMX35_UART || \
964 DEBUG_IMX50_UART || \
965 DEBUG_IMX51_UART || \
966 DEBUG_IMX53_UART || \
967 DEBUG_IMX6Q_UART || \
972 Choose UART port on which kernel low-level debug messages
975 config DEBUG_TEGRA_UART
977 depends on ARCH_TEGRA
979 config DEBUG_STI_UART
983 config DEBUG_MSM_UART
985 depends on ARCH_MSM || ARCH_QCOM
987 config DEBUG_LL_INCLUDE
989 default "debug/8250.S" if DEBUG_LL_UART_8250 || DEBUG_UART_8250
990 default "debug/pl01x.S" if DEBUG_LL_UART_PL01X || DEBUG_UART_PL01X
991 default "debug/exynos.S" if DEBUG_EXYNOS_UART
992 default "debug/efm32.S" if DEBUG_LL_UART_EFM32
993 default "debug/icedcc.S" if DEBUG_ICEDCC
994 default "debug/imx.S" if DEBUG_IMX1_UART || \
995 DEBUG_IMX25_UART || \
996 DEBUG_IMX21_IMX27_UART || \
997 DEBUG_IMX31_UART || \
998 DEBUG_IMX35_UART || \
999 DEBUG_IMX50_UART || \
1000 DEBUG_IMX51_UART || \
1001 DEBUG_IMX53_UART ||\
1002 DEBUG_IMX6Q_UART || \
1004 default "debug/msm.S" if DEBUG_MSM_UART
1005 default "debug/omap2plus.S" if DEBUG_OMAP2PLUS_UART
1006 default "debug/sirf.S" if DEBUG_SIRFPRIMA2_UART1 || DEBUG_SIRFMARCO_UART1
1007 default "debug/sti.S" if DEBUG_STI_UART
1008 default "debug/tegra.S" if DEBUG_TEGRA_UART
1009 default "debug/ux500.S" if DEBUG_UX500_UART
1010 default "debug/vexpress.S" if DEBUG_VEXPRESS_UART0_DETECT
1011 default "debug/vf.S" if DEBUG_VF_UART
1012 default "debug/vt8500.S" if DEBUG_VT8500_UART0
1013 default "debug/zynq.S" if DEBUG_ZYNQ_UART0 || DEBUG_ZYNQ_UART1
1014 default "mach/debug-macro.S"
1016 # Compatibility options for PL01x
1017 config DEBUG_UART_PL01X
1018 def_bool ARCH_EP93XX || \
1019 ARCH_INTEGRATOR || \
1025 # Compatibility options for 8250
1026 config DEBUG_UART_8250
1027 def_bool ARCH_DOVE || ARCH_EBSA110 || \
1028 (FOOTBRIDGE && !DEBUG_DC21285_PORT) || \
1029 ARCH_GEMINI || ARCH_IOP13XX || ARCH_IOP32X || \
1030 ARCH_IOP33X || ARCH_IXP4XX || ARCH_KIRKWOOD || \
1031 ARCH_LPC32XX || ARCH_MV78XX0 || ARCH_ORION5X || ARCH_RPC
1033 config DEBUG_UART_PHYS
1034 hex "Physical base address of debug UART"
1035 default 0x01c20000 if DEBUG_DAVINCI_DMx_UART0
1036 default 0x01c28000 if DEBUG_SUNXI_UART0
1037 default 0x01c28400 if DEBUG_SUNXI_UART1
1038 default 0x01d0c000 if DEBUG_DAVINCI_DA8XX_UART1
1039 default 0x01d0d000 if DEBUG_DAVINCI_DA8XX_UART2
1040 default 0x02530c00 if DEBUG_KEYSTONE_UART0
1041 default 0x02531000 if DEBUG_KEYSTONE_UART1
1042 default 0x03010fe0 if ARCH_RPC
1043 default 0x10009000 if DEBUG_REALVIEW_STD_PORT || DEBUG_CNS3XXX || \
1044 DEBUG_VEXPRESS_UART0_CA9
1045 default 0x1010c000 if DEBUG_REALVIEW_PB1176_PORT
1046 default 0x10124000 if DEBUG_RK3X_UART0
1047 default 0x10126000 if DEBUG_RK3X_UART1
1048 default 0x101f1000 if ARCH_VERSATILE
1049 default 0x101fb000 if DEBUG_NOMADIK_UART
1050 default 0x16000000 if ARCH_INTEGRATOR
1051 default 0x18000300 if DEBUG_BCM_5301X
1052 default 0x1c090000 if DEBUG_VEXPRESS_UART0_RS1
1053 default 0x20060000 if DEBUG_RK29_UART0
1054 default 0x20064000 if DEBUG_RK29_UART1 || DEBUG_RK3X_UART2
1055 default 0x20068000 if DEBUG_RK29_UART2 || DEBUG_RK3X_UART3
1056 default 0x20201000 if DEBUG_BCM2835
1057 default 0x3e000000 if DEBUG_BCM_KONA_UART
1058 default 0x4000e400 if DEBUG_LL_UART_EFM32
1059 default 0x40090000 if ARCH_LPC32XX
1060 default 0x40100000 if DEBUG_PXA_UART1
1061 default 0x42000000 if ARCH_GEMINI
1062 default 0x7c0003f8 if FOOTBRIDGE
1063 default 0x80070000 if DEBUG_IMX23_UART
1064 default 0x80074000 if DEBUG_IMX28_UART
1065 default 0x80230000 if DEBUG_PICOXCELL_UART
1066 default 0x808c0000 if ARCH_EP93XX
1067 default 0x90020000 if DEBUG_NSPIRE_CLASSIC_UART || DEBUG_NSPIRE_CX_UART
1068 default 0xb0090000 if DEBUG_VEXPRESS_UART0_CRX
1069 default 0xc0013000 if DEBUG_U300_UART
1070 default 0xc8000000 if ARCH_IXP4XX && !CPU_BIG_ENDIAN
1071 default 0xc8000003 if ARCH_IXP4XX && CPU_BIG_ENDIAN
1072 default 0xd0000000 if ARCH_SPEAR3XX || ARCH_SPEAR6XX
1073 default 0xd0012000 if DEBUG_MVEBU_UART
1074 default 0xd4017000 if DEBUG_MMP_UART2
1075 default 0xd4018000 if DEBUG_MMP_UART3
1076 default 0xe0000000 if ARCH_SPEAR13XX
1077 default 0xf0000be0 if ARCH_EBSA110
1078 default 0xf1012000 if DEBUG_MVEBU_UART_ALTERNATE
1079 default 0xf1012000 if ARCH_DOVE || ARCH_KIRKWOOD || ARCH_MV78XX0 || \
1081 default 0xf7fc9000 if DEBUG_BERLIN_UART
1082 default 0xf8b00000 if DEBUG_HI3716_UART
1083 default 0xfcb00000 if DEBUG_HI3620_UART
1084 default 0xfe800000 if ARCH_IOP32X
1085 default 0xffc02000 if DEBUG_SOCFPGA_UART
1086 default 0xffd82340 if ARCH_IOP13XX
1087 default 0xfff36000 if DEBUG_HIGHBANK_UART
1088 default 0xfffff700 if ARCH_IOP33X
1089 depends on DEBUG_LL_UART_8250 || DEBUG_LL_UART_PL01X || \
1090 DEBUG_LL_UART_EFM32 || \
1091 DEBUG_UART_8250 || DEBUG_UART_PL01X
1093 config DEBUG_UART_VIRT
1094 hex "Virtual base address of debug UART"
1095 default 0xe0010fe0 if ARCH_RPC
1096 default 0xf0000be0 if ARCH_EBSA110
1097 default 0xf0009000 if DEBUG_CNS3XXX
1098 default 0xf01fb000 if DEBUG_NOMADIK_UART
1099 default 0xf0201000 if DEBUG_BCM2835
1100 default 0xf1000300 if DEBUG_BCM_5301X
1101 default 0xf11f1000 if ARCH_VERSATILE
1102 default 0xf1600000 if ARCH_INTEGRATOR
1103 default 0xf1c28000 if DEBUG_SUNXI_UART0
1104 default 0xf1c28400 if DEBUG_SUNXI_UART1
1105 default 0xf2100000 if DEBUG_PXA_UART1
1106 default 0xf4090000 if ARCH_LPC32XX
1107 default 0xf4200000 if ARCH_GEMINI
1108 default 0xf7fc9000 if DEBUG_BERLIN_UART
1109 default 0xf8009000 if DEBUG_VEXPRESS_UART0_CA9
1110 default 0xf8090000 if DEBUG_VEXPRESS_UART0_RS1
1111 default 0xfb009000 if DEBUG_REALVIEW_STD_PORT
1112 default 0xfb10c000 if DEBUG_REALVIEW_PB1176_PORT
1113 default 0xfd000000 if ARCH_SPEAR3XX || ARCH_SPEAR6XX
1114 default 0xfd000000 if ARCH_SPEAR13XX
1115 default 0xfd012000 if ARCH_MV78XX0
1116 default 0xfde12000 if ARCH_DOVE
1117 default 0xfe012000 if ARCH_ORION5X
1118 default 0xfe017000 if DEBUG_MMP_UART2
1119 default 0xfe018000 if DEBUG_MMP_UART3
1120 default 0xfe100000 if DEBUG_IMX23_UART || DEBUG_IMX28_UART
1121 default 0xfe230000 if DEBUG_PICOXCELL_UART
1122 default 0xfe300000 if DEBUG_BCM_KONA_UART
1123 default 0xfe800000 if ARCH_IOP32X
1124 default 0xfeb00000 if DEBUG_HI3620_UART || DEBUG_HI3716_UART
1125 default 0xfeb24000 if DEBUG_RK3X_UART0
1126 default 0xfeb26000 if DEBUG_RK3X_UART1
1127 default 0xfeb30c00 if DEBUG_KEYSTONE_UART0
1128 default 0xfeb31000 if DEBUG_KEYSTONE_UART1
1129 default 0xfec02000 if DEBUG_SOCFPGA_UART
1130 default 0xfec12000 if DEBUG_MVEBU_UART || DEBUG_MVEBU_UART_ALTERNATE
1131 default 0xfec20000 if DEBUG_DAVINCI_DMx_UART0
1132 default 0xfed0c000 if DEBUG_DAVINCI_DA8XX_UART1
1133 default 0xfed0d000 if DEBUG_DAVINCI_DA8XX_UART2
1134 default 0xfed12000 if ARCH_KIRKWOOD
1135 default 0xfed60000 if DEBUG_RK29_UART0
1136 default 0xfed64000 if DEBUG_RK29_UART1 || DEBUG_RK3X_UART2
1137 default 0xfed68000 if DEBUG_RK29_UART2 || DEBUG_RK3X_UART3
1138 default 0xfedc0000 if ARCH_EP93XX
1139 default 0xfee003f8 if FOOTBRIDGE
1140 default 0xfee20000 if DEBUG_NSPIRE_CLASSIC_UART || DEBUG_NSPIRE_CX_UART
1141 default 0xfee82340 if ARCH_IOP13XX
1142 default 0xfef00000 if ARCH_IXP4XX && !CPU_BIG_ENDIAN
1143 default 0xfef00003 if ARCH_IXP4XX && CPU_BIG_ENDIAN
1144 default 0xfef36000 if DEBUG_HIGHBANK_UART
1145 default 0xfefff700 if ARCH_IOP33X
1146 default 0xff003000 if DEBUG_U300_UART
1147 default DEBUG_UART_PHYS if !MMU
1148 depends on DEBUG_LL_UART_8250 || DEBUG_LL_UART_PL01X || \
1149 DEBUG_UART_8250 || DEBUG_UART_PL01X
1151 config DEBUG_UART_8250_SHIFT
1152 int "Register offset shift for the 8250 debug UART"
1153 depends on DEBUG_LL_UART_8250 || DEBUG_UART_8250
1154 default 0 if FOOTBRIDGE || ARCH_IOP32X
1157 config DEBUG_UART_8250_WORD
1158 bool "Use 32-bit accesses for 8250 UART"
1159 depends on DEBUG_LL_UART_8250 || DEBUG_UART_8250
1160 depends on DEBUG_UART_8250_SHIFT >= 2
1161 default y if DEBUG_PICOXCELL_UART || DEBUG_SOCFPGA_UART || \
1163 DEBUG_DAVINCI_DMx_UART0 || DEBUG_DAVINCI_DA8XX_UART1 || \
1164 DEBUG_DAVINCI_DA8XX_UART2 || \
1167 config DEBUG_UART_8250_FLOW_CONTROL
1168 bool "Enable flow control for 8250 UART"
1169 depends on DEBUG_LL_UART_8250 || DEBUG_UART_8250
1170 default y if ARCH_EBSA110 || FOOTBRIDGE || ARCH_GEMINI || ARCH_RPC
1172 config DEBUG_UNCOMPRESS
1174 depends on ARCH_MULTIPLATFORM || ARCH_MSM || PLAT_SAMSUNG
1175 default y if DEBUG_LL && !DEBUG_OMAP2PLUS_UART && \
1176 (!DEBUG_TEGRA_UART || !ZBOOT_ROM)
1178 This option influences the normal decompressor output for
1179 multiplatform kernels. Normally, multiplatform kernels disable
1180 decompressor output because it is not possible to know where to
1181 send the decompressor output.
1183 When this option is set, the selected DEBUG_LL output method
1184 will be re-used for normal decompressor output on multiplatform
1188 config UNCOMPRESS_INCLUDE
1190 default "debug/uncompress.h" if ARCH_MULTIPLATFORM || ARCH_MSM || \
1191 PLAT_SAMSUNG || ARCH_EFM32
1192 default "mach/uncompress.h"
1198 Say Y here if you want to have an early console using the
1199 kernel low-level debugging functions. Add earlyprintk to your
1200 kernel parameters to enable this console.
1203 bool "On-chip ETM and ETB"
1206 Enables the on-chip embedded trace macrocell and embedded trace
1207 buffer driver that will allow you to collect traces of the
1210 config ARM_KPROBES_TEST
1211 tristate "Kprobes test module"
1212 depends on KPROBES && MODULES
1214 Perform tests of kprobes API and instruction set simulation.
1216 config PID_IN_CONTEXTIDR
1217 bool "Write the current PID to the CONTEXTIDR register"
1218 depends on CPU_COPY_V6
1220 Enabling this option causes the kernel to write the current PID to
1221 the PROCID field of the CONTEXTIDR register, at the expense of some
1222 additional instructions during context switch. Say Y here only if you
1223 are planning to use hardware trace tools with this kernel.
1225 config DEBUG_SET_MODULE_RONX
1226 bool "Set loadable kernel module data as NX and text as RO"
1229 This option helps catch unintended modifications to loadable
1230 kernel module's text and read-only data. It also prevents execution
1231 of module data. Such protection may interfere with run-time code
1232 patching and dynamic kernel tracing - and they might also protect
1233 against certain classes of kernel exploits.
1234 If in doubt, say "N".