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Commit | Line | Data |
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1da177e4 LT |
1 | menu "Kernel hacking" |
2 | ||
3 | source "lib/Kconfig.debug" | |
4 | ||
087aaffc NP |
5 | config STRICT_DEVMEM |
6 | bool "Filter access to /dev/mem" | |
7 | depends on MMU | |
8 | ---help--- | |
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. | |
13 | ||
14 | If this option is switched on, the /dev/mem file only allows | |
15 | userspace access to memory mapped peripherals. | |
16 | ||
17 | If in doubt, say Y. | |
18 | ||
adf8b37b | 19 | # RMK wants arm kernels compiled with frame pointers or stack unwinding. |
1da177e4 LT |
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 ;). | |
23 | config FRAME_POINTER | |
24 | bool | |
16c79651 | 25 | depends on !THUMB2_KERNEL |
0e341af8 | 26 | default y if !ARM_UNWIND || FUNCTION_GRAPH_TRACER |
1da177e4 LT |
27 | help |
28 | If you say N here, the resulting kernel will be slightly smaller and | |
adf8b37b CM |
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. | |
32 | ||
33 | config ARM_UNWIND | |
4a50bfe3 | 34 | bool "Enable stack unwinding support (EXPERIMENTAL)" |
adf8b37b CM |
35 | depends on AEABI && EXPERIMENTAL |
36 | default y | |
37 | help | |
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. | |
1da177e4 | 43 | |
09bfafac RV |
44 | config OLD_MCOUNT |
45 | bool | |
46 | depends on FUNCTION_TRACER && FRAME_POINTER | |
47 | default y | |
48 | ||
1da177e4 LT |
49 | config DEBUG_USER |
50 | bool "Verbose user fault messages" | |
51 | help | |
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. | |
56 | ||
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: | |
59 | ||
60 | 1 - undefined instruction events | |
61 | 2 - system calls | |
62 | 4 - invalid data aborts | |
63 | 8 - SIGSEGV faults | |
64 | 16 - SIGBUS faults | |
65 | ||
1da177e4 LT |
66 | # These options are only for real kernel hackers who want to get their hands dirty. |
67 | config DEBUG_LL | |
4f5ef922 | 68 | bool "Kernel low-level debugging functions (read help!)" |
1da177e4 LT |
69 | depends on DEBUG_KERNEL |
70 | help | |
35efb606 | 71 | Say Y here to include definitions of printascii, printch, printhex |
1da177e4 LT |
72 | in the kernel. This is helpful if you are debugging code that |
73 | executes before the console is initialized. | |
74 | ||
4f5ef922 WD |
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. | |
79 | ||
17916b28 WD |
80 | choice |
81 | prompt "Kernel low-level debugging port" | |
82 | depends on DEBUG_LL | |
83 | ||
13079a73 JCPV |
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 | |
87 | ||
88 | config AT91_DEBUG_LL_DBGU1 | |
9918ceaf | 89 | bool "Kernel low-level debugging on 9263 and 9g45" |
13079a73 JCPV |
90 | depends on HAVE_AT91_DBGU1 |
91 | ||
164acf96 SB |
92 | config DEBUG_CLPS711X_UART1 |
93 | bool "Kernel low-level debugging messages via UART1" | |
94 | depends on ARCH_CLPS711X | |
95 | help | |
96 | Say Y here if you want the debug print routines to direct | |
97 | their output to the first serial port on these devices. | |
17916b28 WD |
98 | |
99 | config DEBUG_CLPS711X_UART2 | |
100 | bool "Kernel low-level debugging messages via UART2" | |
101 | depends on ARCH_CLPS711X | |
102 | help | |
103 | Say Y here if you want the debug print routines to direct | |
104 | their output to the second serial port on these devices. | |
17916b28 | 105 | |
477099f1 UKK |
106 | config DEBUG_DAVINCI_DA8XX_UART1 |
107 | bool "Kernel low-level debugging on DaVinci DA8XX using UART1" | |
108 | depends on ARCH_DAVINCI_DA8XX | |
109 | help | |
110 | Say Y here if you want the debug print routines to direct | |
111 | their output to UART1 serial port on DaVinci DA8XX devices. | |
112 | ||
113 | config DEBUG_DAVINCI_DA8XX_UART2 | |
114 | bool "Kernel low-level debugging on DaVinci DA8XX using UART2" | |
115 | depends on ARCH_DAVINCI_DA8XX | |
116 | help | |
117 | Say Y here if you want the debug print routines to direct | |
118 | their output to UART2 serial port on DaVinci DA8XX devices. | |
119 | ||
120 | config DEBUG_DAVINCI_DMx_UART0 | |
121 | bool "Kernel low-level debugging on DaVinci DMx using UART0" | |
122 | depends on ARCH_DAVINCI_DMx | |
123 | help | |
124 | Say Y here if you want the debug print routines to direct | |
125 | their output to UART0 serial port on DaVinci DMx devices. | |
126 | ||
127 | config DEBUG_DAVINCI_TNETV107X_UART1 | |
128 | bool "Kernel low-level debugging on DaVinci TNETV107x using UART1" | |
129 | depends on ARCH_DAVINCI_TNETV107X | |
130 | help | |
131 | Say Y here if you want the debug print routines to direct | |
132 | their output to UART1 serial port on DaVinci TNETV107X | |
133 | devices. | |
134 | ||
e76f4750 RK |
135 | config DEBUG_DC21285_PORT |
136 | bool "Kernel low-level debugging messages via footbridge serial port" | |
137 | depends on FOOTBRIDGE | |
138 | help | |
139 | Say Y here if you want the debug print routines to direct | |
140 | their output to the serial port in the DC21285 (Footbridge). | |
141 | ||
142 | config DEBUG_FOOTBRIDGE_COM1 | |
143 | bool "Kernel low-level debugging messages via footbridge 8250 at PCI COM1" | |
144 | depends on FOOTBRIDGE | |
145 | help | |
146 | Say Y here if you want the debug print routines to direct | |
147 | their output to the 8250 at PCI COM1. | |
148 | ||
220e6cf7 RH |
149 | config DEBUG_HIGHBANK_UART |
150 | bool "Kernel low-level debugging messages via Highbank UART" | |
151 | depends on ARCH_HIGHBANK | |
152 | help | |
153 | Say Y here if you want the debug print routines to direct | |
154 | their output to the UART on Highbank based devices. | |
155 | ||
f350b861 SG |
156 | config DEBUG_IMX1_UART |
157 | bool "i.MX1 Debug UART" | |
158 | depends on SOC_IMX1 | |
159 | help | |
160 | Say Y here if you want kernel low-level debugging support | |
161 | on i.MX1. | |
162 | ||
163 | config DEBUG_IMX23_UART | |
164 | bool "i.MX23 Debug UART" | |
165 | depends on SOC_IMX23 | |
166 | help | |
167 | Say Y here if you want kernel low-level debugging support | |
168 | on i.MX23. | |
169 | ||
170 | config DEBUG_IMX25_UART | |
171 | bool "i.MX25 Debug UART" | |
172 | depends on SOC_IMX25 | |
173 | help | |
174 | Say Y here if you want kernel low-level debugging support | |
175 | on i.MX25. | |
176 | ||
177 | config DEBUG_IMX21_IMX27_UART | |
178 | bool "i.MX21 and i.MX27 Debug UART" | |
179 | depends on SOC_IMX21 || SOC_IMX27 | |
180 | help | |
181 | Say Y here if you want kernel low-level debugging support | |
182 | on i.MX21 or i.MX27. | |
183 | ||
184 | config DEBUG_IMX28_UART | |
185 | bool "i.MX28 Debug UART" | |
186 | depends on SOC_IMX28 | |
187 | help | |
188 | Say Y here if you want kernel low-level debugging support | |
189 | on i.MX28. | |
190 | ||
191 | config DEBUG_IMX31_IMX35_UART | |
192 | bool "i.MX31 and i.MX35 Debug UART" | |
193 | depends on SOC_IMX31 || SOC_IMX35 | |
194 | help | |
195 | Say Y here if you want kernel low-level debugging support | |
196 | on i.MX31 or i.MX35. | |
197 | ||
198 | config DEBUG_IMX51_UART | |
199 | bool "i.MX51 Debug UART" | |
200 | depends on SOC_IMX51 | |
201 | help | |
202 | Say Y here if you want kernel low-level debugging support | |
203 | on i.MX51. | |
204 | ||
205 | config DEBUG_IMX50_IMX53_UART | |
206 | bool "i.MX50 and i.MX53 Debug UART" | |
207 | depends on SOC_IMX50 || SOC_IMX53 | |
208 | help | |
209 | Say Y here if you want kernel low-level debugging support | |
210 | on i.MX50 or i.MX53. | |
211 | ||
785d7fab DB |
212 | config DEBUG_IMX6Q_UART2 |
213 | bool "i.MX6Q Debug UART2" | |
214 | depends on SOC_IMX6Q | |
215 | help | |
216 | Say Y here if you want kernel low-level debugging support | |
217 | on i.MX6Q UART2. This is correct for e.g. the SabreLite | |
218 | board. | |
219 | ||
cdaf29cf DB |
220 | config DEBUG_IMX6Q_UART4 |
221 | bool "i.MX6Q Debug UART4" | |
bac89d75 SG |
222 | depends on SOC_IMX6Q |
223 | help | |
224 | Say Y here if you want kernel low-level debugging support | |
cdaf29cf | 225 | on i.MX6Q UART4. |
bac89d75 | 226 | |
fa4cd2a8 HZ |
227 | config DEBUG_MMP_UART2 |
228 | bool "Kernel low-level debugging message via MMP UART2" | |
229 | depends on ARCH_MMP | |
230 | help | |
231 | Say Y here if you want kernel low-level debugging support | |
232 | on MMP UART2. | |
233 | ||
234 | config DEBUG_MMP_UART3 | |
235 | bool "Kernel low-level debugging message via MMP UART3" | |
236 | depends on ARCH_MMP | |
237 | help | |
238 | Say Y here if you want kernel low-level debugging support | |
239 | on MMP UART3. | |
240 | ||
e76f4750 RK |
241 | config DEBUG_MSM_UART1 |
242 | bool "Kernel low-level debugging messages via MSM UART1" | |
243 | depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50 | |
952aeeb2 WD |
244 | help |
245 | Say Y here if you want the debug print routines to direct | |
e76f4750 | 246 | their output to the first serial port on MSM devices. |
952aeeb2 | 247 | |
e76f4750 RK |
248 | config DEBUG_MSM_UART2 |
249 | bool "Kernel low-level debugging messages via MSM UART2" | |
250 | depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50 | |
952aeeb2 WD |
251 | help |
252 | Say Y here if you want the debug print routines to direct | |
e76f4750 | 253 | their output to the second serial port on MSM devices. |
952aeeb2 | 254 | |
e76f4750 RK |
255 | config DEBUG_MSM_UART3 |
256 | bool "Kernel low-level debugging messages via MSM UART3" | |
257 | depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50 | |
258 | help | |
259 | Say Y here if you want the debug print routines to direct | |
260 | their output to the third serial port on MSM devices. | |
952aeeb2 | 261 | |
e76f4750 RK |
262 | config DEBUG_MSM8660_UART |
263 | bool "Kernel low-level debugging messages via MSM 8660 UART" | |
264 | depends on ARCH_MSM8X60 | |
265 | select MSM_HAS_DEBUG_UART_HS | |
952aeeb2 WD |
266 | help |
267 | Say Y here if you want the debug print routines to direct | |
e76f4750 | 268 | their output to the serial port on MSM 8660 devices. |
952aeeb2 | 269 | |
e76f4750 RK |
270 | config DEBUG_MSM8960_UART |
271 | bool "Kernel low-level debugging messages via MSM 8960 UART" | |
272 | depends on ARCH_MSM8960 | |
273 | select MSM_HAS_DEBUG_UART_HS | |
274 | help | |
275 | Say Y here if you want the debug print routines to direct | |
276 | their output to the serial port on MSM 8960 devices. | |
952aeeb2 | 277 | |
bfd5af99 RH |
278 | config DEBUG_MVEBU_UART |
279 | bool "Kernel low-level debugging messages via MVEBU UART" | |
280 | depends on ARCH_MVEBU | |
281 | help | |
282 | Say Y here if you want kernel low-level debugging support | |
283 | on MVEBU based platforms. | |
284 | ||
59bba2a9 RH |
285 | config DEBUG_PICOXCELL_UART |
286 | depends on ARCH_PICOXCELL | |
287 | bool "Use PicoXcell UART for low-level debug" | |
288 | help | |
289 | Say Y here if you want kernel low-level debugging support | |
290 | on PicoXcell based platforms. | |
291 | ||
1285b8f8 WD |
292 | config DEBUG_REALVIEW_STD_PORT |
293 | bool "RealView Default UART" | |
294 | depends on ARCH_REALVIEW | |
295 | help | |
296 | Say Y here if you want the debug print routines to direct | |
297 | their output to the serial port on RealView EB, PB11MP, PBA8 | |
298 | and PBX platforms. | |
299 | ||
300 | config DEBUG_REALVIEW_PB1176_PORT | |
301 | bool "RealView PB1176 UART" | |
302 | depends on MACH_REALVIEW_PB1176 | |
303 | help | |
304 | Say Y here if you want the debug print routines to direct | |
305 | their output to the standard serial port on the RealView | |
306 | PB1176 platform. | |
307 | ||
e76f4750 RK |
308 | config DEBUG_S3C_UART0 |
309 | depends on PLAT_SAMSUNG | |
310 | bool "Use S3C UART 0 for low-level debug" | |
650e3f0d SB |
311 | help |
312 | Say Y here if you want the debug print routines to direct | |
e76f4750 RK |
313 | their output to UART 0. The port must have been initialised |
314 | by the boot-loader before use. | |
650e3f0d | 315 | |
e76f4750 RK |
316 | The uncompressor code port configuration is now handled |
317 | by CONFIG_S3C_LOWLEVEL_UART_PORT. | |
318 | ||
319 | config DEBUG_S3C_UART1 | |
320 | depends on PLAT_SAMSUNG | |
321 | bool "Use S3C UART 1 for low-level debug" | |
650e3f0d SB |
322 | help |
323 | Say Y here if you want the debug print routines to direct | |
e76f4750 RK |
324 | their output to UART 1. The port must have been initialised |
325 | by the boot-loader before use. | |
650e3f0d | 326 | |
e76f4750 RK |
327 | The uncompressor code port configuration is now handled |
328 | by CONFIG_S3C_LOWLEVEL_UART_PORT. | |
329 | ||
330 | config DEBUG_S3C_UART2 | |
331 | depends on PLAT_SAMSUNG | |
332 | bool "Use S3C UART 2 for low-level debug" | |
650e3f0d SB |
333 | help |
334 | Say Y here if you want the debug print routines to direct | |
e76f4750 RK |
335 | their output to UART 2. The port must have been initialised |
336 | by the boot-loader before use. | |
650e3f0d | 337 | |
e76f4750 RK |
338 | The uncompressor code port configuration is now handled |
339 | by CONFIG_S3C_LOWLEVEL_UART_PORT. | |
340 | ||
6111bf7c RH |
341 | config DEBUG_SOCFPGA_UART |
342 | depends on ARCH_SOCFPGA | |
343 | bool "Use SOCFPGA UART for low-level debug" | |
344 | help | |
345 | Say Y here if you want kernel low-level debugging support | |
346 | on SOCFPGA based platforms. | |
347 | ||
1b820eaf PM |
348 | config DEBUG_VEXPRESS_UART0_DETECT |
349 | bool "Autodetect UART0 on Versatile Express Cortex-A core tiles" | |
350 | depends on ARCH_VEXPRESS && CPU_CP15_MMU | |
351 | help | |
352 | This option enables a simple heuristic which tries to determine | |
353 | the motherboard's memory map variant (original or RS1) and then | |
354 | choose the relevant UART0 base address. | |
355 | ||
356 | Note that this will only work with standard A-class core tiles, | |
357 | and may fail with non-standard SMM or custom software models. | |
358 | ||
359 | config DEBUG_VEXPRESS_UART0_CA9 | |
360 | bool "Use PL011 UART0 at 0x10009000 (V2P-CA9 core tile)" | |
361 | depends on ARCH_VEXPRESS | |
362 | help | |
363 | This option selects UART0 at 0x10009000. Except for custom models, | |
364 | this applies only to the V2P-CA9 tile. | |
365 | ||
366 | config DEBUG_VEXPRESS_UART0_RS1 | |
367 | bool "Use PL011 UART0 at 0x1c090000 (RS1 complaint tiles)" | |
368 | depends on ARCH_VEXPRESS | |
369 | help | |
370 | This option selects UART0 at 0x1c090000. This applies to most | |
371 | of the tiles using the RS1 memory map, including all new A-class | |
372 | core tiles, FPGA-based SMMs and software models. | |
373 | ||
e76f4750 RK |
374 | config DEBUG_LL_UART_NONE |
375 | bool "No low-level debugging UART" | |
387798b3 | 376 | depends on !ARCH_MULTIPLATFORM |
a3d3ef9d | 377 | help |
e76f4750 RK |
378 | Say Y here if your platform doesn't provide a UART option |
379 | below. This relies on your platform choosing the right UART | |
380 | definition internally in order for low-level debugging to | |
381 | work. | |
a3d3ef9d | 382 | |
e76f4750 RK |
383 | config DEBUG_ICEDCC |
384 | bool "Kernel low-level debugging via EmbeddedICE DCC channel" | |
a3d3ef9d SB |
385 | help |
386 | Say Y here if you want the debug print routines to direct | |
e76f4750 RK |
387 | their output to the EmbeddedICE macrocell's DCC channel using |
388 | co-processor 14. This is known to work on the ARM9 style ICE | |
389 | channel and on the XScale with the PEEDI. | |
390 | ||
391 | Note that the system will appear to hang during boot if there | |
392 | is nothing connected to read from the DCC. | |
a3d3ef9d | 393 | |
b0df8986 | 394 | config DEBUG_SEMIHOSTING |
62194bda | 395 | bool "Kernel low-level debug output via semihosting I/O" |
650e3f0d | 396 | help |
b0df8986 RK |
397 | Semihosting enables code running on an ARM target to use |
398 | the I/O facilities on a host debugger/emulator through a | |
62194bda | 399 | simple SVC call. The host debugger or emulator must have |
b0df8986 RK |
400 | semihosting enabled for the special svc call to be trapped |
401 | otherwise the kernel will crash. | |
650e3f0d | 402 | |
62194bda | 403 | This is known to work with OpenOCD, as well as |
b0df8986 RK |
404 | ARM's Fast Models, or any other controlling environment |
405 | that implements semihosting. | |
a3d3ef9d | 406 | |
b0df8986 RK |
407 | For more details about semihosting, please see |
408 | chapter 8 of DUI0203I_rvct_developer_guide.pdf from ARM Ltd. | |
a3d3ef9d | 409 | |
17916b28 WD |
410 | endchoice |
411 | ||
91a9fec0 RH |
412 | config DEBUG_LL_INCLUDE |
413 | string | |
414 | default "debug/icedcc.S" if DEBUG_ICEDCC | |
2e9bb084 | 415 | default "debug/highbank.S" if DEBUG_HIGHBANK_UART |
bfd5af99 | 416 | default "debug/mvebu.S" if DEBUG_MVEBU_UART |
59bba2a9 | 417 | default "debug/picoxcell.S" if DEBUG_PICOXCELL_UART |
6111bf7c | 418 | default "debug/socfpga.S" if DEBUG_SOCFPGA_UART |
fa04e4db RH |
419 | default "debug/vexpress.S" if DEBUG_VEXPRESS_UART0_DETECT || \ |
420 | DEBUG_VEXPRESS_UART0_CA9 || DEBUG_VEXPRESS_UART0_RS1 | |
91a9fec0 RH |
421 | default "mach/debug-macro.S" |
422 | ||
93fd03a8 CM |
423 | config EARLY_PRINTK |
424 | bool "Early printk" | |
425 | depends on DEBUG_LL | |
426 | help | |
427 | Say Y here if you want to have an early console using the | |
428 | kernel low-level debugging functions. Add earlyprintk to your | |
429 | kernel parameters to enable this console. | |
430 | ||
c5d6c770 AS |
431 | config OC_ETM |
432 | bool "On-chip ETM and ETB" | |
53eebb0d | 433 | depends on ARM_AMBA |
c5d6c770 AS |
434 | help |
435 | Enables the on-chip embedded trace macrocell and embedded trace | |
436 | buffer driver that will allow you to collect traces of the | |
437 | kernel code. | |
438 | ||
4189bc71 JM |
439 | config ARM_KPROBES_TEST |
440 | tristate "Kprobes test module" | |
441 | depends on KPROBES && MODULES | |
442 | help | |
443 | Perform tests of kprobes API and instruction set simulation. | |
444 | ||
575320d6 WD |
445 | config PID_IN_CONTEXTIDR |
446 | bool "Write the current PID to the CONTEXTIDR register" | |
447 | depends on CPU_COPY_V6 | |
448 | help | |
449 | Enabling this option causes the kernel to write the current PID to | |
450 | the PROCID field of the CONTEXTIDR register, at the expense of some | |
451 | additional instructions during context switch. Say Y here only if you | |
452 | are planning to use hardware trace tools with this kernel. | |
453 | ||
1da177e4 | 454 | endmenu |