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 | |
e76f4750 RK |
106 | config DEBUG_DC21285_PORT |
107 | bool "Kernel low-level debugging messages via footbridge serial port" | |
108 | depends on FOOTBRIDGE | |
109 | help | |
110 | Say Y here if you want the debug print routines to direct | |
111 | their output to the serial port in the DC21285 (Footbridge). | |
112 | ||
113 | config DEBUG_FOOTBRIDGE_COM1 | |
114 | bool "Kernel low-level debugging messages via footbridge 8250 at PCI COM1" | |
115 | depends on FOOTBRIDGE | |
116 | help | |
117 | Say Y here if you want the debug print routines to direct | |
118 | their output to the 8250 at PCI COM1. | |
119 | ||
220e6cf7 RH |
120 | config DEBUG_HIGHBANK_UART |
121 | bool "Kernel low-level debugging messages via Highbank UART" | |
122 | depends on ARCH_HIGHBANK | |
123 | help | |
124 | Say Y here if you want the debug print routines to direct | |
125 | their output to the UART on Highbank based devices. | |
126 | ||
f350b861 SG |
127 | config DEBUG_IMX1_UART |
128 | bool "i.MX1 Debug UART" | |
129 | depends on SOC_IMX1 | |
130 | help | |
131 | Say Y here if you want kernel low-level debugging support | |
132 | on i.MX1. | |
133 | ||
134 | config DEBUG_IMX23_UART | |
135 | bool "i.MX23 Debug UART" | |
136 | depends on SOC_IMX23 | |
137 | help | |
138 | Say Y here if you want kernel low-level debugging support | |
139 | on i.MX23. | |
140 | ||
141 | config DEBUG_IMX25_UART | |
142 | bool "i.MX25 Debug UART" | |
143 | depends on SOC_IMX25 | |
144 | help | |
145 | Say Y here if you want kernel low-level debugging support | |
146 | on i.MX25. | |
147 | ||
148 | config DEBUG_IMX21_IMX27_UART | |
149 | bool "i.MX21 and i.MX27 Debug UART" | |
150 | depends on SOC_IMX21 || SOC_IMX27 | |
151 | help | |
152 | Say Y here if you want kernel low-level debugging support | |
153 | on i.MX21 or i.MX27. | |
154 | ||
155 | config DEBUG_IMX28_UART | |
156 | bool "i.MX28 Debug UART" | |
157 | depends on SOC_IMX28 | |
158 | help | |
159 | Say Y here if you want kernel low-level debugging support | |
160 | on i.MX28. | |
161 | ||
162 | config DEBUG_IMX31_IMX35_UART | |
163 | bool "i.MX31 and i.MX35 Debug UART" | |
164 | depends on SOC_IMX31 || SOC_IMX35 | |
165 | help | |
166 | Say Y here if you want kernel low-level debugging support | |
167 | on i.MX31 or i.MX35. | |
168 | ||
169 | config DEBUG_IMX51_UART | |
170 | bool "i.MX51 Debug UART" | |
171 | depends on SOC_IMX51 | |
172 | help | |
173 | Say Y here if you want kernel low-level debugging support | |
174 | on i.MX51. | |
175 | ||
176 | config DEBUG_IMX50_IMX53_UART | |
177 | bool "i.MX50 and i.MX53 Debug UART" | |
178 | depends on SOC_IMX50 || SOC_IMX53 | |
179 | help | |
180 | Say Y here if you want kernel low-level debugging support | |
181 | on i.MX50 or i.MX53. | |
182 | ||
cdaf29cf DB |
183 | config DEBUG_IMX6Q_UART4 |
184 | bool "i.MX6Q Debug UART4" | |
bac89d75 SG |
185 | depends on SOC_IMX6Q |
186 | help | |
187 | Say Y here if you want kernel low-level debugging support | |
cdaf29cf | 188 | on i.MX6Q UART4. |
bac89d75 | 189 | |
e76f4750 RK |
190 | config DEBUG_MSM_UART1 |
191 | bool "Kernel low-level debugging messages via MSM UART1" | |
192 | depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50 | |
952aeeb2 WD |
193 | help |
194 | Say Y here if you want the debug print routines to direct | |
e76f4750 | 195 | their output to the first serial port on MSM devices. |
952aeeb2 | 196 | |
e76f4750 RK |
197 | config DEBUG_MSM_UART2 |
198 | bool "Kernel low-level debugging messages via MSM UART2" | |
199 | depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50 | |
952aeeb2 WD |
200 | help |
201 | Say Y here if you want the debug print routines to direct | |
e76f4750 | 202 | their output to the second serial port on MSM devices. |
952aeeb2 | 203 | |
e76f4750 RK |
204 | config DEBUG_MSM_UART3 |
205 | bool "Kernel low-level debugging messages via MSM UART3" | |
206 | depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50 | |
207 | help | |
208 | Say Y here if you want the debug print routines to direct | |
209 | their output to the third serial port on MSM devices. | |
952aeeb2 | 210 | |
e76f4750 RK |
211 | config DEBUG_MSM8660_UART |
212 | bool "Kernel low-level debugging messages via MSM 8660 UART" | |
213 | depends on ARCH_MSM8X60 | |
214 | select MSM_HAS_DEBUG_UART_HS | |
952aeeb2 WD |
215 | help |
216 | Say Y here if you want the debug print routines to direct | |
e76f4750 | 217 | their output to the serial port on MSM 8660 devices. |
952aeeb2 | 218 | |
e76f4750 RK |
219 | config DEBUG_MSM8960_UART |
220 | bool "Kernel low-level debugging messages via MSM 8960 UART" | |
221 | depends on ARCH_MSM8960 | |
222 | select MSM_HAS_DEBUG_UART_HS | |
223 | help | |
224 | Say Y here if you want the debug print routines to direct | |
225 | their output to the serial port on MSM 8960 devices. | |
952aeeb2 | 226 | |
1285b8f8 WD |
227 | config DEBUG_REALVIEW_STD_PORT |
228 | bool "RealView Default UART" | |
229 | depends on ARCH_REALVIEW | |
230 | help | |
231 | Say Y here if you want the debug print routines to direct | |
232 | their output to the serial port on RealView EB, PB11MP, PBA8 | |
233 | and PBX platforms. | |
234 | ||
235 | config DEBUG_REALVIEW_PB1176_PORT | |
236 | bool "RealView PB1176 UART" | |
237 | depends on MACH_REALVIEW_PB1176 | |
238 | help | |
239 | Say Y here if you want the debug print routines to direct | |
240 | their output to the standard serial port on the RealView | |
241 | PB1176 platform. | |
242 | ||
e76f4750 RK |
243 | config DEBUG_S3C_UART0 |
244 | depends on PLAT_SAMSUNG | |
245 | bool "Use S3C UART 0 for low-level debug" | |
650e3f0d SB |
246 | help |
247 | Say Y here if you want the debug print routines to direct | |
e76f4750 RK |
248 | their output to UART 0. The port must have been initialised |
249 | by the boot-loader before use. | |
650e3f0d | 250 | |
e76f4750 RK |
251 | The uncompressor code port configuration is now handled |
252 | by CONFIG_S3C_LOWLEVEL_UART_PORT. | |
253 | ||
254 | config DEBUG_S3C_UART1 | |
255 | depends on PLAT_SAMSUNG | |
256 | bool "Use S3C UART 1 for low-level debug" | |
650e3f0d SB |
257 | help |
258 | Say Y here if you want the debug print routines to direct | |
e76f4750 RK |
259 | their output to UART 1. The port must have been initialised |
260 | by the boot-loader before use. | |
650e3f0d | 261 | |
e76f4750 RK |
262 | The uncompressor code port configuration is now handled |
263 | by CONFIG_S3C_LOWLEVEL_UART_PORT. | |
264 | ||
265 | config DEBUG_S3C_UART2 | |
266 | depends on PLAT_SAMSUNG | |
267 | bool "Use S3C UART 2 for low-level debug" | |
650e3f0d SB |
268 | help |
269 | Say Y here if you want the debug print routines to direct | |
e76f4750 RK |
270 | their output to UART 2. The port must have been initialised |
271 | by the boot-loader before use. | |
650e3f0d | 272 | |
e76f4750 RK |
273 | The uncompressor code port configuration is now handled |
274 | by CONFIG_S3C_LOWLEVEL_UART_PORT. | |
275 | ||
276 | config DEBUG_LL_UART_NONE | |
277 | bool "No low-level debugging UART" | |
a3d3ef9d | 278 | help |
e76f4750 RK |
279 | Say Y here if your platform doesn't provide a UART option |
280 | below. This relies on your platform choosing the right UART | |
281 | definition internally in order for low-level debugging to | |
282 | work. | |
a3d3ef9d | 283 | |
e76f4750 RK |
284 | config DEBUG_ICEDCC |
285 | bool "Kernel low-level debugging via EmbeddedICE DCC channel" | |
a3d3ef9d SB |
286 | help |
287 | Say Y here if you want the debug print routines to direct | |
e76f4750 RK |
288 | their output to the EmbeddedICE macrocell's DCC channel using |
289 | co-processor 14. This is known to work on the ARM9 style ICE | |
290 | channel and on the XScale with the PEEDI. | |
291 | ||
292 | Note that the system will appear to hang during boot if there | |
293 | is nothing connected to read from the DCC. | |
a3d3ef9d | 294 | |
b0df8986 RK |
295 | config DEBUG_SEMIHOSTING |
296 | bool "Kernel low-level debug output via semihosting I" | |
650e3f0d | 297 | help |
b0df8986 RK |
298 | Semihosting enables code running on an ARM target to use |
299 | the I/O facilities on a host debugger/emulator through a | |
300 | simple SVC calls. The host debugger or emulator must have | |
301 | semihosting enabled for the special svc call to be trapped | |
302 | otherwise the kernel will crash. | |
650e3f0d | 303 | |
b0df8986 RK |
304 | This is known to work with OpenOCD, as wellas |
305 | ARM's Fast Models, or any other controlling environment | |
306 | that implements semihosting. | |
a3d3ef9d | 307 | |
b0df8986 RK |
308 | For more details about semihosting, please see |
309 | chapter 8 of DUI0203I_rvct_developer_guide.pdf from ARM Ltd. | |
a3d3ef9d | 310 | |
17916b28 WD |
311 | endchoice |
312 | ||
93fd03a8 CM |
313 | config EARLY_PRINTK |
314 | bool "Early printk" | |
315 | depends on DEBUG_LL | |
316 | help | |
317 | Say Y here if you want to have an early console using the | |
318 | kernel low-level debugging functions. Add earlyprintk to your | |
319 | kernel parameters to enable this console. | |
320 | ||
c5d6c770 AS |
321 | config OC_ETM |
322 | bool "On-chip ETM and ETB" | |
53eebb0d | 323 | depends on ARM_AMBA |
c5d6c770 AS |
324 | help |
325 | Enables the on-chip embedded trace macrocell and embedded trace | |
326 | buffer driver that will allow you to collect traces of the | |
327 | kernel code. | |
328 | ||
4189bc71 JM |
329 | config ARM_KPROBES_TEST |
330 | tristate "Kprobes test module" | |
331 | depends on KPROBES && MODULES | |
332 | help | |
333 | Perform tests of kprobes API and instruction set simulation. | |
334 | ||
1da177e4 | 335 | endmenu |