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 | ||
f73765fc WD |
84 | config DEBUG_LL_UART_NONE |
85 | bool "No low-level debugging UART" | |
86 | help | |
87 | Say Y here if your platform doesn't provide a UART option | |
88 | below. This relies on your platform choosing the right UART | |
89 | definition internally in order for low-level debugging to | |
90 | work. | |
91 | ||
6996f425 SB |
92 | config DEBUG_ICEDCC |
93 | bool "Kernel low-level debugging via EmbeddedICE DCC channel" | |
94 | help | |
95 | Say Y here if you want the debug print routines to direct | |
96 | their output to the EmbeddedICE macrocell's DCC channel using | |
97 | co-processor 14. This is known to work on the ARM9 style ICE | |
98 | channel and on the XScale with the PEEDI. | |
99 | ||
f73765fc WD |
100 | Note that the system will appear to hang during boot if there |
101 | is nothing connected to read from the DCC. | |
164acf96 SB |
102 | |
103 | config DEBUG_FOOTBRIDGE_COM1 | |
104 | bool "Kernel low-level debugging messages via footbridge 8250 at PCI COM1" | |
105 | depends on FOOTBRIDGE | |
106 | help | |
107 | Say Y here if you want the debug print routines to direct | |
108 | their output to the 8250 at PCI COM1. | |
109 | ||
17916b28 WD |
110 | config DEBUG_DC21285_PORT |
111 | bool "Kernel low-level debugging messages via footbridge serial port" | |
112 | depends on FOOTBRIDGE | |
113 | help | |
114 | Say Y here if you want the debug print routines to direct | |
115 | their output to the serial port in the DC21285 (Footbridge). | |
164acf96 SB |
116 | |
117 | config DEBUG_CLPS711X_UART1 | |
118 | bool "Kernel low-level debugging messages via UART1" | |
119 | depends on ARCH_CLPS711X | |
120 | help | |
121 | Say Y here if you want the debug print routines to direct | |
122 | their output to the first serial port on these devices. | |
17916b28 WD |
123 | |
124 | config DEBUG_CLPS711X_UART2 | |
125 | bool "Kernel low-level debugging messages via UART2" | |
126 | depends on ARCH_CLPS711X | |
127 | help | |
128 | Say Y here if you want the debug print routines to direct | |
129 | their output to the second serial port on these devices. | |
17916b28 | 130 | |
f350b861 SG |
131 | config DEBUG_IMX1_UART |
132 | bool "i.MX1 Debug UART" | |
133 | depends on SOC_IMX1 | |
134 | help | |
135 | Say Y here if you want kernel low-level debugging support | |
136 | on i.MX1. | |
137 | ||
138 | config DEBUG_IMX23_UART | |
139 | bool "i.MX23 Debug UART" | |
140 | depends on SOC_IMX23 | |
141 | help | |
142 | Say Y here if you want kernel low-level debugging support | |
143 | on i.MX23. | |
144 | ||
145 | config DEBUG_IMX25_UART | |
146 | bool "i.MX25 Debug UART" | |
147 | depends on SOC_IMX25 | |
148 | help | |
149 | Say Y here if you want kernel low-level debugging support | |
150 | on i.MX25. | |
151 | ||
152 | config DEBUG_IMX21_IMX27_UART | |
153 | bool "i.MX21 and i.MX27 Debug UART" | |
154 | depends on SOC_IMX21 || SOC_IMX27 | |
155 | help | |
156 | Say Y here if you want kernel low-level debugging support | |
157 | on i.MX21 or i.MX27. | |
158 | ||
159 | config DEBUG_IMX28_UART | |
160 | bool "i.MX28 Debug UART" | |
161 | depends on SOC_IMX28 | |
162 | help | |
163 | Say Y here if you want kernel low-level debugging support | |
164 | on i.MX28. | |
165 | ||
166 | config DEBUG_IMX31_IMX35_UART | |
167 | bool "i.MX31 and i.MX35 Debug UART" | |
168 | depends on SOC_IMX31 || SOC_IMX35 | |
169 | help | |
170 | Say Y here if you want kernel low-level debugging support | |
171 | on i.MX31 or i.MX35. | |
172 | ||
173 | config DEBUG_IMX51_UART | |
174 | bool "i.MX51 Debug UART" | |
175 | depends on SOC_IMX51 | |
176 | help | |
177 | Say Y here if you want kernel low-level debugging support | |
178 | on i.MX51. | |
179 | ||
180 | config DEBUG_IMX50_IMX53_UART | |
181 | bool "i.MX50 and i.MX53 Debug UART" | |
182 | depends on SOC_IMX50 || SOC_IMX53 | |
183 | help | |
184 | Say Y here if you want kernel low-level debugging support | |
185 | on i.MX50 or i.MX53. | |
186 | ||
952aeeb2 WD |
187 | config DEBUG_S3C_UART0 |
188 | depends on PLAT_SAMSUNG | |
189 | bool "Use S3C UART 0 for low-level debug" | |
190 | help | |
191 | Say Y here if you want the debug print routines to direct | |
192 | their output to UART 0. The port must have been initialised | |
193 | by the boot-loader before use. | |
194 | ||
195 | The uncompressor code port configuration is now handled | |
196 | by CONFIG_S3C_LOWLEVEL_UART_PORT. | |
197 | ||
198 | config DEBUG_S3C_UART1 | |
199 | depends on PLAT_SAMSUNG | |
200 | bool "Use S3C UART 1 for low-level debug" | |
201 | help | |
202 | Say Y here if you want the debug print routines to direct | |
203 | their output to UART 1. The port must have been initialised | |
204 | by the boot-loader before use. | |
205 | ||
206 | The uncompressor code port configuration is now handled | |
207 | by CONFIG_S3C_LOWLEVEL_UART_PORT. | |
208 | ||
209 | config DEBUG_S3C_UART2 | |
210 | depends on PLAT_SAMSUNG | |
211 | bool "Use S3C UART 2 for low-level debug" | |
212 | help | |
213 | Say Y here if you want the debug print routines to direct | |
214 | their output to UART 2. The port must have been initialised | |
215 | by the boot-loader before use. | |
216 | ||
217 | The uncompressor code port configuration is now handled | |
218 | by CONFIG_S3C_LOWLEVEL_UART_PORT. | |
219 | ||
1285b8f8 WD |
220 | config DEBUG_REALVIEW_STD_PORT |
221 | bool "RealView Default UART" | |
222 | depends on ARCH_REALVIEW | |
223 | help | |
224 | Say Y here if you want the debug print routines to direct | |
225 | their output to the serial port on RealView EB, PB11MP, PBA8 | |
226 | and PBX platforms. | |
227 | ||
228 | config DEBUG_REALVIEW_PB1176_PORT | |
229 | bool "RealView PB1176 UART" | |
230 | depends on MACH_REALVIEW_PB1176 | |
231 | help | |
232 | Say Y here if you want the debug print routines to direct | |
233 | their output to the standard serial port on the RealView | |
234 | PB1176 platform. | |
235 | ||
17916b28 WD |
236 | endchoice |
237 | ||
93fd03a8 CM |
238 | config EARLY_PRINTK |
239 | bool "Early printk" | |
240 | depends on DEBUG_LL | |
241 | help | |
242 | Say Y here if you want to have an early console using the | |
243 | kernel low-level debugging functions. Add earlyprintk to your | |
244 | kernel parameters to enable this console. | |
245 | ||
c5d6c770 AS |
246 | config OC_ETM |
247 | bool "On-chip ETM and ETB" | |
53eebb0d | 248 | depends on ARM_AMBA |
c5d6c770 AS |
249 | help |
250 | Enables the on-chip embedded trace macrocell and embedded trace | |
251 | buffer driver that will allow you to collect traces of the | |
252 | kernel code. | |
253 | ||
4189bc71 JM |
254 | config ARM_KPROBES_TEST |
255 | tristate "Kprobes test module" | |
256 | depends on KPROBES && MODULES | |
257 | help | |
258 | Perform tests of kprobes API and instruction set simulation. | |
259 | ||
1da177e4 | 260 | endmenu |