3 source "lib/Kconfig.debug"
6 bool "Filter access to /dev/mem"
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.
14 If this option is switched on, the /dev/mem file only allows
15 userspace access to memory mapped peripherals.
19 # RMK wants arm kernels compiled with frame pointers or stack unwinding.
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 ;).
25 depends on !THUMB2_KERNEL
26 default y if !ARM_UNWIND || FUNCTION_GRAPH_TRACER
28 If you say N here, the resulting kernel will be slightly smaller and
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.
34 bool "Enable stack unwinding support (EXPERIMENTAL)"
35 depends on AEABI && EXPERIMENTAL
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.
46 depends on FUNCTION_TRACER && FRAME_POINTER
50 bool "Verbose user fault messages"
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.
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:
60 1 - undefined instruction events
62 4 - invalid data aborts
66 # These options are only for real kernel hackers who want to get their hands dirty.
68 bool "Kernel low-level debugging functions (read help!)"
69 depends on DEBUG_KERNEL
71 Say Y here to include definitions of printascii, printch, printhex
72 in the kernel. This is helpful if you are debugging code that
73 executes before the console is initialized.
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.
81 prompt "Kernel low-level debugging port"
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
88 config AT91_DEBUG_LL_DBGU1
89 bool "Kernel low-level debugging on 9263, 9g45 and cap9"
90 depends on HAVE_AT91_DBGU1
92 config DEBUG_CLPS711X_UART1
93 bool "Kernel low-level debugging messages via UART1"
94 depends on ARCH_CLPS711X
96 Say Y here if you want the debug print routines to direct
97 their output to the first serial port on these devices.
99 config DEBUG_CLPS711X_UART2
100 bool "Kernel low-level debugging messages via UART2"
101 depends on ARCH_CLPS711X
103 Say Y here if you want the debug print routines to direct
104 their output to the second serial port on these devices.
106 config DEBUG_DC21285_PORT
107 bool "Kernel low-level debugging messages via footbridge serial port"
108 depends on FOOTBRIDGE
110 Say Y here if you want the debug print routines to direct
111 their output to the serial port in the DC21285 (Footbridge).
113 config DEBUG_FOOTBRIDGE_COM1
114 bool "Kernel low-level debugging messages via footbridge 8250 at PCI COM1"
115 depends on FOOTBRIDGE
117 Say Y here if you want the debug print routines to direct
118 their output to the 8250 at PCI COM1.
120 config DEBUG_HIGHBANK_UART
121 bool "Kernel low-level debugging messages via Highbank UART"
122 depends on ARCH_HIGHBANK
124 Say Y here if you want the debug print routines to direct
125 their output to the UART on Highbank based devices.
127 config DEBUG_IMX1_UART
128 bool "i.MX1 Debug UART"
131 Say Y here if you want kernel low-level debugging support
134 config DEBUG_IMX23_UART
135 bool "i.MX23 Debug UART"
138 Say Y here if you want kernel low-level debugging support
141 config DEBUG_IMX25_UART
142 bool "i.MX25 Debug UART"
145 Say Y here if you want kernel low-level debugging support
148 config DEBUG_IMX21_IMX27_UART
149 bool "i.MX21 and i.MX27 Debug UART"
150 depends on SOC_IMX21 || SOC_IMX27
152 Say Y here if you want kernel low-level debugging support
155 config DEBUG_IMX28_UART
156 bool "i.MX28 Debug UART"
159 Say Y here if you want kernel low-level debugging support
162 config DEBUG_IMX31_IMX35_UART
163 bool "i.MX31 and i.MX35 Debug UART"
164 depends on SOC_IMX31 || SOC_IMX35
166 Say Y here if you want kernel low-level debugging support
169 config DEBUG_IMX51_UART
170 bool "i.MX51 Debug UART"
173 Say Y here if you want kernel low-level debugging support
176 config DEBUG_IMX50_IMX53_UART
177 bool "i.MX50 and i.MX53 Debug UART"
178 depends on SOC_IMX50 || SOC_IMX53
180 Say Y here if you want kernel low-level debugging support
183 config DEBUG_IMX6Q_UART
184 bool "i.MX6Q Debug UART"
187 Say Y here if you want kernel low-level debugging support
190 config DEBUG_MSM_UART1
191 bool "Kernel low-level debugging messages via MSM UART1"
192 depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50
194 Say Y here if you want the debug print routines to direct
195 their output to the first serial port on MSM devices.
197 config DEBUG_MSM_UART2
198 bool "Kernel low-level debugging messages via MSM UART2"
199 depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50
201 Say Y here if you want the debug print routines to direct
202 their output to the second serial port on MSM devices.
204 config DEBUG_MSM_UART3
205 bool "Kernel low-level debugging messages via MSM UART3"
206 depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50
208 Say Y here if you want the debug print routines to direct
209 their output to the third serial port on MSM devices.
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
216 Say Y here if you want the debug print routines to direct
217 their output to the serial port on MSM 8660 devices.
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
224 Say Y here if you want the debug print routines to direct
225 their output to the serial port on MSM 8960 devices.
227 config DEBUG_REALVIEW_STD_PORT
228 bool "RealView Default UART"
229 depends on ARCH_REALVIEW
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
235 config DEBUG_REALVIEW_PB1176_PORT
236 bool "RealView PB1176 UART"
237 depends on MACH_REALVIEW_PB1176
239 Say Y here if you want the debug print routines to direct
240 their output to the standard serial port on the RealView
243 config DEBUG_S3C_UART0
244 depends on PLAT_SAMSUNG
245 bool "Use S3C UART 0 for low-level debug"
247 Say Y here if you want the debug print routines to direct
248 their output to UART 0. The port must have been initialised
249 by the boot-loader before use.
251 The uncompressor code port configuration is now handled
252 by CONFIG_S3C_LOWLEVEL_UART_PORT.
254 config DEBUG_S3C_UART1
255 depends on PLAT_SAMSUNG
256 bool "Use S3C UART 1 for low-level debug"
258 Say Y here if you want the debug print routines to direct
259 their output to UART 1. The port must have been initialised
260 by the boot-loader before use.
262 The uncompressor code port configuration is now handled
263 by CONFIG_S3C_LOWLEVEL_UART_PORT.
265 config DEBUG_S3C_UART2
266 depends on PLAT_SAMSUNG
267 bool "Use S3C UART 2 for low-level debug"
269 Say Y here if you want the debug print routines to direct
270 their output to UART 2. The port must have been initialised
271 by the boot-loader before use.
273 The uncompressor code port configuration is now handled
274 by CONFIG_S3C_LOWLEVEL_UART_PORT.
276 config DEBUG_LL_UART_NONE
277 bool "No low-level debugging UART"
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
285 bool "Kernel low-level debugging via EmbeddedICE DCC channel"
287 Say Y here if you want the debug print routines to direct
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.
292 Note that the system will appear to hang during boot if there
293 is nothing connected to read from the DCC.
301 Say Y here if you want to have an early console using the
302 kernel low-level debugging functions. Add earlyprintk to your
303 kernel parameters to enable this console.
306 bool "On-chip ETM and ETB"
309 Enables the on-chip embedded trace macrocell and embedded trace
310 buffer driver that will allow you to collect traces of the
313 config ARM_KPROBES_TEST
314 tristate "Kprobes test module"
315 depends on KPROBES && MODULES
317 Perform tests of kprobes API and instruction set simulation.