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 DEBUG_LL_UART_NONE
85 bool "No low-level debugging UART"
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
93 bool "Kernel low-level debugging via EmbeddedICE DCC channel"
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.
100 Note that the system will appear to hang during boot if there
101 is nothing connected to read from the DCC.
103 config AT91_DEBUG_LL_DBGU0
104 bool "Kernel low-level debugging on rm9200, 9260/9g20, 9261/9g10 and 9rl"
105 depends on HAVE_AT91_DBGU0
107 config AT91_DEBUG_LL_DBGU1
108 bool "Kernel low-level debugging on 9263, 9g45 and cap9"
109 depends on HAVE_AT91_DBGU1
111 config DEBUG_FOOTBRIDGE_COM1
112 bool "Kernel low-level debugging messages via footbridge 8250 at PCI COM1"
113 depends on FOOTBRIDGE
115 Say Y here if you want the debug print routines to direct
116 their output to the 8250 at PCI COM1.
118 config DEBUG_DC21285_PORT
119 bool "Kernel low-level debugging messages via footbridge serial port"
120 depends on FOOTBRIDGE
122 Say Y here if you want the debug print routines to direct
123 their output to the serial port in the DC21285 (Footbridge).
125 config DEBUG_CLPS711X_UART1
126 bool "Kernel low-level debugging messages via UART1"
127 depends on ARCH_CLPS711X
129 Say Y here if you want the debug print routines to direct
130 their output to the first serial port on these devices.
132 config DEBUG_CLPS711X_UART2
133 bool "Kernel low-level debugging messages via UART2"
134 depends on ARCH_CLPS711X
136 Say Y here if you want the debug print routines to direct
137 their output to the second serial port on these devices.
139 config DEBUG_HIGHBANK_UART
140 bool "Kernel low-level debugging messages via Highbank UART"
141 depends on ARCH_HIGHBANK
143 Say Y here if you want the debug print routines to direct
144 their output to the UART on Highbank based devices.
146 config DEBUG_IMX1_UART
147 bool "i.MX1 Debug UART"
150 Say Y here if you want kernel low-level debugging support
153 config DEBUG_IMX23_UART
154 bool "i.MX23 Debug UART"
157 Say Y here if you want kernel low-level debugging support
160 config DEBUG_IMX25_UART
161 bool "i.MX25 Debug UART"
164 Say Y here if you want kernel low-level debugging support
167 config DEBUG_IMX21_IMX27_UART
168 bool "i.MX21 and i.MX27 Debug UART"
169 depends on SOC_IMX21 || SOC_IMX27
171 Say Y here if you want kernel low-level debugging support
174 config DEBUG_IMX28_UART
175 bool "i.MX28 Debug UART"
178 Say Y here if you want kernel low-level debugging support
181 config DEBUG_IMX31_IMX35_UART
182 bool "i.MX31 and i.MX35 Debug UART"
183 depends on SOC_IMX31 || SOC_IMX35
185 Say Y here if you want kernel low-level debugging support
188 config DEBUG_IMX51_UART
189 bool "i.MX51 Debug UART"
192 Say Y here if you want kernel low-level debugging support
195 config DEBUG_IMX50_IMX53_UART
196 bool "i.MX50 and i.MX53 Debug UART"
197 depends on SOC_IMX50 || SOC_IMX53
199 Say Y here if you want kernel low-level debugging support
202 config DEBUG_IMX6Q_UART
203 bool "i.MX6Q Debug UART"
206 Say Y here if you want kernel low-level debugging support
209 config DEBUG_S3C_UART0
210 depends on PLAT_SAMSUNG
211 bool "Use S3C UART 0 for low-level debug"
213 Say Y here if you want the debug print routines to direct
214 their output to UART 0. The port must have been initialised
215 by the boot-loader before use.
217 The uncompressor code port configuration is now handled
218 by CONFIG_S3C_LOWLEVEL_UART_PORT.
220 config DEBUG_S3C_UART1
221 depends on PLAT_SAMSUNG
222 bool "Use S3C UART 1 for low-level debug"
224 Say Y here if you want the debug print routines to direct
225 their output to UART 1. The port must have been initialised
226 by the boot-loader before use.
228 The uncompressor code port configuration is now handled
229 by CONFIG_S3C_LOWLEVEL_UART_PORT.
231 config DEBUG_S3C_UART2
232 depends on PLAT_SAMSUNG
233 bool "Use S3C UART 2 for low-level debug"
235 Say Y here if you want the debug print routines to direct
236 their output to UART 2. The port must have been initialised
237 by the boot-loader before use.
239 The uncompressor code port configuration is now handled
240 by CONFIG_S3C_LOWLEVEL_UART_PORT.
242 config DEBUG_REALVIEW_STD_PORT
243 bool "RealView Default UART"
244 depends on ARCH_REALVIEW
246 Say Y here if you want the debug print routines to direct
247 their output to the serial port on RealView EB, PB11MP, PBA8
250 config DEBUG_REALVIEW_PB1176_PORT
251 bool "RealView PB1176 UART"
252 depends on MACH_REALVIEW_PB1176
254 Say Y here if you want the debug print routines to direct
255 their output to the standard serial port on the RealView
258 config DEBUG_MSM_UART1
259 bool "Kernel low-level debugging messages via MSM UART1"
260 depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50
262 Say Y here if you want the debug print routines to direct
263 their output to the first serial port on MSM devices.
265 config DEBUG_MSM_UART2
266 bool "Kernel low-level debugging messages via MSM UART2"
267 depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50
269 Say Y here if you want the debug print routines to direct
270 their output to the second serial port on MSM devices.
272 config DEBUG_MSM_UART3
273 bool "Kernel low-level debugging messages via MSM UART3"
274 depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50
276 Say Y here if you want the debug print routines to direct
277 their output to the third serial port on MSM devices.
279 config DEBUG_MSM8660_UART
280 bool "Kernel low-level debugging messages via MSM 8660 UART"
281 depends on ARCH_MSM8X60
282 select MSM_HAS_DEBUG_UART_HS
284 Say Y here if you want the debug print routines to direct
285 their output to the serial port on MSM 8660 devices.
287 config DEBUG_MSM8960_UART
288 bool "Kernel low-level debugging messages via MSM 8960 UART"
289 depends on ARCH_MSM8960
290 select MSM_HAS_DEBUG_UART_HS
292 Say Y here if you want the debug print routines to direct
293 their output to the serial port on MSM 8960 devices.
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.