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 DEBUG_FOOTBRIDGE_COM1
104 bool "Kernel low-level debugging messages via footbridge 8250 at PCI COM1"
105 depends on FOOTBRIDGE
107 Say Y here if you want the debug print routines to direct
108 their output to the 8250 at PCI COM1.
110 config DEBUG_DC21285_PORT
111 bool "Kernel low-level debugging messages via footbridge serial port"
112 depends on FOOTBRIDGE
114 Say Y here if you want the debug print routines to direct
115 their output to the serial port in the DC21285 (Footbridge).
117 config DEBUG_CLPS711X_UART1
118 bool "Kernel low-level debugging messages via UART1"
119 depends on ARCH_CLPS711X
121 Say Y here if you want the debug print routines to direct
122 their output to the first serial port on these devices.
124 config DEBUG_CLPS711X_UART2
125 bool "Kernel low-level debugging messages via UART2"
126 depends on ARCH_CLPS711X
128 Say Y here if you want the debug print routines to direct
129 their output to the second serial port on these devices.
131 config DEBUG_IMX1_UART
132 bool "i.MX1 Debug UART"
135 Say Y here if you want kernel low-level debugging support
138 config DEBUG_IMX23_UART
139 bool "i.MX23 Debug UART"
142 Say Y here if you want kernel low-level debugging support
145 config DEBUG_IMX25_UART
146 bool "i.MX25 Debug UART"
149 Say Y here if you want kernel low-level debugging support
152 config DEBUG_IMX21_IMX27_UART
153 bool "i.MX21 and i.MX27 Debug UART"
154 depends on SOC_IMX21 || SOC_IMX27
156 Say Y here if you want kernel low-level debugging support
159 config DEBUG_IMX28_UART
160 bool "i.MX28 Debug UART"
163 Say Y here if you want kernel low-level debugging support
166 config DEBUG_IMX31_IMX35_UART
167 bool "i.MX31 and i.MX35 Debug UART"
168 depends on SOC_IMX31 || SOC_IMX35
170 Say Y here if you want kernel low-level debugging support
173 config DEBUG_IMX51_UART
174 bool "i.MX51 Debug UART"
177 Say Y here if you want kernel low-level debugging support
180 config DEBUG_IMX50_IMX53_UART
181 bool "i.MX50 and i.MX53 Debug UART"
182 depends on SOC_IMX50 || SOC_IMX53
184 Say Y here if you want kernel low-level debugging support
187 config DEBUG_IMX6Q_UART
188 bool "i.MX6Q Debug UART"
191 Say Y here if you want kernel low-level debugging support
194 config DEBUG_S3C_UART0
195 depends on PLAT_SAMSUNG
196 bool "Use S3C UART 0 for low-level debug"
198 Say Y here if you want the debug print routines to direct
199 their output to UART 0. The port must have been initialised
200 by the boot-loader before use.
202 The uncompressor code port configuration is now handled
203 by CONFIG_S3C_LOWLEVEL_UART_PORT.
205 config DEBUG_S3C_UART1
206 depends on PLAT_SAMSUNG
207 bool "Use S3C UART 1 for low-level debug"
209 Say Y here if you want the debug print routines to direct
210 their output to UART 1. The port must have been initialised
211 by the boot-loader before use.
213 The uncompressor code port configuration is now handled
214 by CONFIG_S3C_LOWLEVEL_UART_PORT.
216 config DEBUG_S3C_UART2
217 depends on PLAT_SAMSUNG
218 bool "Use S3C UART 2 for low-level debug"
220 Say Y here if you want the debug print routines to direct
221 their output to UART 2. The port must have been initialised
222 by the boot-loader before use.
224 The uncompressor code port configuration is now handled
225 by CONFIG_S3C_LOWLEVEL_UART_PORT.
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
249 Say Y here if you want to have an early console using the
250 kernel low-level debugging functions. Add earlyprintk to your
251 kernel parameters to enable this console.
254 bool "On-chip ETM and ETB"
257 Enables the on-chip embedded trace macrocell and embedded trace
258 buffer driver that will allow you to collect traces of the
261 config ARM_KPROBES_TEST
262 tristate "Kprobes test module"
263 depends on KPROBES && MODULES
265 Perform tests of kprobes API and instruction set simulation.