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"
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.
76 prompt "Kernel low-level debugging port"
79 config DEBUG_DC21285_PORT
80 bool "Kernel low-level debugging messages via footbridge serial port"
83 Say Y here if you want the debug print routines to direct
84 their output to the serial port in the DC21285 (Footbridge).
85 Saying N will cause the debug messages to appear on the first
88 config DEBUG_CLPS711X_UART2
89 bool "Kernel low-level debugging messages via UART2"
90 depends on ARCH_CLPS711X
92 Say Y here if you want the debug print routines to direct
93 their output to the second serial port on these devices.
94 Saying N will cause the debug messages to appear on the first
103 Say Y here if you want to have an early console using the
104 kernel low-level debugging functions. Add earlyprintk to your
105 kernel parameters to enable this console.
108 bool "Kernel low-level debugging via EmbeddedICE DCC channel"
111 Say Y here if you want the debug print routines to direct their
112 output to the EmbeddedICE macrocell's DCC channel using
113 co-processor 14. This is known to work on the ARM9 style ICE
114 channel and on the XScale with the PEEDI.
116 It does include a timeout to ensure that the system does not
117 totally freeze when there is nothing connected to read.
120 bool "On-chip ETM and ETB"
123 Enables the on-chip embedded trace macrocell and embedded trace
124 buffer driver that will allow you to collect traces of the
127 config DEBUG_S3C_UART
128 depends on PLAT_SAMSUNG
129 int "S3C UART to use for low-level debug"
132 Choice for UART for kernel low-level using S3C UARTS,
133 should be between zero and two. The port must have been
134 initialised by the boot-loader before use.
136 The uncompressor code port configuration is now handled
137 by CONFIG_S3C_LOWLEVEL_UART_PORT.