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
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"
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.
45 bool "Verbose user fault messages"
47 When a user program crashes due to an exception, the kernel can
48 print a brief message explaining what the problem was. This is
49 sometimes helpful for debugging but serves no purpose on a
50 production system. Most people should say N here.
52 In addition, you need to pass user_debug=N on the kernel command
53 line to enable this feature. N consists of the sum of:
55 1 - undefined instruction events
57 4 - invalid data aborts
62 bool "Verbose kernel error messages"
63 depends on DEBUG_KERNEL
65 This option controls verbose debugging information which can be
66 printed when the kernel detects an internal error. This debugging
67 information is useful to kernel hackers when tracking down problems,
68 but mostly meaningless to other people. It's safe to say Y unless
69 you are concerned with the code size or don't want to see these
72 config DEBUG_STACK_USAGE
73 bool "Enable stack utilization instrumentation"
74 depends on DEBUG_KERNEL
76 Enables the display of the minimum amount of free stack which each
77 task has ever had available in the sysrq-T output.
79 # These options are only for real kernel hackers who want to get their hands dirty.
81 bool "Kernel low-level debugging functions"
82 depends on DEBUG_KERNEL
84 Say Y here to include definitions of printascii, printch, printhex
85 in the kernel. This is helpful if you are debugging code that
86 executes before the console is initialized.
92 Say Y here if you want to have an early console using the
93 kernel low-level debugging functions. Add earlyprintk to your
94 kernel parameters to enable this console.
97 bool "Kernel low-level debugging via EmbeddedICE DCC channel"
100 Say Y here if you want the debug print routines to direct their
101 output to the EmbeddedICE macrocell's DCC channel using
102 co-processor 14. This is known to work on the ARM9 style ICE
103 channel and on the XScale with the PEEDI.
105 It does include a timeout to ensure that the system does not
106 totally freeze when there is nothing connected to read.
109 bool "On-chip ETM and ETB"
112 Enables the on-chip embedded trace macrocell and embedded trace
113 buffer driver that will allow you to collect traces of the
116 config DEBUG_DC21285_PORT
117 bool "Kernel low-level debugging messages via footbridge serial port"
118 depends on DEBUG_LL && FOOTBRIDGE
120 Say Y here if you want the debug print routines to direct their
121 output to the serial port in the DC21285 (Footbridge). Saying N
122 will cause the debug messages to appear on the first 16550
125 config DEBUG_CLPS711X_UART2
126 bool "Kernel low-level debugging messages via UART2"
127 depends on DEBUG_LL && ARCH_CLPS711X
129 Say Y here if you want the debug print routines to direct their
130 output to the second serial port on these devices. Saying N will
131 cause the debug messages to appear on the first serial port.
133 config DEBUG_S3C_UART
134 depends on PLAT_SAMSUNG
135 int "S3C UART to use for low-level debug"
138 Choice for UART for kernel low-level using S3C UARTS,
139 should be between zero and two. The port must have been
140 initialised by the boot-loader before use.
142 The uncompressor code port configuration is now handled
143 by CONFIG_S3C_LOWLEVEL_UART_PORT.