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.
137 Say Y here if you want to have an early console using the
138 kernel low-level debugging functions. Add earlyprintk to your
139 kernel parameters to enable this console.
142 bool "On-chip ETM and ETB"
145 Enables the on-chip embedded trace macrocell and embedded trace
146 buffer driver that will allow you to collect traces of the
149 config DEBUG_S3C_UART
150 depends on PLAT_SAMSUNG
151 int "S3C UART to use for low-level debug"
154 Choice for UART for kernel low-level using S3C UARTS,
155 should be between zero and two. The port must have been
156 initialised by the boot-loader before use.
158 The uncompressor code port configuration is now handled
159 by CONFIG_S3C_LOWLEVEL_UART_PORT.