Root/arch/arm/Kconfig.debug

1menu "Kernel hacking"
2
3source "lib/Kconfig.debug"
4
5# RMK wants arm kernels compiled with frame pointers or stack unwinding.
6# If you know what you are doing and are willing to live without stack
7# traces, you can get a slightly smaller kernel by setting this option to
8# n, but then RMK will have to kill you ;).
9config FRAME_POINTER
10    bool
11    depends on !THUMB2_KERNEL
12    default y if !ARM_UNWIND
13    help
14      If you say N here, the resulting kernel will be slightly smaller and
15      faster. However, if neither FRAME_POINTER nor ARM_UNWIND are enabled,
16      when a problem occurs with the kernel, the information that is
17      reported is severely limited.
18
19config ARM_UNWIND
20    bool "Enable stack unwinding support"
21    depends on AEABI && EXPERIMENTAL
22    default y
23    help
24      This option enables stack unwinding support in the kernel
25      using the information automatically generated by the
26      compiler. The resulting kernel image is slightly bigger but
27      the performance is not affected. Currently, this feature
28      only works with EABI compilers. If unsure say Y.
29
30config DEBUG_USER
31    bool "Verbose user fault messages"
32    help
33      When a user program crashes due to an exception, the kernel can
34      print a brief message explaining what the problem was. This is
35      sometimes helpful for debugging but serves no purpose on a
36      production system. Most people should say N here.
37
38      In addition, you need to pass user_debug=N on the kernel command
39      line to enable this feature. N consists of the sum of:
40
41          1 - undefined instruction events
42          2 - system calls
43          4 - invalid data aborts
44          8 - SIGSEGV faults
45         16 - SIGBUS faults
46
47config DEBUG_ERRORS
48    bool "Verbose kernel error messages"
49    depends on DEBUG_KERNEL
50    help
51      This option controls verbose debugging information which can be
52      printed when the kernel detects an internal error. This debugging
53      information is useful to kernel hackers when tracking down problems,
54      but mostly meaningless to other people. It's safe to say Y unless
55      you are concerned with the code size or don't want to see these
56      messages.
57
58config DEBUG_STACK_USAGE
59    bool "Enable stack utilization instrumentation"
60    depends on DEBUG_KERNEL
61    help
62      Enables the display of the minimum amount of free stack which each
63      task has ever had available in the sysrq-T output.
64
65# These options are only for real kernel hackers who want to get their hands dirty.
66config DEBUG_LL
67    bool "Kernel low-level debugging functions"
68    depends on DEBUG_KERNEL
69    help
70      Say Y here to include definitions of printascii, printch, printhex
71      in the kernel. This is helpful if you are debugging code that
72      executes before the console is initialized.
73
74config EARLY_PRINTK
75    bool "Early printk"
76    depends on DEBUG_LL
77    help
78      Say Y here if you want to have an early console using the
79      kernel low-level debugging functions. Add earlyprintk to your
80      kernel parameters to enable this console.
81
82config DEBUG_ICEDCC
83    bool "Kernel low-level debugging via EmbeddedICE DCC channel"
84    depends on DEBUG_LL
85    help
86      Say Y here if you want the debug print routines to direct their
87      output to the EmbeddedICE macrocell's DCC channel using
88      co-processor 14. This is known to work on the ARM9 style ICE
89      channel and on the XScale with the PEEDI.
90
91      It does include a timeout to ensure that the system does not
92      totally freeze when there is nothing connected to read.
93
94config OC_ETM
95    bool "On-chip ETM and ETB"
96    select ARM_AMBA
97    help
98      Enables the on-chip embedded trace macrocell and embedded trace
99      buffer driver that will allow you to collect traces of the
100      kernel code.
101
102config DEBUG_DC21285_PORT
103    bool "Kernel low-level debugging messages via footbridge serial port"
104    depends on DEBUG_LL && FOOTBRIDGE
105    help
106      Say Y here if you want the debug print routines to direct their
107      output to the serial port in the DC21285 (Footbridge). Saying N
108      will cause the debug messages to appear on the first 16550
109      serial port.
110
111config DEBUG_CLPS711X_UART2
112    bool "Kernel low-level debugging messages via UART2"
113    depends on DEBUG_LL && ARCH_CLPS711X
114    help
115      Say Y here if you want the debug print routines to direct their
116      output to the second serial port on these devices. Saying N will
117      cause the debug messages to appear on the first serial port.
118
119config DEBUG_S3C_UART
120    depends on PLAT_SAMSUNG
121    int "S3C UART to use for low-level debug"
122    default "0"
123    help
124      Choice for UART for kernel low-level using S3C UARTS,
125      should be between zero and two. The port must have been
126      initialised by the boot-loader before use.
127
128      The uncompressor code port configuration is now handled
129      by CONFIG_S3C_LOWLEVEL_UART_PORT.
130
131endmenu
132

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