Root/
1 | menu "Kernel hacking" |
2 | |
3 | source "lib/Kconfig.debug" |
4 | |
5 | config STRICT_DEVMEM |
6 | bool "Filter access to /dev/mem" |
7 | depends on MMU |
8 | ---help--- |
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. |
13 | |
14 | If this option is switched on, the /dev/mem file only allows |
15 | userspace access to memory mapped peripherals. |
16 | |
17 | If in doubt, say Y. |
18 | |
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 ;). |
23 | config FRAME_POINTER |
24 | bool |
25 | depends on !THUMB2_KERNEL |
26 | default y if !ARM_UNWIND |
27 | help |
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. |
32 | |
33 | config ARM_UNWIND |
34 | bool "Enable stack unwinding support" |
35 | depends on AEABI && EXPERIMENTAL |
36 | default y |
37 | help |
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. |
43 | |
44 | config OLD_MCOUNT |
45 | bool |
46 | depends on FUNCTION_TRACER && FRAME_POINTER |
47 | default y |
48 | |
49 | config DEBUG_USER |
50 | bool "Verbose user fault messages" |
51 | help |
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. |
56 | |
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: |
59 | |
60 | 1 - undefined instruction events |
61 | 2 - system calls |
62 | 4 - invalid data aborts |
63 | 8 - SIGSEGV faults |
64 | 16 - SIGBUS faults |
65 | |
66 | config DEBUG_ERRORS |
67 | bool "Verbose kernel error messages" |
68 | depends on DEBUG_KERNEL |
69 | help |
70 | This option controls verbose debugging information which can be |
71 | printed when the kernel detects an internal error. This debugging |
72 | information is useful to kernel hackers when tracking down problems, |
73 | but mostly meaningless to other people. It's safe to say Y unless |
74 | you are concerned with the code size or don't want to see these |
75 | messages. |
76 | |
77 | config DEBUG_STACK_USAGE |
78 | bool "Enable stack utilization instrumentation" |
79 | depends on DEBUG_KERNEL |
80 | help |
81 | Enables the display of the minimum amount of free stack which each |
82 | task has ever had available in the sysrq-T output. |
83 | |
84 | # These options are only for real kernel hackers who want to get their hands dirty. |
85 | config DEBUG_LL |
86 | bool "Kernel low-level debugging functions" |
87 | depends on DEBUG_KERNEL |
88 | help |
89 | Say Y here to include definitions of printascii, printch, printhex |
90 | in the kernel. This is helpful if you are debugging code that |
91 | executes before the console is initialized. |
92 | |
93 | config EARLY_PRINTK |
94 | bool "Early printk" |
95 | depends on DEBUG_LL |
96 | help |
97 | Say Y here if you want to have an early console using the |
98 | kernel low-level debugging functions. Add earlyprintk to your |
99 | kernel parameters to enable this console. |
100 | |
101 | config DEBUG_ICEDCC |
102 | bool "Kernel low-level debugging via EmbeddedICE DCC channel" |
103 | depends on DEBUG_LL |
104 | help |
105 | Say Y here if you want the debug print routines to direct their |
106 | output to the EmbeddedICE macrocell's DCC channel using |
107 | co-processor 14. This is known to work on the ARM9 style ICE |
108 | channel and on the XScale with the PEEDI. |
109 | |
110 | It does include a timeout to ensure that the system does not |
111 | totally freeze when there is nothing connected to read. |
112 | |
113 | config OC_ETM |
114 | bool "On-chip ETM and ETB" |
115 | select ARM_AMBA |
116 | help |
117 | Enables the on-chip embedded trace macrocell and embedded trace |
118 | buffer driver that will allow you to collect traces of the |
119 | kernel code. |
120 | |
121 | config DEBUG_DC21285_PORT |
122 | bool "Kernel low-level debugging messages via footbridge serial port" |
123 | depends on DEBUG_LL && FOOTBRIDGE |
124 | help |
125 | Say Y here if you want the debug print routines to direct their |
126 | output to the serial port in the DC21285 (Footbridge). Saying N |
127 | will cause the debug messages to appear on the first 16550 |
128 | serial port. |
129 | |
130 | config DEBUG_CLPS711X_UART2 |
131 | bool "Kernel low-level debugging messages via UART2" |
132 | depends on DEBUG_LL && ARCH_CLPS711X |
133 | help |
134 | Say Y here if you want the debug print routines to direct their |
135 | output to the second serial port on these devices. Saying N will |
136 | cause the debug messages to appear on the first serial port. |
137 | |
138 | config DEBUG_S3C_UART |
139 | depends on PLAT_SAMSUNG |
140 | int "S3C UART to use for low-level debug" |
141 | default "0" |
142 | help |
143 | Choice for UART for kernel low-level using S3C UARTS, |
144 | should be between zero and two. The port must have been |
145 | initialised by the boot-loader before use. |
146 | |
147 | The uncompressor code port configuration is now handled |
148 | by CONFIG_S3C_LOWLEVEL_UART_PORT. |
149 | |
150 | endmenu |
151 |
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