Commit | Line | Data |
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1da177e4 LT |
1 | menu "Kernel hacking" |
2 | ||
3 | source "lib/Kconfig.debug" | |
4 | ||
087aaffc NP |
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 | ||
adf8b37b | 19 | # RMK wants arm kernels compiled with frame pointers or stack unwinding. |
1da177e4 LT |
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 | |
16c79651 | 25 | depends on !THUMB2_KERNEL |
0e341af8 | 26 | default y if !ARM_UNWIND || FUNCTION_GRAPH_TRACER |
1da177e4 LT |
27 | help |
28 | If you say N here, the resulting kernel will be slightly smaller and | |
adf8b37b CM |
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 | |
4a50bfe3 | 34 | bool "Enable stack unwinding support (EXPERIMENTAL)" |
adf8b37b CM |
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. | |
1da177e4 | 43 | |
09bfafac RV |
44 | config OLD_MCOUNT |
45 | bool | |
46 | depends on FUNCTION_TRACER && FRAME_POINTER | |
47 | default y | |
48 | ||
1da177e4 LT |
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 | ||
1da177e4 LT |
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 | ||
ddf4e42c SH |
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. | |
1da177e4 LT |
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 | |
35efb606 | 89 | Say Y here to include definitions of printascii, printch, printhex |
1da177e4 LT |
90 | in the kernel. This is helpful if you are debugging code that |
91 | executes before the console is initialized. | |
92 | ||
93fd03a8 CM |
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 | ||
1da177e4 LT |
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 | |
c633c3cf | 108 | channel and on the XScale with the PEEDI. |
1da177e4 LT |
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 | ||
c5d6c770 AS |
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 | ||
1da177e4 LT |
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 | ||
3ec20520 | 138 | config DEBUG_S3C_UART |
89f1fa08 | 139 | depends on PLAT_SAMSUNG |
3ec20520 | 140 | int "S3C UART to use for low-level debug" |
1da177e4 LT |
141 | default "0" |
142 | help | |
3ec20520 | 143 | Choice for UART for kernel low-level using S3C UARTS, |
1da177e4 | 144 | should be between zero and two. The port must have been |
c41045a4 | 145 | initialised by the boot-loader before use. |
1da177e4 LT |
146 | |
147 | The uncompressor code port configuration is now handled | |
c7657846 | 148 | by CONFIG_S3C_LOWLEVEL_UART_PORT. |
1da177e4 LT |
149 | |
150 | endmenu |