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1da177e4 LT |
1 | menu "Kernel hacking" |
2 | ||
3 | source "lib/Kconfig.debug" | |
4 | ||
5 | # RMK wants arm kernels compiled with frame pointers so hardwire this to y. | |
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 ;). | |
9 | config FRAME_POINTER | |
10 | bool | |
11 | default y | |
12 | help | |
13 | If you say N here, the resulting kernel will be slightly smaller and | |
14 | faster. However, when a problem occurs with the kernel, the | |
15 | information that is reported is severely limited. Most people | |
16 | should say Y here. | |
17 | ||
18 | config DEBUG_USER | |
19 | bool "Verbose user fault messages" | |
20 | help | |
21 | When a user program crashes due to an exception, the kernel can | |
22 | print a brief message explaining what the problem was. This is | |
23 | sometimes helpful for debugging but serves no purpose on a | |
24 | production system. Most people should say N here. | |
25 | ||
26 | In addition, you need to pass user_debug=N on the kernel command | |
27 | line to enable this feature. N consists of the sum of: | |
28 | ||
29 | 1 - undefined instruction events | |
30 | 2 - system calls | |
31 | 4 - invalid data aborts | |
32 | 8 - SIGSEGV faults | |
33 | 16 - SIGBUS faults | |
34 | ||
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35 | config DEBUG_ERRORS |
36 | bool "Verbose kernel error messages" | |
37 | depends on DEBUG_KERNEL | |
38 | help | |
39 | This option controls verbose debugging information which can be | |
40 | printed when the kernel detects an internal error. This debugging | |
41 | information is useful to kernel hackers when tracking down problems, | |
42 | but mostly meaningless to other people. It's safe to say Y unless | |
43 | you are concerned with the code size or don't want to see these | |
44 | messages. | |
45 | ||
ddf4e42c SH |
46 | config DEBUG_STACK_USAGE |
47 | bool "Enable stack utilization instrumentation" | |
48 | depends on DEBUG_KERNEL | |
49 | help | |
50 | Enables the display of the minimum amount of free stack which each | |
51 | task has ever had available in the sysrq-T output. | |
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52 | |
53 | # These options are only for real kernel hackers who want to get their hands dirty. | |
54 | config DEBUG_LL | |
55 | bool "Kernel low-level debugging functions" | |
56 | depends on DEBUG_KERNEL | |
57 | help | |
35efb606 | 58 | Say Y here to include definitions of printascii, printch, printhex |
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59 | in the kernel. This is helpful if you are debugging code that |
60 | executes before the console is initialized. | |
61 | ||
62 | config DEBUG_ICEDCC | |
63 | bool "Kernel low-level debugging via EmbeddedICE DCC channel" | |
64 | depends on DEBUG_LL | |
65 | help | |
66 | Say Y here if you want the debug print routines to direct their | |
67 | output to the EmbeddedICE macrocell's DCC channel using | |
68 | co-processor 14. This is known to work on the ARM9 style ICE | |
69 | channel. | |
70 | ||
71 | It does include a timeout to ensure that the system does not | |
72 | totally freeze when there is nothing connected to read. | |
73 | ||
74 | config DEBUG_DC21285_PORT | |
75 | bool "Kernel low-level debugging messages via footbridge serial port" | |
76 | depends on DEBUG_LL && FOOTBRIDGE | |
77 | help | |
78 | Say Y here if you want the debug print routines to direct their | |
79 | output to the serial port in the DC21285 (Footbridge). Saying N | |
80 | will cause the debug messages to appear on the first 16550 | |
81 | serial port. | |
82 | ||
83 | config DEBUG_CLPS711X_UART2 | |
84 | bool "Kernel low-level debugging messages via UART2" | |
85 | depends on DEBUG_LL && ARCH_CLPS711X | |
86 | help | |
87 | Say Y here if you want the debug print routines to direct their | |
88 | output to the second serial port on these devices. Saying N will | |
89 | cause the debug messages to appear on the first serial port. | |
90 | ||
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91 | config DEBUG_S3C_PORT |
92 | depends on DEBUG_LL && PLAT_S3C | |
93 | bool "Kernel low-level debugging messages via S3C UART" | |
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94 | help |
95 | Say Y here if you want debug print routines to go to one of the | |
3ec20520 | 96 | S3C internal UARTs. The chosen UART must have been configured |
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97 | before it is used. |
98 | ||
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99 | config DEBUG_S3C_UART |
100 | depends on PLAT_S3C | |
101 | int "S3C UART to use for low-level debug" | |
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102 | default "0" |
103 | help | |
3ec20520 | 104 | Choice for UART for kernel low-level using S3C UARTS, |
1da177e4 | 105 | should be between zero and two. The port must have been |
c41045a4 | 106 | initialised by the boot-loader before use. |
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107 | |
108 | The uncompressor code port configuration is now handled | |
c7657846 | 109 | by CONFIG_S3C_LOWLEVEL_UART_PORT. |
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110 | |
111 | endmenu |