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1da177e4 LT |
1 | menu "Kernel hacking" |
2 | ||
3 | source "lib/Kconfig.debug" | |
4 | ||
adf8b37b | 5 | # RMK wants arm kernels compiled with frame pointers or stack unwinding. |
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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 | |
16c79651 | 11 | depends on !THUMB2_KERNEL |
adf8b37b | 12 | default y if !ARM_UNWIND |
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13 | help |
14 | If you say N here, the resulting kernel will be slightly smaller and | |
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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 | ||
19 | config 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. | |
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29 | |
30 | config 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 | ||
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47 | config 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 | ||
ddf4e42c SH |
58 | config 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. | |
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64 | |
65 | # These options are only for real kernel hackers who want to get their hands dirty. | |
66 | config DEBUG_LL | |
67 | bool "Kernel low-level debugging functions" | |
68 | depends on DEBUG_KERNEL | |
69 | help | |
35efb606 | 70 | Say Y here to include definitions of printascii, printch, printhex |
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71 | in the kernel. This is helpful if you are debugging code that |
72 | executes before the console is initialized. | |
73 | ||
74 | config DEBUG_ICEDCC | |
75 | bool "Kernel low-level debugging via EmbeddedICE DCC channel" | |
76 | depends on DEBUG_LL | |
77 | help | |
78 | Say Y here if you want the debug print routines to direct their | |
79 | output to the EmbeddedICE macrocell's DCC channel using | |
80 | co-processor 14. This is known to work on the ARM9 style ICE | |
c633c3cf | 81 | channel and on the XScale with the PEEDI. |
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82 | |
83 | It does include a timeout to ensure that the system does not | |
84 | totally freeze when there is nothing connected to read. | |
85 | ||
86 | config DEBUG_DC21285_PORT | |
87 | bool "Kernel low-level debugging messages via footbridge serial port" | |
88 | depends on DEBUG_LL && FOOTBRIDGE | |
89 | help | |
90 | Say Y here if you want the debug print routines to direct their | |
91 | output to the serial port in the DC21285 (Footbridge). Saying N | |
92 | will cause the debug messages to appear on the first 16550 | |
93 | serial port. | |
94 | ||
95 | config DEBUG_CLPS711X_UART2 | |
96 | bool "Kernel low-level debugging messages via UART2" | |
97 | depends on DEBUG_LL && ARCH_CLPS711X | |
98 | help | |
99 | Say Y here if you want the debug print routines to direct their | |
100 | output to the second serial port on these devices. Saying N will | |
101 | cause the debug messages to appear on the first serial port. | |
102 | ||
3ec20520 BD |
103 | config DEBUG_S3C_UART |
104 | depends on PLAT_S3C | |
105 | int "S3C UART to use for low-level debug" | |
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106 | default "0" |
107 | help | |
3ec20520 | 108 | Choice for UART for kernel low-level using S3C UARTS, |
1da177e4 | 109 | should be between zero and two. The port must have been |
c41045a4 | 110 | initialised by the boot-loader before use. |
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111 | |
112 | The uncompressor code port configuration is now handled | |
c7657846 | 113 | by CONFIG_S3C_LOWLEVEL_UART_PORT. |
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114 | |
115 | endmenu |