blob: 40c5eb1f55c7e3572f02ebdc39e12d9020bc1936 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001menu "Kernel hacking"
2
3source "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 ;).
9config 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
18config 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070035config 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
46
47# These options are only for real kernel hackers who want to get their hands dirty.
48config DEBUG_LL
49 bool "Kernel low-level debugging functions"
50 depends on DEBUG_KERNEL
51 help
Russell King35efb602005-09-09 15:57:17 +010052 Say Y here to include definitions of printascii, printch, printhex
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 in the kernel. This is helpful if you are debugging code that
54 executes before the console is initialized.
55
56config DEBUG_ICEDCC
57 bool "Kernel low-level debugging via EmbeddedICE DCC channel"
58 depends on DEBUG_LL
59 help
60 Say Y here if you want the debug print routines to direct their
61 output to the EmbeddedICE macrocell's DCC channel using
62 co-processor 14. This is known to work on the ARM9 style ICE
63 channel.
64
65 It does include a timeout to ensure that the system does not
66 totally freeze when there is nothing connected to read.
67
68config DEBUG_DC21285_PORT
69 bool "Kernel low-level debugging messages via footbridge serial port"
70 depends on DEBUG_LL && FOOTBRIDGE
71 help
72 Say Y here if you want the debug print routines to direct their
73 output to the serial port in the DC21285 (Footbridge). Saying N
74 will cause the debug messages to appear on the first 16550
75 serial port.
76
77config DEBUG_CLPS711X_UART2
78 bool "Kernel low-level debugging messages via UART2"
79 depends on DEBUG_LL && ARCH_CLPS711X
80 help
81 Say Y here if you want the debug print routines to direct their
82 output to the second serial port on these devices. Saying N will
83 cause the debug messages to appear on the first serial port.
84
85config DEBUG_S3C2410_PORT
86 depends on DEBUG_LL && ARCH_S3C2410
87 bool "Kernel low-level debugging messages via S3C2410 UART"
88 help
89 Say Y here if you want debug print routines to go to one of the
90 S3C2410 internal UARTs. The chosen UART must have been configured
91 before it is used.
92
93config DEBUG_S3C2410_UART
94 depends on ARCH_S3C2410
95 int "S3C2410 UART to use for low-level debug"
96 default "0"
97 help
98 Choice for UART for kernel low-level using S3C2410 UARTS,
99 should be between zero and two. The port must have been
Egry Gaborc41045a2006-06-04 21:22:11 +0100100 initialised by the boot-loader before use.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101
102 The uncompressor code port configuration is now handled
103 by CONFIG_S3C2410_LOWLEVEL_UART_PORT.
104
105endmenu