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Linus Torvalds1da177e2005-04-16 15:20:36 -07001menu "Kernel hacking"
2
3source "lib/Kconfig.debug"
4
Catalin Marinasadf8b372009-02-12 13:56:34 +01005# RMK wants arm kernels compiled with frame pointers or stack unwinding.
Linus Torvalds1da177e2005-04-16 15:20:36 -07006# 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
Catalin Marinasadf8b372009-02-12 13:56:34 +010011 default y if !ARM_UNWIND
Linus Torvalds1da177e2005-04-16 15:20:36 -070012 help
13 If you say N here, the resulting kernel will be slightly smaller and
Catalin Marinasadf8b372009-02-12 13:56:34 +010014 faster. However, if neither FRAME_POINTER nor ARM_UNWIND are enabled,
15 when a problem occurs with the kernel, the information that is
16 reported is severely limited.
17
18config ARM_UNWIND
19 bool "Enable stack unwinding support"
20 depends on AEABI && EXPERIMENTAL
21 default y
22 help
23 This option enables stack unwinding support in the kernel
24 using the information automatically generated by the
25 compiler. The resulting kernel image is slightly bigger but
26 the performance is not affected. Currently, this feature
27 only works with EABI compilers. If unsure say Y.
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
29config DEBUG_USER
30 bool "Verbose user fault messages"
31 help
32 When a user program crashes due to an exception, the kernel can
33 print a brief message explaining what the problem was. This is
34 sometimes helpful for debugging but serves no purpose on a
35 production system. Most people should say N here.
36
37 In addition, you need to pass user_debug=N on the kernel command
38 line to enable this feature. N consists of the sum of:
39
40 1 - undefined instruction events
41 2 - system calls
42 4 - invalid data aborts
43 8 - SIGSEGV faults
44 16 - SIGBUS faults
45
Linus Torvalds1da177e2005-04-16 15:20:36 -070046config DEBUG_ERRORS
47 bool "Verbose kernel error messages"
48 depends on DEBUG_KERNEL
49 help
50 This option controls verbose debugging information which can be
51 printed when the kernel detects an internal error. This debugging
52 information is useful to kernel hackers when tracking down problems,
53 but mostly meaningless to other people. It's safe to say Y unless
54 you are concerned with the code size or don't want to see these
55 messages.
56
Sascha Hauerddf4e42c2007-07-24 18:37:01 +020057config DEBUG_STACK_USAGE
58 bool "Enable stack utilization instrumentation"
59 depends on DEBUG_KERNEL
60 help
61 Enables the display of the minimum amount of free stack which each
62 task has ever had available in the sysrq-T output.
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
64# These options are only for real kernel hackers who want to get their hands dirty.
65config DEBUG_LL
66 bool "Kernel low-level debugging functions"
67 depends on DEBUG_KERNEL
68 help
Russell King35efb602005-09-09 15:57:17 +010069 Say Y here to include definitions of printascii, printch, printhex
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 in the kernel. This is helpful if you are debugging code that
71 executes before the console is initialized.
72
73config DEBUG_ICEDCC
74 bool "Kernel low-level debugging via EmbeddedICE DCC channel"
75 depends on DEBUG_LL
76 help
77 Say Y here if you want the debug print routines to direct their
78 output to the EmbeddedICE macrocell's DCC channel using
79 co-processor 14. This is known to work on the ARM9 style ICE
Jean-Christop PLAGNIOL-VILLARDc633c3c2009-02-25 04:20:40 +010080 channel and on the XScale with the PEEDI.
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
82 It does include a timeout to ensure that the system does not
83 totally freeze when there is nothing connected to read.
84
85config DEBUG_DC21285_PORT
86 bool "Kernel low-level debugging messages via footbridge serial port"
87 depends on DEBUG_LL && FOOTBRIDGE
88 help
89 Say Y here if you want the debug print routines to direct their
90 output to the serial port in the DC21285 (Footbridge). Saying N
91 will cause the debug messages to appear on the first 16550
92 serial port.
93
94config DEBUG_CLPS711X_UART2
95 bool "Kernel low-level debugging messages via UART2"
96 depends on DEBUG_LL && ARCH_CLPS711X
97 help
98 Say Y here if you want the debug print routines to direct their
99 output to the second serial port on these devices. Saying N will
100 cause the debug messages to appear on the first serial port.
101
Ben Dooks3ec20522007-07-22 16:12:04 +0100102config DEBUG_S3C_UART
103 depends on PLAT_S3C
104 int "S3C UART to use for low-level debug"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 default "0"
106 help
Ben Dooks3ec20522007-07-22 16:12:04 +0100107 Choice for UART for kernel low-level using S3C UARTS,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 should be between zero and two. The port must have been
Egry Gaborc41045a2006-06-04 21:22:11 +0100109 initialised by the boot-loader before use.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110
111 The uncompressor code port configuration is now handled
Ben Dooksc7657842007-07-22 16:11:20 +0100112 by CONFIG_S3C_LOWLEVEL_UART_PORT.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113
114endmenu