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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 Marinas16c79652009-07-24 12:33:02 +010011 depends on !THUMB2_KERNEL
Catalin Marinasadf8b372009-02-12 13:56:34 +010012 default y if !ARM_UNWIND
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 help
14 If you say N here, the resulting kernel will be slightly smaller and
Catalin Marinasadf8b372009-02-12 13:56:34 +010015 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
19config 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
30config 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070047config 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
Sascha Hauerddf4e42c2007-07-24 18:37:01 +020058config 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
65# These options are only for real kernel hackers who want to get their hands dirty.
66config DEBUG_LL
67 bool "Kernel low-level debugging functions"
68 depends on DEBUG_KERNEL
69 help
Russell King35efb602005-09-09 15:57:17 +010070 Say Y here to include definitions of printascii, printch, printhex
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 in the kernel. This is helpful if you are debugging code that
72 executes before the console is initialized.
73
74config 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
Jean-Christop PLAGNIOL-VILLARDc633c3c2009-02-25 04:20:40 +010081 channel and on the XScale with the PEEDI.
Linus Torvalds1da177e2005-04-16 15:20:36 -070082
83 It does include a timeout to ensure that the system does not
84 totally freeze when there is nothing connected to read.
85
86config 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
95config 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
Ben Dooks3ec20522007-07-22 16:12:04 +0100103config DEBUG_S3C_UART
104 depends on PLAT_S3C
105 int "S3C UART to use for low-level debug"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 default "0"
107 help
Ben Dooks3ec20522007-07-22 16:12:04 +0100108 Choice for UART for kernel low-level using S3C UARTS,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 should be between zero and two. The port must have been
Egry Gaborc41045a2006-06-04 21:22:11 +0100110 initialised by the boot-loader before use.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111
112 The uncompressor code port configuration is now handled
Ben Dooksc7657842007-07-22 16:11:20 +0100113 by CONFIG_S3C_LOWLEVEL_UART_PORT.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
115endmenu