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1menu "Kernel hacking"
2
3config TRACE_IRQFLAGS_SUPPORT
4 bool
5 default y
6
7source "lib/Kconfig.debug"
8
9config EARLY_PRINTK
10 bool "Early printk" if EXPERT
11 depends on SYS_HAS_EARLY_PRINTK
12 default y
13 help
14 This option enables special console drivers which allow the kernel
15 to print messages very early in the bootup process.
16
17 This is useful for kernel debugging when your machine crashes very
18 early before the console code is initialized. For normal operation,
19 it is not recommended because it looks ugly on some machines and
20 doesn't cooperate with an X server. You should normally say N here,
21 unless you want to debug such a crash.
22
23config CMDLINE_BOOL
24 bool "Built-in kernel command line"
25 default n
26 help
27 For most systems, it is firmware or second stage bootloader that
28 by default specifies the kernel command line options. However,
29 it might be necessary or advantageous to either override the
30 default kernel command line or add a few extra options to it.
31 For such cases, this option allows you to hardcode your own
32 command line options directly into the kernel. For that, you
33 should choose 'Y' here, and fill in the extra boot arguments
34 in CONFIG_CMDLINE.
35
36 The built-in options will be concatenated to the default command
37 line if CMDLINE_OVERRIDE is set to 'N'. Otherwise, the default
38 command line will be ignored and replaced by the built-in string.
39
40 Most MIPS systems will normally expect 'N' here and rely upon
41 the command line from the firmware or the second-stage bootloader.
42
43config CMDLINE
44 string "Default kernel command string"
45 depends on CMDLINE_BOOL
46 default ""
47 help
48 On some platforms, there is currently no way for the boot loader to
49 pass arguments to the kernel. For these platforms, and for the cases
50 when you want to add some extra options to the command line or ignore
51 the default command line, you can supply some command-line options at
52 build time by entering them here. In other cases you can specify
53 kernel args so that you don't have to set them up in board prom
54 initialization routines.
55
56 For more information, see the CMDLINE_BOOL and CMDLINE_OVERRIDE
57 options.
58
59config CMDLINE_OVERRIDE
60 bool "Built-in command line overrides firmware arguments"
61 default n
62 depends on CMDLINE_BOOL
63 help
64 By setting this option to 'Y' you will have your kernel ignore
65 command line arguments from firmware or second stage bootloader.
66 Instead, the built-in command line will be used exclusively.
67
68 Normally, you will choose 'N' here.
69
70config DEBUG_STACKOVERFLOW
71 bool "Check for stack overflows"
72 depends on DEBUG_KERNEL
73 help
74 This option will cause messages to be printed if free stack space
75 drops below a certain limit(2GB on MIPS). The debugging option
76 provides another way to check stack overflow happened on kernel mode
77 stack usually caused by nested interruption.
78
79config SMTC_IDLE_HOOK_DEBUG
80 bool "Enable additional debug checks before going into CPU idle loop"
81 depends on DEBUG_KERNEL && MIPS_MT_SMTC
82 help
83 This option enables Enable additional debug checks before going into
84 CPU idle loop. For details on these checks, see
85 arch/mips/kernel/smtc.c. This debugging option result in significant
86 overhead so should be disabled in production kernels.
87
88config SB1XXX_CORELIS
89 bool "Corelis Debugger"
90 depends on SIBYTE_SB1xxx_SOC
91 select DEBUG_INFO
92 help
93 Select compile flags that produce code that can be processed by the
94 Corelis mksym utility and UDB Emulator.
95
96config RUNTIME_DEBUG
97 bool "Enable run-time debugging"
98 depends on DEBUG_KERNEL
99 help
100 If you say Y here, some debugging macros will do run-time checking.
101 If you say N here, those macros will mostly turn to no-ops. See
102 arch/mips/include/asm/debug.h for debugging macros.
103 If unsure, say N.
104
105config DEBUG_ZBOOT
106 bool "Enable compressed kernel support debugging"
107 depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT
108 default n
109 help
110 If you want to add compressed kernel support to a new board, and the
111 board supports uart16550 compatible serial port, please select
112 SYS_SUPPORTS_ZBOOT_UART16550 for your board and enable this option to
113 debug it.
114
115 If your board doesn't support uart16550 compatible serial port, you
116 can try to select SYS_SUPPORTS_ZBOOT and use the other methods to
117 debug it. for example, add a new serial port support just as
118 arch/mips/boot/compressed/uart-16550.c does.
119
120 After the compressed kernel support works, please disable this option
121 to reduce the kernel image size and speed up the booting procedure a
122 little.
123
124config SPINLOCK_TEST
125 bool "Enable spinlock timing tests in debugfs"
126 depends on DEBUG_FS
127 default n
128 help
129 Add several files to the debugfs to test spinlock speed.
130
131endmenu
1# SPDX-License-Identifier: GPL-2.0
2
3config TRACE_IRQFLAGS_SUPPORT
4 bool
5 default y
6
7config EARLY_PRINTK
8 bool "Early printk" if EXPERT
9 depends on SYS_HAS_EARLY_PRINTK
10 default y
11 help
12 This option enables special console drivers which allow the kernel
13 to print messages very early in the bootup process.
14
15 This is useful for kernel debugging when your machine crashes very
16 early before the console code is initialized. For normal operation,
17 it is not recommended because it looks ugly on some machines and
18 doesn't cooperate with an X server. You should normally say N here,
19 unless you want to debug such a crash.
20
21config EARLY_PRINTK_8250
22 bool
23 depends on EARLY_PRINTK && USE_GENERIC_EARLY_PRINTK_8250
24 default y
25 help
26 "8250/16550 and compatible serial early printk driver"
27 If you say Y here, it will be possible to use a 8250/16550 serial
28 port as the boot console.
29
30config USE_GENERIC_EARLY_PRINTK_8250
31 bool
32
33config CMDLINE_BOOL
34 bool "Built-in kernel command line"
35 help
36 For most systems, it is firmware or second stage bootloader that
37 by default specifies the kernel command line options. However,
38 it might be necessary or advantageous to either override the
39 default kernel command line or add a few extra options to it.
40 For such cases, this option allows you to hardcode your own
41 command line options directly into the kernel. For that, you
42 should choose 'Y' here, and fill in the extra boot arguments
43 in CONFIG_CMDLINE.
44
45 The built-in options will be concatenated to the default command
46 line if CMDLINE_OVERRIDE is set to 'N'. Otherwise, the default
47 command line will be ignored and replaced by the built-in string.
48
49 Most MIPS systems will normally expect 'N' here and rely upon
50 the command line from the firmware or the second-stage bootloader.
51
52config CMDLINE
53 string "Default kernel command string"
54 depends on CMDLINE_BOOL
55 help
56 On some platforms, there is currently no way for the boot loader to
57 pass arguments to the kernel. For these platforms, and for the cases
58 when you want to add some extra options to the command line or ignore
59 the default command line, you can supply some command-line options at
60 build time by entering them here. In other cases you can specify
61 kernel args so that you don't have to set them up in board prom
62 initialization routines.
63
64 For more information, see the CMDLINE_BOOL and CMDLINE_OVERRIDE
65 options.
66
67config CMDLINE_OVERRIDE
68 bool "Built-in command line overrides firmware arguments"
69 depends on CMDLINE_BOOL
70 help
71 By setting this option to 'Y' you will have your kernel ignore
72 command line arguments from firmware or second stage bootloader.
73 Instead, the built-in command line will be used exclusively.
74
75 Normally, you will choose 'N' here.
76
77config SB1XXX_CORELIS
78 bool "Corelis Debugger"
79 depends on SIBYTE_SB1xxx_SOC
80 select DEBUG_INFO if !COMPILE_TEST
81 help
82 Select compile flags that produce code that can be processed by the
83 Corelis mksym utility and UDB Emulator.
84
85config DEBUG_ZBOOT
86 bool "Enable compressed kernel support debugging"
87 depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT
88 default n
89 help
90 If you want to add compressed kernel support to a new board, and the
91 board supports uart16550 compatible serial port, please select
92 SYS_SUPPORTS_ZBOOT_UART16550 for your board and enable this option to
93 debug it.
94
95 If your board doesn't support uart16550 compatible serial port, you
96 can try to select SYS_SUPPORTS_ZBOOT and use the other methods to
97 debug it. for example, add a new serial port support just as
98 arch/mips/boot/compressed/uart-16550.c does.
99
100 After the compressed kernel support works, please disable this option
101 to reduce the kernel image size and speed up the booting procedure a
102 little.
103
104config SPINLOCK_TEST
105 bool "Enable spinlock timing tests in debugfs"
106 depends on DEBUG_FS
107 default n
108 help
109 Add several files to the debugfs to test spinlock speed.
110
111config SCACHE_DEBUGFS
112 bool "L2 cache debugfs entries"
113 depends on DEBUG_FS
114 help
115 Enable this to allow parts of the L2 cache configuration, such as
116 whether or not prefetching is enabled, to be exposed to userland
117 via debugfs.
118
119 If unsure, say N.
120
121menuconfig MIPS_CPS_NS16550_BOOL
122 bool "CPS SMP NS16550 UART output"
123 depends on MIPS_CPS
124 help
125 Output debug information via an ns16550 compatible UART if exceptions
126 occur early in the boot process of a secondary core.
127
128if MIPS_CPS_NS16550_BOOL
129
130config MIPS_CPS_NS16550
131 def_bool MIPS_CPS_NS16550_BASE != 0
132
133config MIPS_CPS_NS16550_BASE
134 hex "UART Base Address"
135 default 0x1b0003f8 if MIPS_MALTA
136 default 0
137 help
138 The base address of the ns16550 compatible UART on which to output
139 debug information from the early stages of core startup.
140
141 This is only used if non-zero.
142
143config MIPS_CPS_NS16550_SHIFT
144 int "UART Register Shift"
145 default 0
146 help
147 The number of bits to shift ns16550 register indices by in order to
148 form their addresses. That is, log base 2 of the span between
149 adjacent ns16550 registers in the system.
150
151config MIPS_CPS_NS16550_WIDTH
152 int "UART Register Width"
153 default 1
154 help
155 ns16550 registers width. UART registers IO access methods will be
156 selected in accordance with this parameter. By setting it to 1, 2 or
157 4 UART registers will be accessed by means of lb/sb, lh/sh or lw/sw
158 instructions respectively. Any value not from that set activates
159 lb/sb instructions.
160
161endif # MIPS_CPS_NS16550_BOOL