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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 EARLY_PRINTK_8250
24 bool
25 depends on EARLY_PRINTK && USE_GENERIC_EARLY_PRINTK_8250
26 default y
27 help
28 "8250/16550 and compatible serial early printk driver"
29 If you say Y here, it will be possible to use a 8250/16550 serial
30 port as the boot console.
31
32config USE_GENERIC_EARLY_PRINTK_8250
33 bool
34
35config CMDLINE_BOOL
36 bool "Built-in kernel command line"
37 default n
38 help
39 For most systems, it is firmware or second stage bootloader that
40 by default specifies the kernel command line options. However,
41 it might be necessary or advantageous to either override the
42 default kernel command line or add a few extra options to it.
43 For such cases, this option allows you to hardcode your own
44 command line options directly into the kernel. For that, you
45 should choose 'Y' here, and fill in the extra boot arguments
46 in CONFIG_CMDLINE.
47
48 The built-in options will be concatenated to the default command
49 line if CMDLINE_OVERRIDE is set to 'N'. Otherwise, the default
50 command line will be ignored and replaced by the built-in string.
51
52 Most MIPS systems will normally expect 'N' here and rely upon
53 the command line from the firmware or the second-stage bootloader.
54
55config CMDLINE
56 string "Default kernel command string"
57 depends on CMDLINE_BOOL
58 default ""
59 help
60 On some platforms, there is currently no way for the boot loader to
61 pass arguments to the kernel. For these platforms, and for the cases
62 when you want to add some extra options to the command line or ignore
63 the default command line, you can supply some command-line options at
64 build time by entering them here. In other cases you can specify
65 kernel args so that you don't have to set them up in board prom
66 initialization routines.
67
68 For more information, see the CMDLINE_BOOL and CMDLINE_OVERRIDE
69 options.
70
71config CMDLINE_OVERRIDE
72 bool "Built-in command line overrides firmware arguments"
73 default n
74 depends on CMDLINE_BOOL
75 help
76 By setting this option to 'Y' you will have your kernel ignore
77 command line arguments from firmware or second stage bootloader.
78 Instead, the built-in command line will be used exclusively.
79
80 Normally, you will choose 'N' here.
81
82config SMTC_IDLE_HOOK_DEBUG
83 bool "Enable additional debug checks before going into CPU idle loop"
84 depends on DEBUG_KERNEL && MIPS_MT_SMTC
85 help
86 This option enables Enable additional debug checks before going into
87 CPU idle loop. For details on these checks, see
88 arch/mips/kernel/smtc.c. This debugging option result in significant
89 overhead so should be disabled in production kernels.
90
91config SB1XXX_CORELIS
92 bool "Corelis Debugger"
93 depends on SIBYTE_SB1xxx_SOC
94 select DEBUG_INFO
95 help
96 Select compile flags that produce code that can be processed by the
97 Corelis mksym utility and UDB Emulator.
98
99config RUNTIME_DEBUG
100 bool "Enable run-time debugging"
101 depends on DEBUG_KERNEL
102 help
103 If you say Y here, some debugging macros will do run-time checking.
104 If you say N here, those macros will mostly turn to no-ops. See
105 arch/mips/include/asm/debug.h for debugging macros.
106 If unsure, say N.
107
108config DEBUG_ZBOOT
109 bool "Enable compressed kernel support debugging"
110 depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT
111 default n
112 help
113 If you want to add compressed kernel support to a new board, and the
114 board supports uart16550 compatible serial port, please select
115 SYS_SUPPORTS_ZBOOT_UART16550 for your board and enable this option to
116 debug it.
117
118 If your board doesn't support uart16550 compatible serial port, you
119 can try to select SYS_SUPPORTS_ZBOOT and use the other methods to
120 debug it. for example, add a new serial port support just as
121 arch/mips/boot/compressed/uart-16550.c does.
122
123 After the compressed kernel support works, please disable this option
124 to reduce the kernel image size and speed up the booting procedure a
125 little.
126
127config SPINLOCK_TEST
128 bool "Enable spinlock timing tests in debugfs"
129 depends on DEBUG_FS
130 default n
131 help
132 Add several files to the debugfs to test spinlock speed.
133
134endmenu
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_KERNEL if !COMPILE_TEST
81 select DEBUG_INFO if !COMPILE_TEST
82 help
83 Select compile flags that produce code that can be processed by the
84 Corelis mksym utility and UDB Emulator.
85
86config DEBUG_ZBOOT
87 bool "Enable compressed kernel support debugging"
88 depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT
89 default n
90 help
91 If you want to add compressed kernel support to a new board, and the
92 board supports uart16550 compatible serial port, please select
93 SYS_SUPPORTS_ZBOOT_UART16550 for your board and enable this option to
94 debug it.
95
96 If your board doesn't support uart16550 compatible serial port, you
97 can try to select SYS_SUPPORTS_ZBOOT and use the other methods to
98 debug it. for example, add a new serial port support just as
99 arch/mips/boot/compressed/uart-16550.c does.
100
101 After the compressed kernel support works, please disable this option
102 to reduce the kernel image size and speed up the booting procedure a
103 little.
104
105config ZBOOT_INGENIC_UART
106 int "UART to use for compressed kernel debugging"
107 depends on DEBUG_ZBOOT && MACH_INGENIC_SOC
108 default 0
109 range 0 4
110 help
111 Specify the UART that should be used for compressed kernel debugging.
112
113config SPINLOCK_TEST
114 bool "Enable spinlock timing tests in debugfs"
115 depends on DEBUG_FS
116 default n
117 help
118 Add several files to the debugfs to test spinlock speed.
119
120config SCACHE_DEBUGFS
121 bool "L2 cache debugfs entries"
122 depends on DEBUG_FS
123 help
124 Enable this to allow parts of the L2 cache configuration, such as
125 whether or not prefetching is enabled, to be exposed to userland
126 via debugfs.
127
128 If unsure, say N.
129
130menuconfig MIPS_CPS_NS16550_BOOL
131 bool "CPS SMP NS16550 UART output"
132 depends on MIPS_CPS
133 help
134 Output debug information via an ns16550 compatible UART if exceptions
135 occur early in the boot process of a secondary core.
136
137if MIPS_CPS_NS16550_BOOL
138
139config MIPS_CPS_NS16550
140 def_bool MIPS_CPS_NS16550_BASE != 0
141
142config MIPS_CPS_NS16550_BASE
143 hex "UART Base Address"
144 default 0x1b0003f8 if MIPS_MALTA
145 default 0
146 help
147 The base address of the ns16550 compatible UART on which to output
148 debug information from the early stages of core startup.
149
150 This is only used if non-zero.
151
152config MIPS_CPS_NS16550_SHIFT
153 int "UART Register Shift"
154 default 0
155 help
156 The number of bits to shift ns16550 register indices by in order to
157 form their addresses. That is, log base 2 of the span between
158 adjacent ns16550 registers in the system.
159
160config MIPS_CPS_NS16550_WIDTH
161 int "UART Register Width"
162 default 1
163 help
164 ns16550 registers width. UART registers IO access methods will be
165 selected in accordance with this parameter. By setting it to 1, 2 or
166 4 UART registers will be accessed by means of lb/sb, lh/sh or lw/sw
167 instructions respectively. Any value not from that set activates
168 lb/sb instructions.
169
170endif # MIPS_CPS_NS16550_BOOL