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