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1# SPDX-License-Identifier: GPL-2.0
2
3config EARLY_PRINTK
4 bool "Early printk" if EXPERT
5 depends on SYS_HAS_EARLY_PRINTK
6 default y
7 help
8 This option enables special console drivers which allow the kernel
9 to print messages very early in the bootup process.
10
11 This is useful for kernel debugging when your machine crashes very
12 early before the console code is initialized. For normal operation,
13 it is not recommended because it looks ugly on some machines and
14 doesn't cooperate with an X server. You should normally say N here,
15 unless you want to debug such a crash.
16
17config EARLY_PRINTK_8250
18 bool
19 depends on EARLY_PRINTK && USE_GENERIC_EARLY_PRINTK_8250
20 default y
21 help
22 "8250/16550 and compatible serial early printk driver"
23 If you say Y here, it will be possible to use a 8250/16550 serial
24 port as the boot console.
25
26config USE_GENERIC_EARLY_PRINTK_8250
27 bool
28
29config CMDLINE_BOOL
30 bool "Built-in kernel command line"
31 help
32 For most systems, it is firmware or second stage bootloader that
33 by default specifies the kernel command line options. However,
34 it might be necessary or advantageous to either override the
35 default kernel command line or add a few extra options to it.
36 For such cases, this option allows you to hardcode your own
37 command line options directly into the kernel. For that, you
38 should choose 'Y' here, and fill in the extra boot arguments
39 in CONFIG_CMDLINE.
40
41 The built-in options will be concatenated to the default command
42 line if CMDLINE_OVERRIDE is set to 'N'. Otherwise, the default
43 command line will be ignored and replaced by the built-in string.
44
45 Most MIPS systems will normally expect 'N' here and rely upon
46 the command line from the firmware or the second-stage bootloader.
47
48config CMDLINE
49 string "Default kernel command string"
50 depends on CMDLINE_BOOL
51 help
52 On some platforms, there is currently no way for the boot loader to
53 pass arguments to the kernel. For these platforms, and for the cases
54 when you want to add some extra options to the command line or ignore
55 the default command line, you can supply some command-line options at
56 build time by entering them here. In other cases you can specify
57 kernel args so that you don't have to set them up in board prom
58 initialization routines.
59
60 For more information, see the CMDLINE_BOOL and CMDLINE_OVERRIDE
61 options.
62
63config CMDLINE_OVERRIDE
64 bool "Built-in command line overrides firmware arguments"
65 depends on CMDLINE_BOOL
66 help
67 By setting this option to 'Y' you will have your kernel ignore
68 command line arguments from firmware or second stage bootloader.
69 Instead, the built-in command line will be used exclusively.
70
71 Normally, you will choose 'N' here.
72
73config SB1XXX_CORELIS
74 bool "Corelis Debugger"
75 depends on SIBYTE_SB1xxx_SOC
76 select DEBUG_KERNEL if !COMPILE_TEST
77 select DEBUG_INFO if !COMPILE_TEST
78 help
79 Select compile flags that produce code that can be processed by the
80 Corelis mksym utility and UDB Emulator.
81
82config DEBUG_ZBOOT
83 bool "Enable compressed kernel support debugging"
84 depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT
85 default n
86 help
87 If you want to add compressed kernel support to a new board, and the
88 board supports uart16550 compatible serial port, please select
89 SYS_SUPPORTS_ZBOOT_UART16550 for your board and enable this option to
90 debug it.
91
92 If your board doesn't support uart16550 compatible serial port, you
93 can try to select SYS_SUPPORTS_ZBOOT and use the other methods to
94 debug it. for example, add a new serial port support just as
95 arch/mips/boot/compressed/uart-16550.c does.
96
97 After the compressed kernel support works, please disable this option
98 to reduce the kernel image size and speed up the booting procedure a
99 little.
100
101config ZBOOT_INGENIC_UART
102 int "UART to use for compressed kernel debugging"
103 depends on DEBUG_ZBOOT && MACH_INGENIC_SOC
104 default 0
105 range 0 4
106 help
107 Specify the UART that should be used for compressed kernel debugging.
108
109config SPINLOCK_TEST
110 bool "Enable spinlock timing tests in debugfs"
111 depends on DEBUG_FS
112 default n
113 help
114 Add several files to the debugfs to test spinlock speed.
115
116config SCACHE_DEBUGFS
117 bool "L2 cache debugfs entries"
118 depends on DEBUG_FS
119 help
120 Enable this to allow parts of the L2 cache configuration, such as
121 whether or not prefetching is enabled, to be exposed to userland
122 via debugfs.
123
124 If unsure, say N.
125
126menuconfig MIPS_CPS_NS16550_BOOL
127 bool "CPS SMP NS16550 UART output"
128 depends on MIPS_CPS
129 help
130 Output debug information via an ns16550 compatible UART if exceptions
131 occur early in the boot process of a secondary core.
132
133if MIPS_CPS_NS16550_BOOL
134
135config MIPS_CPS_NS16550
136 def_bool MIPS_CPS_NS16550_BASE != 0
137
138config MIPS_CPS_NS16550_BASE
139 hex "UART Base Address"
140 default 0x1b0003f8 if MIPS_MALTA
141 default 0
142 help
143 The base address of the ns16550 compatible UART on which to output
144 debug information from the early stages of core startup.
145
146 This is only used if non-zero.
147
148config MIPS_CPS_NS16550_SHIFT
149 int "UART Register Shift"
150 default 0
151 help
152 The number of bits to shift ns16550 register indices by in order to
153 form their addresses. That is, log base 2 of the span between
154 adjacent ns16550 registers in the system.
155
156config MIPS_CPS_NS16550_WIDTH
157 int "UART Register Width"
158 default 1
159 help
160 ns16550 registers width. UART registers IO access methods will be
161 selected in accordance with this parameter. By setting it to 1, 2 or
162 4 UART registers will be accessed by means of lb/sb, lh/sh or lw/sw
163 instructions respectively. Any value not from that set activates
164 lb/sb instructions.
165
166endif # MIPS_CPS_NS16550_BOOL
1# SPDX-License-Identifier: GPL-2.0
2
3config EARLY_PRINTK
4 bool "Early printk" if EXPERT
5 depends on SYS_HAS_EARLY_PRINTK
6 default y
7 help
8 This option enables special console drivers which allow the kernel
9 to print messages very early in the bootup process.
10
11 This is useful for kernel debugging when your machine crashes very
12 early before the console code is initialized. For normal operation,
13 it is not recommended because it looks ugly on some machines and
14 doesn't cooperate with an X server. You should normally say N here,
15 unless you want to debug such a crash.
16
17config EARLY_PRINTK_8250
18 bool
19 depends on EARLY_PRINTK && USE_GENERIC_EARLY_PRINTK_8250
20 default y
21 help
22 "8250/16550 and compatible serial early printk driver"
23 If you say Y here, it will be possible to use a 8250/16550 serial
24 port as the boot console.
25
26config USE_GENERIC_EARLY_PRINTK_8250
27 bool
28
29config CMDLINE_BOOL
30 bool "Built-in kernel command line"
31 help
32 For most systems, it is firmware or second stage bootloader that
33 by default specifies the kernel command line options. However,
34 it might be necessary or advantageous to either override the
35 default kernel command line or add a few extra options to it.
36 For such cases, this option allows you to hardcode your own
37 command line options directly into the kernel. For that, you
38 should choose 'Y' here, and fill in the extra boot arguments
39 in CONFIG_CMDLINE.
40
41 The built-in options will be concatenated to the default command
42 line if CMDLINE_OVERRIDE is set to 'N'. Otherwise, the default
43 command line will be ignored and replaced by the built-in string.
44
45 Most MIPS systems will normally expect 'N' here and rely upon
46 the command line from the firmware or the second-stage bootloader.
47
48config CMDLINE
49 string "Default kernel command string"
50 depends on CMDLINE_BOOL
51 help
52 On some platforms, there is currently no way for the boot loader to
53 pass arguments to the kernel. For these platforms, and for the cases
54 when you want to add some extra options to the command line or ignore
55 the default command line, you can supply some command-line options at
56 build time by entering them here. In other cases you can specify
57 kernel args so that you don't have to set them up in board prom
58 initialization routines.
59
60 For more information, see the CMDLINE_BOOL and CMDLINE_OVERRIDE
61 options.
62
63config CMDLINE_OVERRIDE
64 bool "Built-in command line overrides firmware arguments"
65 depends on CMDLINE_BOOL
66 help
67 By setting this option to 'Y' you will have your kernel ignore
68 command line arguments from firmware or second stage bootloader.
69 Instead, the built-in command line will be used exclusively.
70
71 Normally, you will choose 'N' here.
72
73config SB1XXX_CORELIS
74 bool "Corelis Debugger"
75 depends on SIBYTE_SB1xxx_SOC
76 select DEBUG_KERNEL if !COMPILE_TEST
77 select DEBUG_INFO if !COMPILE_TEST
78 help
79 Select compile flags that produce code that can be processed by the
80 Corelis mksym utility and UDB Emulator.
81
82config DEBUG_ZBOOT
83 bool "Enable compressed kernel support debugging"
84 depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT
85 default n
86 help
87 If you want to add compressed kernel support to a new board, and the
88 board supports uart16550 compatible serial port, please select
89 SYS_SUPPORTS_ZBOOT_UART16550 for your board and enable this option to
90 debug it.
91
92 If your board doesn't support uart16550 compatible serial port, you
93 can try to select SYS_SUPPORTS_ZBOOT and use the other methods to
94 debug it. for example, add a new serial port support just as
95 arch/mips/boot/compressed/uart-16550.c does.
96
97 After the compressed kernel support works, please disable this option
98 to reduce the kernel image size and speed up the booting procedure a
99 little.
100
101config ZBOOT_INGENIC_UART
102 int "UART to use for compressed kernel debugging"
103 depends on DEBUG_ZBOOT && MACH_INGENIC_SOC
104 default 0
105 range 0 4
106 help
107 Specify the UART that should be used for compressed kernel debugging.
108
109config SPINLOCK_TEST
110 bool "Enable spinlock timing tests in debugfs"
111 depends on DEBUG_FS
112 default n
113 help
114 Add several files to the debugfs to test spinlock speed.
115
116config SCACHE_DEBUGFS
117 bool "L2 cache debugfs entries"
118 depends on DEBUG_FS
119 help
120 Enable this to allow parts of the L2 cache configuration, such as
121 whether or not prefetching is enabled, to be exposed to userland
122 via debugfs.
123
124 If unsure, say N.
125
126menuconfig MIPS_CPS_NS16550_BOOL
127 bool "CPS SMP NS16550 UART output"
128 depends on MIPS_CPS
129 help
130 Output debug information via an ns16550 compatible UART if exceptions
131 occur early in the boot process of a secondary core.
132
133if MIPS_CPS_NS16550_BOOL
134
135config MIPS_CPS_NS16550
136 def_bool MIPS_CPS_NS16550_BASE != 0
137
138config MIPS_CPS_NS16550_BASE
139 hex "UART Base Address"
140 default 0x1b0003f8 if MIPS_MALTA
141 default 0
142 help
143 The base address of the ns16550 compatible UART on which to output
144 debug information from the early stages of core startup.
145
146 This is only used if non-zero.
147
148config MIPS_CPS_NS16550_SHIFT
149 int "UART Register Shift"
150 default 0
151 help
152 The number of bits to shift ns16550 register indices by in order to
153 form their addresses. That is, log base 2 of the span between
154 adjacent ns16550 registers in the system.
155
156config MIPS_CPS_NS16550_WIDTH
157 int "UART Register Width"
158 default 1
159 help
160 ns16550 registers width. UART registers IO access methods will be
161 selected in accordance with this parameter. By setting it to 1, 2 or
162 4 UART registers will be accessed by means of lb/sb, lh/sh or lw/sw
163 instructions respectively. Any value not from that set activates
164 lb/sb instructions.
165
166endif # MIPS_CPS_NS16550_BOOL