1 # SPDX-License-Identifier: GPL-2.0 1 # SPDX-License-Identifier: GPL-2.0
2 2
3 config EARLY_PRINTK 3 config EARLY_PRINTK
4 bool "Early printk" if EXPERT 4 bool "Early printk" if EXPERT
5 depends on SYS_HAS_EARLY_PRINTK 5 depends on SYS_HAS_EARLY_PRINTK
6 default y 6 default y
7 help 7 help
8 This option enables special console 8 This option enables special console drivers which allow the kernel
9 to print messages very early in the 9 to print messages very early in the bootup process.
10 10
11 This is useful for kernel debugging 11 This is useful for kernel debugging when your machine crashes very
12 early before the console code is ini 12 early before the console code is initialized. For normal operation,
13 it is not recommended because it loo 13 it is not recommended because it looks ugly on some machines and
14 doesn't cooperate with an X server. 14 doesn't cooperate with an X server. You should normally say N here,
15 unless you want to debug such a cras 15 unless you want to debug such a crash.
16 16
17 config EARLY_PRINTK_8250 17 config EARLY_PRINTK_8250
18 bool 18 bool
19 depends on EARLY_PRINTK && USE_GENERIC 19 depends on EARLY_PRINTK && USE_GENERIC_EARLY_PRINTK_8250
20 default y 20 default y
21 help 21 help
22 "8250/16550 and compatible serial ea 22 "8250/16550 and compatible serial early printk driver"
23 If you say Y here, it will be possib 23 If you say Y here, it will be possible to use a 8250/16550 serial
24 port as the boot console. 24 port as the boot console.
25 25
26 config USE_GENERIC_EARLY_PRINTK_8250 26 config USE_GENERIC_EARLY_PRINTK_8250
27 bool 27 bool
28 28
29 config CMDLINE_BOOL 29 config CMDLINE_BOOL
30 bool "Built-in kernel command line" 30 bool "Built-in kernel command line"
31 help 31 help
32 For most systems, it is firmware or 32 For most systems, it is firmware or second stage bootloader that
33 by default specifies the kernel comm 33 by default specifies the kernel command line options. However,
34 it might be necessary or advantageou 34 it might be necessary or advantageous to either override the
35 default kernel command line or add a 35 default kernel command line or add a few extra options to it.
36 For such cases, this option allows y 36 For such cases, this option allows you to hardcode your own
37 command line options directly into t 37 command line options directly into the kernel. For that, you
38 should choose 'Y' here, and fill in 38 should choose 'Y' here, and fill in the extra boot arguments
39 in CONFIG_CMDLINE. 39 in CONFIG_CMDLINE.
40 40
41 The built-in options will be concate 41 The built-in options will be concatenated to the default command
42 line if CMDLINE_OVERRIDE is set to ' 42 line if CMDLINE_OVERRIDE is set to 'N'. Otherwise, the default
43 command line will be ignored and rep 43 command line will be ignored and replaced by the built-in string.
44 44
45 Most MIPS systems will normally expe 45 Most MIPS systems will normally expect 'N' here and rely upon
46 the command line from the firmware o 46 the command line from the firmware or the second-stage bootloader.
47 47
48 config CMDLINE 48 config CMDLINE
49 string "Default kernel command string" 49 string "Default kernel command string"
50 depends on CMDLINE_BOOL 50 depends on CMDLINE_BOOL
51 help 51 help
52 On some platforms, there is currentl 52 On some platforms, there is currently no way for the boot loader to
53 pass arguments to the kernel. For t 53 pass arguments to the kernel. For these platforms, and for the cases
54 when you want to add some extra opti 54 when you want to add some extra options to the command line or ignore
55 the default command line, you can su 55 the default command line, you can supply some command-line options at
56 build time by entering them here. I 56 build time by entering them here. In other cases you can specify
57 kernel args so that you don't have t 57 kernel args so that you don't have to set them up in board prom
58 initialization routines. 58 initialization routines.
59 59
60 For more information, see the CMDLIN 60 For more information, see the CMDLINE_BOOL and CMDLINE_OVERRIDE
61 options. 61 options.
62 62
63 config CMDLINE_OVERRIDE 63 config CMDLINE_OVERRIDE
64 bool "Built-in command line overrides 64 bool "Built-in command line overrides firmware arguments"
65 depends on CMDLINE_BOOL 65 depends on CMDLINE_BOOL
66 help 66 help
67 By setting this option to 'Y' you wi 67 By setting this option to 'Y' you will have your kernel ignore
68 command line arguments from firmware 68 command line arguments from firmware or second stage bootloader.
69 Instead, the built-in command line w 69 Instead, the built-in command line will be used exclusively.
70 70
71 Normally, you will choose 'N' here. 71 Normally, you will choose 'N' here.
72 72
73 config SB1XXX_CORELIS 73 config SB1XXX_CORELIS
74 bool "Corelis Debugger" 74 bool "Corelis Debugger"
75 depends on SIBYTE_SB1xxx_SOC 75 depends on SIBYTE_SB1xxx_SOC
76 select DEBUG_KERNEL if !COMPILE_TEST 76 select DEBUG_KERNEL if !COMPILE_TEST
77 select DEBUG_INFO if !COMPILE_TEST 77 select DEBUG_INFO if !COMPILE_TEST
78 help 78 help
79 Select compile flags that produce co 79 Select compile flags that produce code that can be processed by the
80 Corelis mksym utility and UDB Emulat 80 Corelis mksym utility and UDB Emulator.
81 81
82 config DEBUG_ZBOOT 82 config DEBUG_ZBOOT
83 bool "Enable compressed kernel support 83 bool "Enable compressed kernel support debugging"
84 depends on DEBUG_KERNEL && SYS_SUPPORT 84 depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT
85 default n 85 default n
86 help 86 help
87 If you want to add compressed kernel 87 If you want to add compressed kernel support to a new board, and the
88 board supports uart16550 compatible 88 board supports uart16550 compatible serial port, please select
89 SYS_SUPPORTS_ZBOOT_UART16550 for you 89 SYS_SUPPORTS_ZBOOT_UART16550 for your board and enable this option to
90 debug it. 90 debug it.
91 91
92 If your board doesn't support uart16 92 If your board doesn't support uart16550 compatible serial port, you
93 can try to select SYS_SUPPORTS_ZBOOT 93 can try to select SYS_SUPPORTS_ZBOOT and use the other methods to
94 debug it. for example, add a new ser 94 debug it. for example, add a new serial port support just as
95 arch/mips/boot/compressed/uart-16550 95 arch/mips/boot/compressed/uart-16550.c does.
96 96
97 After the compressed kernel support 97 After the compressed kernel support works, please disable this option
98 to reduce the kernel image size and 98 to reduce the kernel image size and speed up the booting procedure a
99 little. 99 little.
100 100
101 config ZBOOT_INGENIC_UART 101 config ZBOOT_INGENIC_UART
102 int "UART to use for compressed kernel 102 int "UART to use for compressed kernel debugging"
103 depends on DEBUG_ZBOOT && MACH_INGENIC 103 depends on DEBUG_ZBOOT && MACH_INGENIC_SOC
104 default 0 104 default 0
105 range 0 4 105 range 0 4
106 help 106 help
107 Specify the UART that should be used 107 Specify the UART that should be used for compressed kernel debugging.
108 108
109 config SPINLOCK_TEST 109 config SPINLOCK_TEST
110 bool "Enable spinlock timing tests in 110 bool "Enable spinlock timing tests in debugfs"
111 depends on DEBUG_FS 111 depends on DEBUG_FS
112 default n 112 default n
113 help 113 help
114 Add several files to the debugfs to 114 Add several files to the debugfs to test spinlock speed.
115 115
116 config SCACHE_DEBUGFS 116 config SCACHE_DEBUGFS
117 bool "L2 cache debugfs entries" 117 bool "L2 cache debugfs entries"
118 depends on DEBUG_FS 118 depends on DEBUG_FS
119 help 119 help
120 Enable this to allow parts of the L2 120 Enable this to allow parts of the L2 cache configuration, such as
121 whether or not prefetching is enable 121 whether or not prefetching is enabled, to be exposed to userland
122 via debugfs. 122 via debugfs.
123 123
124 If unsure, say N. 124 If unsure, say N.
125 125
126 menuconfig MIPS_CPS_NS16550_BOOL 126 menuconfig MIPS_CPS_NS16550_BOOL
127 bool "CPS SMP NS16550 UART output" 127 bool "CPS SMP NS16550 UART output"
128 depends on MIPS_CPS 128 depends on MIPS_CPS
129 help 129 help
130 Output debug information via an ns16 130 Output debug information via an ns16550 compatible UART if exceptions
131 occur early in the boot process of a 131 occur early in the boot process of a secondary core.
132 132
133 if MIPS_CPS_NS16550_BOOL 133 if MIPS_CPS_NS16550_BOOL
134 134
135 config MIPS_CPS_NS16550 135 config MIPS_CPS_NS16550
136 def_bool MIPS_CPS_NS16550_BASE != 0 136 def_bool MIPS_CPS_NS16550_BASE != 0
137 137
138 config MIPS_CPS_NS16550_BASE 138 config MIPS_CPS_NS16550_BASE
139 hex "UART Base Address" 139 hex "UART Base Address"
140 default 0x1b0003f8 if MIPS_MALTA 140 default 0x1b0003f8 if MIPS_MALTA
141 default 0 141 default 0
142 help 142 help
143 The base address of the ns16550 comp 143 The base address of the ns16550 compatible UART on which to output
144 debug information from the early sta 144 debug information from the early stages of core startup.
145 145
146 This is only used if non-zero. 146 This is only used if non-zero.
147 147
148 config MIPS_CPS_NS16550_SHIFT 148 config MIPS_CPS_NS16550_SHIFT
149 int "UART Register Shift" 149 int "UART Register Shift"
150 default 0 150 default 0
151 help 151 help
152 The number of bits to shift ns16550 152 The number of bits to shift ns16550 register indices by in order to
153 form their addresses. That is, log b 153 form their addresses. That is, log base 2 of the span between
154 adjacent ns16550 registers in the sy 154 adjacent ns16550 registers in the system.
155 155
156 config MIPS_CPS_NS16550_WIDTH 156 config MIPS_CPS_NS16550_WIDTH
157 int "UART Register Width" 157 int "UART Register Width"
158 default 1 158 default 1
159 help 159 help
160 ns16550 registers width. UART regist 160 ns16550 registers width. UART registers IO access methods will be
161 selected in accordance with this par 161 selected in accordance with this parameter. By setting it to 1, 2 or
162 4 UART registers will be accessed by 162 4 UART registers will be accessed by means of lb/sb, lh/sh or lw/sw
163 instructions respectively. Any value 163 instructions respectively. Any value not from that set activates
164 lb/sb instructions. 164 lb/sb instructions.
165 165
166 endif # MIPS_CPS_NS16550_BOOL 166 endif # MIPS_CPS_NS16550_BOOL
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