Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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 SPINLOCK_TEST
106 bool "Enable spinlock timing tests in debugfs"
107 depends on DEBUG_FS
108 default n
109 help
110 Add several files to the debugfs to test spinlock speed.
111
112config SCACHE_DEBUGFS
113 bool "L2 cache debugfs entries"
114 depends on DEBUG_FS
115 help
116 Enable this to allow parts of the L2 cache configuration, such as
117 whether or not prefetching is enabled, to be exposed to userland
118 via debugfs.
119
120 If unsure, say N.
121
122menuconfig MIPS_CPS_NS16550_BOOL
123 bool "CPS SMP NS16550 UART output"
124 depends on MIPS_CPS
125 help
126 Output debug information via an ns16550 compatible UART if exceptions
127 occur early in the boot process of a secondary core.
128
129if MIPS_CPS_NS16550_BOOL
130
131config MIPS_CPS_NS16550
132 def_bool MIPS_CPS_NS16550_BASE != 0
133
134config MIPS_CPS_NS16550_BASE
135 hex "UART Base Address"
136 default 0x1b0003f8 if MIPS_MALTA
137 default 0
138 help
139 The base address of the ns16550 compatible UART on which to output
140 debug information from the early stages of core startup.
141
142 This is only used if non-zero.
143
144config MIPS_CPS_NS16550_SHIFT
145 int "UART Register Shift"
146 default 0
147 help
148 The number of bits to shift ns16550 register indices by in order to
149 form their addresses. That is, log base 2 of the span between
150 adjacent ns16550 registers in the system.
151
152config MIPS_CPS_NS16550_WIDTH
153 int "UART Register Width"
154 default 1
155 help
156 ns16550 registers width. UART registers IO access methods will be
157 selected in accordance with this parameter. By setting it to 1, 2 or
158 4 UART registers will be accessed by means of lb/sb, lh/sh or lw/sw
159 instructions respectively. Any value not from that set activates
160 lb/sb instructions.
161
162endif # MIPS_CPS_NS16550_BOOL