1 # SPDX-License-Identifier: GPL-2.0
3 config TRACE_IRQFLAGS_SUPPORT
8 bool "Early printk" if EXPERT
9 depends on SYS_HAS_EARLY_PRINTK
12 This option enables special console drivers which allow the kernel
13 to print messages very early in the bootup process.
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.
21 config EARLY_PRINTK_8250
23 depends on EARLY_PRINTK && USE_GENERIC_EARLY_PRINTK_8250
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.
30 config USE_GENERIC_EARLY_PRINTK_8250
34 bool "Built-in kernel command line"
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
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.
49 Most MIPS systems will normally expect 'N' here and rely upon
50 the command line from the firmware or the second-stage bootloader.
53 string "Default kernel command string"
54 depends on CMDLINE_BOOL
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.
64 For more information, see the CMDLINE_BOOL and CMDLINE_OVERRIDE
67 config CMDLINE_OVERRIDE
68 bool "Built-in command line overrides firmware arguments"
69 depends on CMDLINE_BOOL
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.
75 Normally, you will choose 'N' here.
78 bool "Corelis Debugger"
79 depends on SIBYTE_SB1xxx_SOC
80 select DEBUG_KERNEL if !COMPILE_TEST
81 select DEBUG_INFO if !COMPILE_TEST
83 Select compile flags that produce code that can be processed by the
84 Corelis mksym utility and UDB Emulator.
87 bool "Enable compressed kernel support debugging"
88 depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT
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
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.
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
105 config ZBOOT_INGENIC_UART
106 int "UART to use for compressed kernel debugging"
107 depends on DEBUG_ZBOOT && MACH_INGENIC_SOC
111 Specify the UART that should be used for compressed kernel debugging.
114 bool "Enable spinlock timing tests in debugfs"
118 Add several files to the debugfs to test spinlock speed.
120 config SCACHE_DEBUGFS
121 bool "L2 cache debugfs entries"
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
130 menuconfig MIPS_CPS_NS16550_BOOL
131 bool "CPS SMP NS16550 UART output"
134 Output debug information via an ns16550 compatible UART if exceptions
135 occur early in the boot process of a secondary core.
137 if MIPS_CPS_NS16550_BOOL
139 config MIPS_CPS_NS16550
140 def_bool MIPS_CPS_NS16550_BASE != 0
142 config MIPS_CPS_NS16550_BASE
143 hex "UART Base Address"
144 default 0x1b0003f8 if MIPS_MALTA
147 The base address of the ns16550 compatible UART on which to output
148 debug information from the early stages of core startup.
150 This is only used if non-zero.
152 config MIPS_CPS_NS16550_SHIFT
153 int "UART Register Shift"
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.
160 config MIPS_CPS_NS16550_WIDTH
161 int "UART Register Width"
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
170 endif # MIPS_CPS_NS16550_BOOL