1 # SPDX-License-Identifier: GPL-2.0 1 # SPDX-License-Identifier: GPL-2.0
2 2
>> 3 config TRACE_IRQFLAGS_SUPPORT
>> 4 bool
>> 5 default y
>> 6
3 config EARLY_PRINTK 7 config EARLY_PRINTK
4 def_bool y !! 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
>> 21 config 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
>> 30 config USE_GENERIC_EARLY_PRINTK_8250
>> 31 bool
>> 32
>> 33 config 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
>> 52 config 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
>> 67 config 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
>> 77 config 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
>> 86 config 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
>> 105 config 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.
5 112
6 config DEBUG_ENTRY !! 113 config SPINLOCK_TEST
7 bool "Debug low-level entry code" !! 114 bool "Enable spinlock timing tests in debugfs"
8 depends on DEBUG_KERNEL !! 115 depends on DEBUG_FS
9 help !! 116 default n
10 This option enables sanity checks in !! 117 help
11 Some of these sanity checks may slow !! 118 Add several files to the debugfs to test spinlock speed.
12 exits or otherwise impact performanc !! 119
>> 120 config 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.
13 127
14 If unsure, say N. 128 If unsure, say N.
15 129
16 config CIO_INJECT !! 130 menuconfig MIPS_CPS_NS16550_BOOL
17 bool "CIO Inject interfaces" !! 131 bool "CPS SMP NS16550 UART output"
18 depends on DEBUG_KERNEL && DEBUG_FS !! 132 depends on MIPS_CPS
19 help !! 133 help
20 This option provides a debugging fac !! 134 Output debug information via an ns16550 compatible UART if exceptions
21 and instruction responses to the CIO !! 135 occur early in the boot process of a secondary core.
22 debugfs user-interfaces will be at / !! 136
>> 137 if MIPS_CPS_NS16550_BOOL
>> 138
>> 139 config MIPS_CPS_NS16550
>> 140 def_bool MIPS_CPS_NS16550_BASE != 0
>> 141
>> 142 config 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
>> 152 config 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
>> 160 config 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
>> 170 endif # MIPS_CPS_NS16550_BOOL
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