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_INFO if !COMPILE_TEST
>> 81 help
>> 82 Select compile flags that produce code that can be processed by the
>> 83 Corelis mksym utility and UDB Emulator.
5 84
6 config DEBUG_ENTRY !! 85 config DEBUG_ZBOOT
7 bool "Debug low-level entry code" !! 86 bool "Enable compressed kernel support debugging"
8 depends on DEBUG_KERNEL !! 87 depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT
9 help !! 88 default n
10 This option enables sanity checks in !! 89 help
11 Some of these sanity checks may slow !! 90 If you want to add compressed kernel support to a new board, and the
12 exits or otherwise impact performanc !! 91 board supports uart16550 compatible serial port, please select
>> 92 SYS_SUPPORTS_ZBOOT_UART16550 for your board and enable this option to
>> 93 debug it.
>> 94
>> 95 If your board doesn't support uart16550 compatible serial port, you
>> 96 can try to select SYS_SUPPORTS_ZBOOT and use the other methods to
>> 97 debug it. for example, add a new serial port support just as
>> 98 arch/mips/boot/compressed/uart-16550.c does.
>> 99
>> 100 After the compressed kernel support works, please disable this option
>> 101 to reduce the kernel image size and speed up the booting procedure a
>> 102 little.
>> 103
>> 104 config SPINLOCK_TEST
>> 105 bool "Enable spinlock timing tests in debugfs"
>> 106 depends on DEBUG_FS
>> 107 default n
>> 108 help
>> 109 Add several files to the debugfs to test spinlock speed.
>> 110
>> 111 config SCACHE_DEBUGFS
>> 112 bool "L2 cache debugfs entries"
>> 113 depends on DEBUG_FS
>> 114 help
>> 115 Enable this to allow parts of the L2 cache configuration, such as
>> 116 whether or not prefetching is enabled, to be exposed to userland
>> 117 via debugfs.
13 118
14 If unsure, say N. 119 If unsure, say N.
15 120
16 config CIO_INJECT !! 121 menuconfig MIPS_CPS_NS16550_BOOL
17 bool "CIO Inject interfaces" !! 122 bool "CPS SMP NS16550 UART output"
18 depends on DEBUG_KERNEL && DEBUG_FS !! 123 depends on MIPS_CPS
19 help !! 124 help
20 This option provides a debugging fac !! 125 Output debug information via an ns16550 compatible UART if exceptions
21 and instruction responses to the CIO !! 126 occur early in the boot process of a secondary core.
22 debugfs user-interfaces will be at / !! 127
>> 128 if MIPS_CPS_NS16550_BOOL
>> 129
>> 130 config MIPS_CPS_NS16550
>> 131 def_bool MIPS_CPS_NS16550_BASE != 0
>> 132
>> 133 config MIPS_CPS_NS16550_BASE
>> 134 hex "UART Base Address"
>> 135 default 0x1b0003f8 if MIPS_MALTA
>> 136 default 0
>> 137 help
>> 138 The base address of the ns16550 compatible UART on which to output
>> 139 debug information from the early stages of core startup.
>> 140
>> 141 This is only used if non-zero.
>> 142
>> 143 config MIPS_CPS_NS16550_SHIFT
>> 144 int "UART Register Shift"
>> 145 default 0
>> 146 help
>> 147 The number of bits to shift ns16550 register indices by in order to
>> 148 form their addresses. That is, log base 2 of the span between
>> 149 adjacent ns16550 registers in the system.
>> 150
>> 151 config MIPS_CPS_NS16550_WIDTH
>> 152 int "UART Register Width"
>> 153 default 1
>> 154 help
>> 155 ns16550 registers width. UART registers IO access methods will be
>> 156 selected in accordance with this parameter. By setting it to 1, 2 or
>> 157 4 UART registers will be accessed by means of lb/sb, lh/sh or lw/sw
>> 158 instructions respectively. Any value not from that set activates
>> 159 lb/sb instructions.
>> 160
>> 161 endif # MIPS_CPS_NS16550_BOOL
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