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 default n 36 help 37 For most systems, it is firmware or second stage bootloader that 38 by default specifies the kernel command line options. However, 39 it might be necessary or advantageous to either override the 40 default kernel command line or add a few extra options to it. 41 For such cases, this option allows you to hardcode your own 42 command line options directly into the kernel. For that, you 43 should choose 'Y' here, and fill in the extra boot arguments 44 in CONFIG_CMDLINE. 45 46 The built-in options will be concatenated to the default command 47 line if CMDLINE_OVERRIDE is set to 'N'. Otherwise, the default 48 command line will be ignored and replaced by the built-in string. 49 50 Most MIPS systems will normally expect 'N' here and rely upon 51 the command line from the firmware or the second-stage bootloader. 52 53config CMDLINE 54 string "Default kernel command string" 55 depends on CMDLINE_BOOL 56 default "" 57 help 58 On some platforms, there is currently no way for the boot loader to 59 pass arguments to the kernel. For these platforms, and for the cases 60 when you want to add some extra options to the command line or ignore 61 the default command line, you can supply some command-line options at 62 build time by entering them here. In other cases you can specify 63 kernel args so that you don't have to set them up in board prom 64 initialization routines. 65 66 For more information, see the CMDLINE_BOOL and CMDLINE_OVERRIDE 67 options. 68 69config CMDLINE_OVERRIDE 70 bool "Built-in command line overrides firmware arguments" 71 default n 72 depends on CMDLINE_BOOL 73 help 74 By setting this option to 'Y' you will have your kernel ignore 75 command line arguments from firmware or second stage bootloader. 76 Instead, the built-in command line will be used exclusively. 77 78 Normally, you will choose 'N' here. 79 80config SB1XXX_CORELIS 81 bool "Corelis Debugger" 82 depends on SIBYTE_SB1xxx_SOC 83 select DEBUG_INFO if !COMPILE_TEST 84 help 85 Select compile flags that produce code that can be processed by the 86 Corelis mksym utility and UDB Emulator. 87 88config DEBUG_ZBOOT 89 bool "Enable compressed kernel support debugging" 90 depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT 91 default n 92 help 93 If you want to add compressed kernel support to a new board, and the 94 board supports uart16550 compatible serial port, please select 95 SYS_SUPPORTS_ZBOOT_UART16550 for your board and enable this option to 96 debug it. 97 98 If your board doesn't support uart16550 compatible serial port, you 99 can try to select SYS_SUPPORTS_ZBOOT and use the other methods to 100 debug it. for example, add a new serial port support just as 101 arch/mips/boot/compressed/uart-16550.c does. 102 103 After the compressed kernel support works, please disable this option 104 to reduce the kernel image size and speed up the booting procedure a 105 little. 106 107config SPINLOCK_TEST 108 bool "Enable spinlock timing tests in debugfs" 109 depends on DEBUG_FS 110 default n 111 help 112 Add several files to the debugfs to test spinlock speed. 113 114config SCACHE_DEBUGFS 115 bool "L2 cache debugfs entries" 116 depends on DEBUG_FS 117 help 118 Enable this to allow parts of the L2 cache configuration, such as 119 whether or not prefetching is enabled, to be exposed to userland 120 via debugfs. 121 122 If unsure, say N. 123 124menuconfig MIPS_CPS_NS16550_BOOL 125 bool "CPS SMP NS16550 UART output" 126 depends on MIPS_CPS 127 help 128 Output debug information via an ns16550 compatible UART if exceptions 129 occur early in the boot process of a secondary core. 130 131if MIPS_CPS_NS16550_BOOL 132 133config MIPS_CPS_NS16550 134 def_bool MIPS_CPS_NS16550_BASE != 0 135 136config MIPS_CPS_NS16550_BASE 137 hex "UART Base Address" 138 default 0x1b0003f8 if MIPS_MALTA 139 default 0 140 help 141 The base address of the ns16550 compatible UART on which to output 142 debug information from the early stages of core startup. 143 144 This is only used if non-zero. 145 146config MIPS_CPS_NS16550_SHIFT 147 int "UART Register Shift" 148 default 0 149 help 150 The number of bits to shift ns16550 register indices by in order to 151 form their addresses. That is, log base 2 of the span between 152 adjacent ns16550 registers in the system. 153 154endif # MIPS_CPS_NS16550_BOOL 155