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_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. 84 85config DEBUG_ZBOOT 86 bool "Enable compressed kernel support debugging" 87 depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT 88 default n 89 help 90 If you want to add compressed kernel support to a new board, and the 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 104config 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 111config 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. 118 119 If unsure, say N. 120 121menuconfig MIPS_CPS_NS16550_BOOL 122 bool "CPS SMP NS16550 UART output" 123 depends on MIPS_CPS 124 help 125 Output debug information via an ns16550 compatible UART if exceptions 126 occur early in the boot process of a secondary core. 127 128if MIPS_CPS_NS16550_BOOL 129 130config MIPS_CPS_NS16550 131 def_bool MIPS_CPS_NS16550_BASE != 0 132 133config 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 143config 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 151endif # MIPS_CPS_NS16550_BOOL 152