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_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 86config 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 105config 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. 112 113config SPINLOCK_TEST 114 bool "Enable spinlock timing tests in debugfs" 115 depends on DEBUG_FS 116 default n 117 help 118 Add several files to the debugfs to test spinlock speed. 119 120config 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. 127 128 If unsure, say N. 129 130menuconfig MIPS_CPS_NS16550_BOOL 131 bool "CPS SMP NS16550 UART output" 132 depends on MIPS_CPS 133 help 134 Output debug information via an ns16550 compatible UART if exceptions 135 occur early in the boot process of a secondary core. 136 137if MIPS_CPS_NS16550_BOOL 138 139config MIPS_CPS_NS16550 140 def_bool MIPS_CPS_NS16550_BASE != 0 141 142config 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 152config 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 160config 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 170endif # MIPS_CPS_NS16550_BOOL 171