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Commit | Line | Data |
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b2441318 | 1 | # SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | menu "Kernel hacking" |
3 | ||
192ef366 RB |
4 | config TRACE_IRQFLAGS_SUPPORT |
5 | bool | |
6 | default y | |
7 | ||
1da177e4 LT |
8 | source "lib/Kconfig.debug" |
9 | ||
4dd92e15 | 10 | config EARLY_PRINTK |
6a108a14 | 11 | bool "Early printk" if EXPERT |
4dd92e15 RB |
12 | depends on SYS_HAS_EARLY_PRINTK |
13 | default y | |
14 | help | |
15 | This option enables special console drivers which allow the kernel | |
16 | to print messages very early in the bootup process. | |
17 | ||
18 | This is useful for kernel debugging when your machine crashes very | |
19 | early before the console code is initialized. For normal operation, | |
20 | it is not recommended because it looks ugly on some machines and | |
21 | doesn't cooperate with an X server. You should normally say N here, | |
22 | unless you want to debug such a crash. | |
23 | ||
7cd93b89 | 24 | config EARLY_PRINTK_8250 |
e6086557 RB |
25 | bool |
26 | depends on EARLY_PRINTK && USE_GENERIC_EARLY_PRINTK_8250 | |
27 | default y | |
7cd93b89 | 28 | help |
e6086557 | 29 | "8250/16550 and compatible serial early printk driver" |
7cd93b89 YY |
30 | If you say Y here, it will be possible to use a 8250/16550 serial |
31 | port as the boot console. | |
32 | ||
e6086557 RB |
33 | config USE_GENERIC_EARLY_PRINTK_8250 |
34 | bool | |
35 | ||
6acc7d48 DV |
36 | config CMDLINE_BOOL |
37 | bool "Built-in kernel command line" | |
38 | default n | |
39 | help | |
40 | For most systems, it is firmware or second stage bootloader that | |
41 | by default specifies the kernel command line options. However, | |
42 | it might be necessary or advantageous to either override the | |
43 | default kernel command line or add a few extra options to it. | |
44 | For such cases, this option allows you to hardcode your own | |
45 | command line options directly into the kernel. For that, you | |
46 | should choose 'Y' here, and fill in the extra boot arguments | |
47 | in CONFIG_CMDLINE. | |
48 | ||
49 | The built-in options will be concatenated to the default command | |
50 | line if CMDLINE_OVERRIDE is set to 'N'. Otherwise, the default | |
51 | command line will be ignored and replaced by the built-in string. | |
52 | ||
53 | Most MIPS systems will normally expect 'N' here and rely upon | |
54 | the command line from the firmware or the second-stage bootloader. | |
55 | ||
1da177e4 LT |
56 | config CMDLINE |
57 | string "Default kernel command string" | |
6acc7d48 | 58 | depends on CMDLINE_BOOL |
1da177e4 LT |
59 | default "" |
60 | help | |
3e7f9b82 | 61 | On some platforms, there is currently no way for the boot loader to |
6acc7d48 DV |
62 | pass arguments to the kernel. For these platforms, and for the cases |
63 | when you want to add some extra options to the command line or ignore | |
64 | the default command line, you can supply some command-line options at | |
65 | build time by entering them here. In other cases you can specify | |
66 | kernel args so that you don't have to set them up in board prom | |
67 | initialization routines. | |
68 | ||
69 | For more information, see the CMDLINE_BOOL and CMDLINE_OVERRIDE | |
70 | options. | |
71 | ||
72 | config CMDLINE_OVERRIDE | |
6b2aac42 | 73 | bool "Built-in command line overrides firmware arguments" |
6acc7d48 DV |
74 | default n |
75 | depends on CMDLINE_BOOL | |
76 | help | |
77 | By setting this option to 'Y' you will have your kernel ignore | |
78 | command line arguments from firmware or second stage bootloader. | |
79 | Instead, the built-in command line will be used exclusively. | |
80 | ||
81 | Normally, you will choose 'N' here. | |
1da177e4 | 82 | |
1da177e4 LT |
83 | config SB1XXX_CORELIS |
84 | bool "Corelis Debugger" | |
85 | depends on SIBYTE_SB1xxx_SOC | |
3e441845 | 86 | select DEBUG_INFO if !COMPILE_TEST |
1da177e4 LT |
87 | help |
88 | Select compile flags that produce code that can be processed by the | |
89 | Corelis mksym utility and UDB Emulator. | |
90 | ||
f86a69b1 WZ |
91 | config DEBUG_ZBOOT |
92 | bool "Enable compressed kernel support debugging" | |
93 | depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT | |
94 | default n | |
95 | help | |
96 | If you want to add compressed kernel support to a new board, and the | |
97 | board supports uart16550 compatible serial port, please select | |
98 | SYS_SUPPORTS_ZBOOT_UART16550 for your board and enable this option to | |
99 | debug it. | |
100 | ||
101 | If your board doesn't support uart16550 compatible serial port, you | |
102 | can try to select SYS_SUPPORTS_ZBOOT and use the other methods to | |
103 | debug it. for example, add a new serial port support just as | |
104 | arch/mips/boot/compressed/uart-16550.c does. | |
105 | ||
106 | After the compressed kernel support works, please disable this option | |
107 | to reduce the kernel image size and speed up the booting procedure a | |
108 | little. | |
109 | ||
bba90760 DD |
110 | config SPINLOCK_TEST |
111 | bool "Enable spinlock timing tests in debugfs" | |
112 | depends on DEBUG_FS | |
113 | default n | |
114 | help | |
115 | Add several files to the debugfs to test spinlock speed. | |
116 | ||
d478b088 PB |
117 | config SCACHE_DEBUGFS |
118 | bool "L2 cache debugfs entries" | |
119 | depends on DEBUG_FS | |
120 | help | |
121 | Enable this to allow parts of the L2 cache configuration, such as | |
122 | whether or not prefetching is enabled, to be exposed to userland | |
123 | via debugfs. | |
124 | ||
125 | If unsure, say N. | |
126 | ||
609cf6f2 PB |
127 | menuconfig MIPS_CPS_NS16550 |
128 | bool "CPS SMP NS16550 UART output" | |
129 | depends on MIPS_CPS | |
130 | help | |
131 | Output debug information via an ns16550 compatible UART if exceptions | |
132 | occur early in the boot process of a secondary core. | |
133 | ||
134 | if MIPS_CPS_NS16550 | |
135 | ||
136 | config MIPS_CPS_NS16550_BASE | |
137 | hex "UART Base Address" | |
138 | default 0x1b0003f8 if MIPS_MALTA | |
139 | help | |
140 | The base address of the ns16550 compatible UART on which to output | |
141 | debug information from the early stages of core startup. | |
142 | ||
143 | config MIPS_CPS_NS16550_SHIFT | |
144 | int "UART Register Shift" | |
145 | default 0 if MIPS_MALTA | |
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 | endif # MIPS_CPS_NS16550 | |
152 | ||
1da177e4 | 153 | endmenu |