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Commit | Line | Data |
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1da177e4 LT |
1 | menu "Kernel hacking" |
2 | ||
192ef366 RB |
3 | config TRACE_IRQFLAGS_SUPPORT |
4 | bool | |
5 | default y | |
6 | ||
1da177e4 LT |
7 | source "lib/Kconfig.debug" |
8 | ||
4dd92e15 | 9 | config EARLY_PRINTK |
6a108a14 | 10 | bool "Early printk" if EXPERT |
4dd92e15 RB |
11 | depends on SYS_HAS_EARLY_PRINTK |
12 | default y | |
13 | help | |
14 | This option enables special console drivers which allow the kernel | |
15 | to print messages very early in the bootup process. | |
16 | ||
17 | This is useful for kernel debugging when your machine crashes very | |
18 | early before the console code is initialized. For normal operation, | |
19 | it is not recommended because it looks ugly on some machines and | |
20 | doesn't cooperate with an X server. You should normally say N here, | |
21 | unless you want to debug such a crash. | |
22 | ||
7cd93b89 | 23 | config EARLY_PRINTK_8250 |
e6086557 RB |
24 | bool |
25 | depends on EARLY_PRINTK && USE_GENERIC_EARLY_PRINTK_8250 | |
26 | default y | |
7cd93b89 | 27 | help |
e6086557 | 28 | "8250/16550 and compatible serial early printk driver" |
7cd93b89 YY |
29 | If you say Y here, it will be possible to use a 8250/16550 serial |
30 | port as the boot console. | |
31 | ||
e6086557 RB |
32 | config USE_GENERIC_EARLY_PRINTK_8250 |
33 | bool | |
34 | ||
6acc7d48 DV |
35 | config CMDLINE_BOOL |
36 | bool "Built-in kernel command line" | |
37 | default n | |
38 | help | |
39 | For most systems, it is firmware or second stage bootloader that | |
40 | by default specifies the kernel command line options. However, | |
41 | it might be necessary or advantageous to either override the | |
42 | default kernel command line or add a few extra options to it. | |
43 | For such cases, this option allows you to hardcode your own | |
44 | command line options directly into the kernel. For that, you | |
45 | should choose 'Y' here, and fill in the extra boot arguments | |
46 | in CONFIG_CMDLINE. | |
47 | ||
48 | The built-in options will be concatenated to the default command | |
49 | line if CMDLINE_OVERRIDE is set to 'N'. Otherwise, the default | |
50 | command line will be ignored and replaced by the built-in string. | |
51 | ||
52 | Most MIPS systems will normally expect 'N' here and rely upon | |
53 | the command line from the firmware or the second-stage bootloader. | |
54 | ||
1da177e4 LT |
55 | config CMDLINE |
56 | string "Default kernel command string" | |
6acc7d48 | 57 | depends on CMDLINE_BOOL |
1da177e4 LT |
58 | default "" |
59 | help | |
3e7f9b82 | 60 | On some platforms, there is currently no way for the boot loader to |
6acc7d48 DV |
61 | pass arguments to the kernel. For these platforms, and for the cases |
62 | when you want to add some extra options to the command line or ignore | |
63 | the default command line, you can supply some command-line options at | |
64 | build time by entering them here. In other cases you can specify | |
65 | kernel args so that you don't have to set them up in board prom | |
66 | initialization routines. | |
67 | ||
68 | For more information, see the CMDLINE_BOOL and CMDLINE_OVERRIDE | |
69 | options. | |
70 | ||
71 | config CMDLINE_OVERRIDE | |
6b2aac42 | 72 | bool "Built-in command line overrides firmware arguments" |
6acc7d48 DV |
73 | default n |
74 | depends on CMDLINE_BOOL | |
75 | help | |
76 | By setting this option to 'Y' you will have your kernel ignore | |
77 | command line arguments from firmware or second stage bootloader. | |
78 | Instead, the built-in command line will be used exclusively. | |
79 | ||
80 | Normally, you will choose 'N' here. | |
1da177e4 | 81 | |
1da177e4 LT |
82 | config SB1XXX_CORELIS |
83 | bool "Corelis Debugger" | |
84 | depends on SIBYTE_SB1xxx_SOC | |
85 | select DEBUG_INFO | |
86 | help | |
87 | Select compile flags that produce code that can be processed by the | |
88 | Corelis mksym utility and UDB Emulator. | |
89 | ||
f86a69b1 WZ |
90 | config DEBUG_ZBOOT |
91 | bool "Enable compressed kernel support debugging" | |
92 | depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT | |
93 | default n | |
94 | help | |
95 | If you want to add compressed kernel support to a new board, and the | |
96 | board supports uart16550 compatible serial port, please select | |
97 | SYS_SUPPORTS_ZBOOT_UART16550 for your board and enable this option to | |
98 | debug it. | |
99 | ||
100 | If your board doesn't support uart16550 compatible serial port, you | |
101 | can try to select SYS_SUPPORTS_ZBOOT and use the other methods to | |
102 | debug it. for example, add a new serial port support just as | |
103 | arch/mips/boot/compressed/uart-16550.c does. | |
104 | ||
105 | After the compressed kernel support works, please disable this option | |
106 | to reduce the kernel image size and speed up the booting procedure a | |
107 | little. | |
108 | ||
bba90760 DD |
109 | config SPINLOCK_TEST |
110 | bool "Enable spinlock timing tests in debugfs" | |
111 | depends on DEBUG_FS | |
112 | default n | |
113 | help | |
114 | Add several files to the debugfs to test spinlock speed. | |
115 | ||
c1a0e9bc PB |
116 | if CPU_MIPSR6 |
117 | ||
118 | choice | |
119 | prompt "Compact branch policy" | |
120 | default MIPS_COMPACT_BRANCHES_OPTIMAL | |
121 | ||
122 | config MIPS_COMPACT_BRANCHES_NEVER | |
123 | bool "Never (force delay slot branches)" | |
124 | help | |
125 | Pass the -mcompact-branches=never flag to the compiler in order to | |
126 | force it to always emit branches with delay slots, and make no use | |
127 | of the compact branch instructions introduced by MIPSr6. This is | |
128 | useful if you suspect there may be an issue with compact branches in | |
129 | either the compiler or the CPU. | |
130 | ||
131 | config MIPS_COMPACT_BRANCHES_OPTIMAL | |
132 | bool "Optimal (use where beneficial)" | |
133 | help | |
134 | Pass the -mcompact-branches=optimal flag to the compiler in order for | |
135 | it to make use of compact branch instructions where it deems them | |
136 | beneficial, and use branches with delay slots elsewhere. This is the | |
137 | default compiler behaviour, and should be used unless you have a | |
138 | reason to choose otherwise. | |
139 | ||
140 | config MIPS_COMPACT_BRANCHES_ALWAYS | |
141 | bool "Always (force compact branches)" | |
142 | help | |
143 | Pass the -mcompact-branches=always flag to the compiler in order to | |
144 | force it to always emit compact branches, making no use of branch | |
145 | instructions with delay slots. This can result in more compact code | |
146 | which may be beneficial in some scenarios. | |
147 | ||
148 | endchoice | |
149 | ||
150 | endif # CPU_MIPSR6 | |
151 | ||
d478b088 PB |
152 | config SCACHE_DEBUGFS |
153 | bool "L2 cache debugfs entries" | |
154 | depends on DEBUG_FS | |
155 | help | |
156 | Enable this to allow parts of the L2 cache configuration, such as | |
157 | whether or not prefetching is enabled, to be exposed to userland | |
158 | via debugfs. | |
159 | ||
160 | If unsure, say N. | |
161 | ||
609cf6f2 PB |
162 | menuconfig MIPS_CPS_NS16550 |
163 | bool "CPS SMP NS16550 UART output" | |
164 | depends on MIPS_CPS | |
165 | help | |
166 | Output debug information via an ns16550 compatible UART if exceptions | |
167 | occur early in the boot process of a secondary core. | |
168 | ||
169 | if MIPS_CPS_NS16550 | |
170 | ||
171 | config MIPS_CPS_NS16550_BASE | |
172 | hex "UART Base Address" | |
173 | default 0x1b0003f8 if MIPS_MALTA | |
174 | help | |
175 | The base address of the ns16550 compatible UART on which to output | |
176 | debug information from the early stages of core startup. | |
177 | ||
178 | config MIPS_CPS_NS16550_SHIFT | |
179 | int "UART Register Shift" | |
180 | default 0 if MIPS_MALTA | |
181 | help | |
182 | The number of bits to shift ns16550 register indices by in order to | |
183 | form their addresses. That is, log base 2 of the span between | |
184 | adjacent ns16550 registers in the system. | |
185 | ||
186 | endif # MIPS_CPS_NS16550 | |
187 | ||
1da177e4 | 188 | endmenu |