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Commit | Line | Data |
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b2441318 | 1 | # SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | |
4dd92e15 | 3 | config EARLY_PRINTK |
6a108a14 | 4 | bool "Early printk" if EXPERT |
4dd92e15 RB |
5 | depends on SYS_HAS_EARLY_PRINTK |
6 | default y | |
7 | help | |
8 | This option enables special console drivers which allow the kernel | |
9 | to print messages very early in the bootup process. | |
10 | ||
11 | This is useful for kernel debugging when your machine crashes very | |
12 | early before the console code is initialized. For normal operation, | |
13 | it is not recommended because it looks ugly on some machines and | |
14 | doesn't cooperate with an X server. You should normally say N here, | |
15 | unless you want to debug such a crash. | |
16 | ||
7cd93b89 | 17 | config EARLY_PRINTK_8250 |
e6086557 RB |
18 | bool |
19 | depends on EARLY_PRINTK && USE_GENERIC_EARLY_PRINTK_8250 | |
20 | default y | |
7cd93b89 | 21 | help |
e6086557 | 22 | "8250/16550 and compatible serial early printk driver" |
7cd93b89 YY |
23 | If you say Y here, it will be possible to use a 8250/16550 serial |
24 | port as the boot console. | |
25 | ||
e6086557 RB |
26 | config USE_GENERIC_EARLY_PRINTK_8250 |
27 | bool | |
28 | ||
6acc7d48 DV |
29 | config CMDLINE_BOOL |
30 | bool "Built-in kernel command line" | |
6acc7d48 DV |
31 | help |
32 | For most systems, it is firmware or second stage bootloader that | |
33 | by default specifies the kernel command line options. However, | |
34 | it might be necessary or advantageous to either override the | |
35 | default kernel command line or add a few extra options to it. | |
36 | For such cases, this option allows you to hardcode your own | |
37 | command line options directly into the kernel. For that, you | |
38 | should choose 'Y' here, and fill in the extra boot arguments | |
39 | in CONFIG_CMDLINE. | |
40 | ||
41 | The built-in options will be concatenated to the default command | |
42 | line if CMDLINE_OVERRIDE is set to 'N'. Otherwise, the default | |
43 | command line will be ignored and replaced by the built-in string. | |
44 | ||
45 | Most MIPS systems will normally expect 'N' here and rely upon | |
46 | the command line from the firmware or the second-stage bootloader. | |
47 | ||
1da177e4 LT |
48 | config CMDLINE |
49 | string "Default kernel command string" | |
6acc7d48 | 50 | depends on CMDLINE_BOOL |
1da177e4 | 51 | help |
3e7f9b82 | 52 | On some platforms, there is currently no way for the boot loader to |
6acc7d48 DV |
53 | pass arguments to the kernel. For these platforms, and for the cases |
54 | when you want to add some extra options to the command line or ignore | |
55 | the default command line, you can supply some command-line options at | |
56 | build time by entering them here. In other cases you can specify | |
57 | kernel args so that you don't have to set them up in board prom | |
58 | initialization routines. | |
59 | ||
60 | For more information, see the CMDLINE_BOOL and CMDLINE_OVERRIDE | |
61 | options. | |
62 | ||
63 | config CMDLINE_OVERRIDE | |
6b2aac42 | 64 | bool "Built-in command line overrides firmware arguments" |
6acc7d48 DV |
65 | depends on CMDLINE_BOOL |
66 | help | |
67 | By setting this option to 'Y' you will have your kernel ignore | |
68 | command line arguments from firmware or second stage bootloader. | |
69 | Instead, the built-in command line will be used exclusively. | |
70 | ||
71 | Normally, you will choose 'N' here. | |
1da177e4 | 72 | |
1da177e4 LT |
73 | config SB1XXX_CORELIS |
74 | bool "Corelis Debugger" | |
75 | depends on SIBYTE_SB1xxx_SOC | |
e87f69a5 | 76 | select DEBUG_KERNEL if !COMPILE_TEST |
3e441845 | 77 | select DEBUG_INFO if !COMPILE_TEST |
1da177e4 LT |
78 | help |
79 | Select compile flags that produce code that can be processed by the | |
80 | Corelis mksym utility and UDB Emulator. | |
81 | ||
f86a69b1 WZ |
82 | config DEBUG_ZBOOT |
83 | bool "Enable compressed kernel support debugging" | |
84 | depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT | |
85 | default n | |
86 | help | |
87 | If you want to add compressed kernel support to a new board, and the | |
88 | board supports uart16550 compatible serial port, please select | |
89 | SYS_SUPPORTS_ZBOOT_UART16550 for your board and enable this option to | |
90 | debug it. | |
91 | ||
92 | If your board doesn't support uart16550 compatible serial port, you | |
93 | can try to select SYS_SUPPORTS_ZBOOT and use the other methods to | |
94 | debug it. for example, add a new serial port support just as | |
95 | arch/mips/boot/compressed/uart-16550.c does. | |
96 | ||
97 | After the compressed kernel support works, please disable this option | |
98 | to reduce the kernel image size and speed up the booting procedure a | |
99 | little. | |
100 | ||
f92a05b9 PC |
101 | config ZBOOT_INGENIC_UART |
102 | int "UART to use for compressed kernel debugging" | |
103 | depends on DEBUG_ZBOOT && MACH_INGENIC_SOC | |
104 | default 0 | |
105 | range 0 4 | |
106 | help | |
107 | Specify the UART that should be used for compressed kernel debugging. | |
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 | ||
d478b088 PB |
116 | config SCACHE_DEBUGFS |
117 | bool "L2 cache debugfs entries" | |
118 | depends on DEBUG_FS | |
119 | help | |
120 | Enable this to allow parts of the L2 cache configuration, such as | |
121 | whether or not prefetching is enabled, to be exposed to userland | |
122 | via debugfs. | |
123 | ||
124 | If unsure, say N. | |
125 | ||
7e5e371e | 126 | menuconfig MIPS_CPS_NS16550_BOOL |
609cf6f2 PB |
127 | bool "CPS SMP NS16550 UART output" |
128 | depends on MIPS_CPS | |
129 | help | |
130 | Output debug information via an ns16550 compatible UART if exceptions | |
131 | occur early in the boot process of a secondary core. | |
132 | ||
7e5e371e JH |
133 | if MIPS_CPS_NS16550_BOOL |
134 | ||
135 | config MIPS_CPS_NS16550 | |
136 | def_bool MIPS_CPS_NS16550_BASE != 0 | |
609cf6f2 PB |
137 | |
138 | config MIPS_CPS_NS16550_BASE | |
139 | hex "UART Base Address" | |
140 | default 0x1b0003f8 if MIPS_MALTA | |
7e5e371e | 141 | default 0 |
609cf6f2 PB |
142 | help |
143 | The base address of the ns16550 compatible UART on which to output | |
144 | debug information from the early stages of core startup. | |
145 | ||
7e5e371e JH |
146 | This is only used if non-zero. |
147 | ||
609cf6f2 PB |
148 | config MIPS_CPS_NS16550_SHIFT |
149 | int "UART Register Shift" | |
7e5e371e | 150 | default 0 |
609cf6f2 PB |
151 | help |
152 | The number of bits to shift ns16550 register indices by in order to | |
153 | form their addresses. That is, log base 2 of the span between | |
154 | adjacent ns16550 registers in the system. | |
155 | ||
ad42e0a8 SS |
156 | config MIPS_CPS_NS16550_WIDTH |
157 | int "UART Register Width" | |
158 | default 1 | |
159 | help | |
160 | ns16550 registers width. UART registers IO access methods will be | |
161 | selected in accordance with this parameter. By setting it to 1, 2 or | |
162 | 4 UART registers will be accessed by means of lb/sb, lh/sh or lw/sw | |
163 | instructions respectively. Any value not from that set activates | |
164 | lb/sb instructions. | |
165 | ||
7e5e371e | 166 | endif # MIPS_CPS_NS16550_BOOL |