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
151config MIPS_CPS_NS16550_WIDTH
152	int "UART Register Width"
153	default 1
154	help
155	  ns16550 registers width. UART registers IO access methods will be
156	  selected in accordance with this parameter. By setting it to 1, 2 or
157	  4 UART registers will be accessed by means of lb/sb, lh/sh or lw/sw
158	  instructions respectively. Any value not from that set activates
159	  lb/sb instructions.
160
161endif # MIPS_CPS_NS16550_BOOL

  1menu "Kernel hacking"
  2
  3config TRACE_IRQFLAGS_SUPPORT
  4	bool
  5	default y
  6
  7source "lib/Kconfig.debug"
  8
  9config EARLY_PRINTK
 10	bool "Early printk" if EXPERT
 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
 23config EARLY_PRINTK_8250
 24	bool
 25	depends on EARLY_PRINTK && USE_GENERIC_EARLY_PRINTK_8250
 26	default y
 27	help
 28	  "8250/16550 and compatible serial early printk driver"
 29	  If you say Y here, it will be possible to use a 8250/16550 serial
 30	  port as the boot console.
 31
 32config USE_GENERIC_EARLY_PRINTK_8250
 33	bool
 34
 35config 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
 55config CMDLINE
 56	string "Default kernel command string"
 57	depends on CMDLINE_BOOL
 58	default ""
 59	help
 60	  On some platforms, there is currently no way for the boot loader to
 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
 71config CMDLINE_OVERRIDE
 72	bool "Built-in command line overrides firmware arguments"
 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.
 81
 82config 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
 90config 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
109config 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
116if CPU_MIPSR6
117
118choice
119	prompt "Compact branch policy"
120	default MIPS_COMPACT_BRANCHES_OPTIMAL
121
122config 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
131config 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
140config 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
148endchoice
149
150endif # CPU_MIPSR6
151
152config 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
162menuconfig 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
169if MIPS_CPS_NS16550
 
 
 
170
171config 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
 
 
178config 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
186endif # MIPS_CPS_NS16550
 
 
 
 
 
 
 
 
187
188endmenu