1# SPDX-License-Identifier: GPL-2.0
  2
 
 
 
 
  3config EARLY_PRINTK
  4	bool "Early printk" if EXPERT
  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
 17config EARLY_PRINTK_8250
 18	bool
 19	depends on EARLY_PRINTK && USE_GENERIC_EARLY_PRINTK_8250
 20	default y
 21	help
 22	  "8250/16550 and compatible serial early printk driver"
 23	  If you say Y here, it will be possible to use a 8250/16550 serial
 24	  port as the boot console.
 25
 26config USE_GENERIC_EARLY_PRINTK_8250
 27	bool
 28
 29config CMDLINE_BOOL
 30	bool "Built-in kernel command line"
 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
 48config CMDLINE
 49	string "Default kernel command string"
 50	depends on CMDLINE_BOOL
 51	help
 52	  On some platforms, there is currently no way for the boot loader to
 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
 63config CMDLINE_OVERRIDE
 64	bool "Built-in command line overrides firmware arguments"
 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.
 72
 73config SB1XXX_CORELIS
 74	bool "Corelis Debugger"
 75	depends on SIBYTE_SB1xxx_SOC
 76	select DEBUG_KERNEL if !COMPILE_TEST
 77	select DEBUG_INFO if !COMPILE_TEST
 78	help
 79	  Select compile flags that produce code that can be processed by the
 80	  Corelis mksym utility and UDB Emulator.
 81
 82config 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
101config 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
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
116config 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
126menuconfig MIPS_CPS_NS16550_BOOL
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
133if MIPS_CPS_NS16550_BOOL
134
135config MIPS_CPS_NS16550
136	def_bool MIPS_CPS_NS16550_BASE != 0
137
138config MIPS_CPS_NS16550_BASE
139	hex "UART Base Address"
140	default 0x1b0003f8 if MIPS_MALTA
141	default 0
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
146	  This is only used if non-zero.
147
148config MIPS_CPS_NS16550_SHIFT
149	int "UART Register Shift"
150	default 0
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
156config 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
166endif # MIPS_CPS_NS16550_BOOL

  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