xref: /openbmc/linux/arch/nios2/Kconfig (revision 6f52b16c) 
1# SPDX-License-Identifier: GPL-2.0
2config NIOS2
3	def_bool y
4	select TIMER_OF
5	select GENERIC_ATOMIC64
6	select GENERIC_CLOCKEVENTS
7	select GENERIC_CPU_DEVICES
8	select GENERIC_IRQ_PROBE
9	select GENERIC_IRQ_SHOW
10	select GENERIC_STRNCPY_FROM_USER
11	select GENERIC_STRNLEN_USER
12	select HAVE_ARCH_TRACEHOOK
13	select HAVE_ARCH_KGDB
14	select IRQ_DOMAIN
15	select MODULES_USE_ELF_RELA
16	select OF
17	select OF_EARLY_FLATTREE
18	select SOC_BUS
19	select SPARSE_IRQ
20	select USB_ARCH_HAS_HCD if USB_SUPPORT
21	select CPU_NO_EFFICIENT_FFS
22
23config GENERIC_CSUM
24	def_bool y
25
26config GENERIC_HWEIGHT
27	def_bool y
28
29config GENERIC_CALIBRATE_DELAY
30	def_bool y
31
32config NO_IOPORT_MAP
33	def_bool y
34
35config HAS_DMA
36	def_bool y
37
38config FPU
39	def_bool n
40
41config SWAP
42	def_bool n
43
44config RWSEM_GENERIC_SPINLOCK
45	def_bool y
46
47config TRACE_IRQFLAGS_SUPPORT
48	def_bool n
49
50source "init/Kconfig"
51
52menu "Kernel features"
53
54source "kernel/Kconfig.preempt"
55
56source "kernel/Kconfig.freezer"
57
58source "kernel/Kconfig.hz"
59
60source "mm/Kconfig"
61
62config FORCE_MAX_ZONEORDER
63	int "Maximum zone order"
64	range 9 20
65	default "11"
66	help
67	  The kernel memory allocator divides physically contiguous memory
68	  blocks into "zones", where each zone is a power of two number of
69	  pages.  This option selects the largest power of two that the kernel
70	  keeps in the memory allocator.  If you need to allocate very large
71	  blocks of physically contiguous memory, then you may need to
72	  increase this value.
73
74	  This config option is actually maximum order plus one. For example,
75	  a value of 11 means that the largest free memory block is 2^10 pages.
76
77endmenu
78
79source "arch/nios2/platform/Kconfig.platform"
80
81menu "Processor type and features"
82
83config MMU
84	def_bool y
85
86config NR_CPUS
87	int
88	default "1"
89
90config NIOS2_ALIGNMENT_TRAP
91	bool "Catch alignment trap"
92	default y
93	help
94	  Nios II CPUs cannot fetch/store data which is not bus aligned,
95	  i.e., a 2 or 4 byte fetch must start at an address divisible by
96	  2 or 4. Any non-aligned load/store instructions will be trapped and
97	  emulated in software if you say Y here, which has a performance
98	  impact.
99
100comment "Boot options"
101
102config CMDLINE_BOOL
103	bool "Default bootloader kernel arguments"
104	default y
105
106config CMDLINE
107	string "Default kernel command string"
108	default ""
109	depends on CMDLINE_BOOL
110	help
111	  On some platforms, there is currently no way for the boot loader to
112	  pass arguments to the kernel. For these platforms, you can supply
113	  some command-line options at build time by entering them here.  In
114	  other cases you can specify kernel args so that you don't have
115	  to set them up in board prom initialization routines.
116
117config CMDLINE_FORCE
118	bool "Force default kernel command string"
119	depends on CMDLINE_BOOL
120	help
121	  Set this to have arguments from the default kernel command string
122	  override those passed by the boot loader.
123
124config NIOS2_CMDLINE_IGNORE_DTB
125	bool "Ignore kernel command string from DTB"
126	depends on CMDLINE_BOOL
127	depends on !CMDLINE_FORCE
128	default y
129	help
130	  Set this to ignore the bootargs property from the devicetree's
131	  chosen node and fall back to CMDLINE if nothing is passed.
132
133config NIOS2_PASS_CMDLINE
134	bool "Passed kernel command line from u-boot"
135	default n
136	help
137	  Use bootargs env variable from u-boot for kernel command line.
138	  will override "Default kernel command string".
139	  Say N if you are unsure.
140
141config NIOS2_BOOT_LINK_OFFSET
142	hex "Link address offset for booting"
143	default "0x00500000"
144	help
145	  This option allows you to set the link address offset of the zImage.
146	  This can be useful if you are on a board which has a small amount of
147	  memory.
148
149endmenu
150
151menu "Advanced setup"
152
153config ADVANCED_OPTIONS
154	bool "Prompt for advanced kernel configuration options"
155	help
156
157comment "Default settings for advanced configuration options are used"
158	depends on !ADVANCED_OPTIONS
159
160config NIOS2_KERNEL_MMU_REGION_BASE_BOOL
161	bool "Set custom kernel MMU region base address"
162	depends on ADVANCED_OPTIONS
163	help
164	  This option allows you to set the virtual address of the kernel MMU region.
165
166	  Say N here unless you know what you are doing.
167
168config NIOS2_KERNEL_MMU_REGION_BASE
169	hex "Virtual base address of the kernel MMU region " if NIOS2_KERNEL_MMU_REGION_BASE_BOOL
170	default "0x80000000"
171	help
172	  This option allows you to set the virtual base address of the kernel MMU region.
173
174config NIOS2_KERNEL_REGION_BASE_BOOL
175	bool "Set custom kernel region base address"
176	depends on ADVANCED_OPTIONS
177	help
178	  This option allows you to set the virtual address of the kernel region.
179
180	  Say N here unless you know what you are doing.
181
182config NIOS2_KERNEL_REGION_BASE
183	hex "Virtual base address of the kernel region " if NIOS2_KERNEL_REGION_BASE_BOOL
184	default "0xc0000000"
185
186config NIOS2_IO_REGION_BASE_BOOL
187	bool "Set custom I/O region base address"
188	depends on ADVANCED_OPTIONS
189	help
190	  This option allows you to set the virtual address of the I/O region.
191
192	  Say N here unless you know what you are doing.
193
194config NIOS2_IO_REGION_BASE
195	hex "Virtual base address of the I/O region" if NIOS2_IO_REGION_BASE_BOOL
196	default "0xe0000000"
197
198endmenu
199
200menu "Executable file formats"
201
202source "fs/Kconfig.binfmt"
203
204endmenu
205
206source "net/Kconfig"
207
208source "drivers/Kconfig"
209
210source "fs/Kconfig"
211
212source "arch/nios2/Kconfig.debug"
213
214source "security/Kconfig"
215
216source "crypto/Kconfig"
217
218source "lib/Kconfig"
219