xref: /openbmc/linux/arch/nios2/Kconfig (revision 5ef12cb4) 
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
156comment "Default settings for advanced configuration options are used"
157	depends on !ADVANCED_OPTIONS
158
159config NIOS2_KERNEL_MMU_REGION_BASE_BOOL
160	bool "Set custom kernel MMU region base address"
161	depends on ADVANCED_OPTIONS
162	help
163	  This option allows you to set the virtual address of the kernel MMU region.
164
165	  Say N here unless you know what you are doing.
166
167config NIOS2_KERNEL_MMU_REGION_BASE
168	hex "Virtual base address of the kernel MMU region " if NIOS2_KERNEL_MMU_REGION_BASE_BOOL
169	default "0x80000000"
170	help
171	  This option allows you to set the virtual base address of the kernel MMU region.
172
173config NIOS2_KERNEL_REGION_BASE_BOOL
174	bool "Set custom kernel region base address"
175	depends on ADVANCED_OPTIONS
176	help
177	  This option allows you to set the virtual address of the kernel region.
178
179	  Say N here unless you know what you are doing.
180
181config NIOS2_KERNEL_REGION_BASE
182	hex "Virtual base address of the kernel region " if NIOS2_KERNEL_REGION_BASE_BOOL
183	default "0xc0000000"
184
185config NIOS2_IO_REGION_BASE_BOOL
186	bool "Set custom I/O region base address"
187	depends on ADVANCED_OPTIONS
188	help
189	  This option allows you to set the virtual address of the I/O region.
190
191	  Say N here unless you know what you are doing.
192
193config NIOS2_IO_REGION_BASE
194	hex "Virtual base address of the I/O region" if NIOS2_IO_REGION_BASE_BOOL
195	default "0xe0000000"
196
197endmenu
198
199menu "Executable file formats"
200
201source "fs/Kconfig.binfmt"
202
203endmenu
204
205source "net/Kconfig"
206
207source "drivers/Kconfig"
208
209source "fs/Kconfig"
210
211source "arch/nios2/Kconfig.debug"
212
213source "security/Kconfig"
214
215source "crypto/Kconfig"
216
217source "lib/Kconfig"
218