xref: /openbmc/linux/arch/nios2/Kconfig (revision 6d99a79c) 
1# SPDX-License-Identifier: GPL-2.0
2config NIOS2
3	def_bool y
4	select ARCH_HAS_SYNC_DMA_FOR_CPU
5	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
6	select ARCH_NO_SWAP
7	select DMA_DIRECT_OPS
8	select TIMER_OF
9	select GENERIC_ATOMIC64
10	select GENERIC_CLOCKEVENTS
11	select GENERIC_CPU_DEVICES
12	select GENERIC_IRQ_PROBE
13	select GENERIC_IRQ_SHOW
14	select GENERIC_STRNCPY_FROM_USER
15	select GENERIC_STRNLEN_USER
16	select HAVE_ARCH_TRACEHOOK
17	select HAVE_ARCH_KGDB
18	select IRQ_DOMAIN
19	select MODULES_USE_ELF_RELA
20	select OF
21	select OF_EARLY_FLATTREE
22	select SOC_BUS
23	select SPARSE_IRQ
24	select USB_ARCH_HAS_HCD if USB_SUPPORT
25	select CPU_NO_EFFICIENT_FFS
26	select ARCH_DISCARD_MEMBLOCK
27
28config GENERIC_CSUM
29	def_bool y
30
31config GENERIC_HWEIGHT
32	def_bool y
33
34config GENERIC_CALIBRATE_DELAY
35	def_bool y
36
37config NO_IOPORT_MAP
38	def_bool y
39
40config HAS_DMA
41	def_bool y
42
43config FPU
44	def_bool n
45
46config RWSEM_GENERIC_SPINLOCK
47	def_bool y
48
49config TRACE_IRQFLAGS_SUPPORT
50	def_bool n
51
52menu "Kernel features"
53
54source "kernel/Kconfig.hz"
55
56config FORCE_MAX_ZONEORDER
57	int "Maximum zone order"
58	range 9 20
59	default "11"
60	help
61	  The kernel memory allocator divides physically contiguous memory
62	  blocks into "zones", where each zone is a power of two number of
63	  pages.  This option selects the largest power of two that the kernel
64	  keeps in the memory allocator.  If you need to allocate very large
65	  blocks of physically contiguous memory, then you may need to
66	  increase this value.
67
68	  This config option is actually maximum order plus one. For example,
69	  a value of 11 means that the largest free memory block is 2^10 pages.
70
71endmenu
72
73source "arch/nios2/platform/Kconfig.platform"
74
75menu "Processor type and features"
76
77config MMU
78	def_bool y
79
80config NR_CPUS
81	int
82	default "1"
83
84config NIOS2_ALIGNMENT_TRAP
85	bool "Catch alignment trap"
86	default y
87	help
88	  Nios II CPUs cannot fetch/store data which is not bus aligned,
89	  i.e., a 2 or 4 byte fetch must start at an address divisible by
90	  2 or 4. Any non-aligned load/store instructions will be trapped and
91	  emulated in software if you say Y here, which has a performance
92	  impact.
93
94comment "Boot options"
95
96config CMDLINE_BOOL
97	bool "Default bootloader kernel arguments"
98	default y
99
100config CMDLINE
101	string "Default kernel command string"
102	default ""
103	depends on CMDLINE_BOOL
104	help
105	  On some platforms, there is currently no way for the boot loader to
106	  pass arguments to the kernel. For these platforms, you can supply
107	  some command-line options at build time by entering them here.  In
108	  other cases you can specify kernel args so that you don't have
109	  to set them up in board prom initialization routines.
110
111config CMDLINE_FORCE
112	bool "Force default kernel command string"
113	depends on CMDLINE_BOOL
114	help
115	  Set this to have arguments from the default kernel command string
116	  override those passed by the boot loader.
117
118config NIOS2_CMDLINE_IGNORE_DTB
119	bool "Ignore kernel command string from DTB"
120	depends on CMDLINE_BOOL
121	depends on !CMDLINE_FORCE
122	default y
123	help
124	  Set this to ignore the bootargs property from the devicetree's
125	  chosen node and fall back to CMDLINE if nothing is passed.
126
127config NIOS2_PASS_CMDLINE
128	bool "Passed kernel command line from u-boot"
129	default n
130	help
131	  Use bootargs env variable from u-boot for kernel command line.
132	  will override "Default kernel command string".
133	  Say N if you are unsure.
134
135config NIOS2_BOOT_LINK_OFFSET
136	hex "Link address offset for booting"
137	default "0x00500000"
138	help
139	  This option allows you to set the link address offset of the zImage.
140	  This can be useful if you are on a board which has a small amount of
141	  memory.
142
143endmenu
144
145menu "Advanced setup"
146
147config ADVANCED_OPTIONS
148	bool "Prompt for advanced kernel configuration options"
149
150comment "Default settings for advanced configuration options are used"
151	depends on !ADVANCED_OPTIONS
152
153config NIOS2_KERNEL_MMU_REGION_BASE_BOOL
154	bool "Set custom kernel MMU region base address"
155	depends on ADVANCED_OPTIONS
156	help
157	  This option allows you to set the virtual address of the kernel MMU region.
158
159	  Say N here unless you know what you are doing.
160
161config NIOS2_KERNEL_MMU_REGION_BASE
162	hex "Virtual base address of the kernel MMU region " if NIOS2_KERNEL_MMU_REGION_BASE_BOOL
163	default "0x80000000"
164	help
165	  This option allows you to set the virtual base address of the kernel MMU region.
166
167config NIOS2_KERNEL_REGION_BASE_BOOL
168	bool "Set custom kernel region base address"
169	depends on ADVANCED_OPTIONS
170	help
171	  This option allows you to set the virtual address of the kernel region.
172
173	  Say N here unless you know what you are doing.
174
175config NIOS2_KERNEL_REGION_BASE
176	hex "Virtual base address of the kernel region " if NIOS2_KERNEL_REGION_BASE_BOOL
177	default "0xc0000000"
178
179config NIOS2_IO_REGION_BASE_BOOL
180	bool "Set custom I/O region base address"
181	depends on ADVANCED_OPTIONS
182	help
183	  This option allows you to set the virtual address of the I/O region.
184
185	  Say N here unless you know what you are doing.
186
187config NIOS2_IO_REGION_BASE
188	hex "Virtual base address of the I/O region" if NIOS2_IO_REGION_BASE_BOOL
189	default "0xe0000000"
190
191endmenu
192