xref: /openbmc/linux/arch/nios2/Kconfig (revision 88021836) 
1# SPDX-License-Identifier: GPL-2.0
2config NIOS2
3	def_bool y
4	select ARCH_32BIT_OFF_T
5	select ARCH_HAS_DMA_PREP_COHERENT
6	select ARCH_HAS_SYNC_DMA_FOR_CPU
7	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
8	select ARCH_HAS_DMA_SET_UNCACHED
9	select ARCH_NO_SWAP
10	select COMMON_CLK
11	select TIMER_OF
12	select GENERIC_ATOMIC64
13	select GENERIC_CPU_DEVICES
14	select GENERIC_IRQ_PROBE
15	select GENERIC_IRQ_SHOW
16	select HAVE_ARCH_TRACEHOOK
17	select HAVE_ARCH_KGDB
18	select IRQ_DOMAIN
19	select LOCK_MM_AND_FIND_VMA
20	select MODULES_USE_ELF_RELA
21	select OF
22	select OF_EARLY_FLATTREE
23	select SOC_BUS
24	select SPARSE_IRQ
25	select USB_ARCH_HAS_HCD if USB_SUPPORT
26	select CPU_NO_EFFICIENT_FFS
27	select MMU_GATHER_NO_RANGE if MMU
28
29config GENERIC_CSUM
30	def_bool y
31
32config GENERIC_HWEIGHT
33	def_bool y
34
35config GENERIC_CALIBRATE_DELAY
36	def_bool y
37
38config NO_IOPORT_MAP
39	def_bool y
40
41config FPU
42	def_bool n
43
44menu "Kernel features"
45
46source "kernel/Kconfig.hz"
47
48config ARCH_FORCE_MAX_ORDER
49	int "Order of maximal physically contiguous allocations"
50	default "10"
51	help
52	  The kernel page allocator limits the size of maximal physically
53	  contiguous allocations. The limit is called MAX_ORDER and it
54	  defines the maximal power of two of number of pages that can be
55	  allocated as a single contiguous block. This option allows
56	  overriding the default setting when ability to allocate very
57	  large blocks of physically contiguous memory is required.
58
59	  Don't change if unsure.
60
61endmenu
62
63source "arch/nios2/platform/Kconfig.platform"
64
65menu "Processor type and features"
66
67config MMU
68	def_bool y
69
70config NR_CPUS
71	int
72	default "1"
73
74config NIOS2_ALIGNMENT_TRAP
75	bool "Catch alignment trap"
76	default y
77	help
78	  Nios II CPUs cannot fetch/store data which is not bus aligned,
79	  i.e., a 2 or 4 byte fetch must start at an address divisible by
80	  2 or 4. Any non-aligned load/store instructions will be trapped and
81	  emulated in software if you say Y here, which has a performance
82	  impact.
83
84comment "Boot options"
85
86config CMDLINE_BOOL
87	bool "Default bootloader kernel arguments"
88	default y
89
90config CMDLINE
91	string "Default kernel command string"
92	default ""
93	depends on CMDLINE_BOOL
94	help
95	  On some platforms, there is currently no way for the boot loader to
96	  pass arguments to the kernel. For these platforms, you can supply
97	  some command-line options at build time by entering them here.  In
98	  other cases you can specify kernel args so that you don't have
99	  to set them up in board prom initialization routines.
100
101config CMDLINE_FORCE
102	bool "Force default kernel command string"
103	depends on CMDLINE_BOOL
104	help
105	  Set this to have arguments from the default kernel command string
106	  override those passed by the boot loader.
107
108config NIOS2_CMDLINE_IGNORE_DTB
109	bool "Ignore kernel command string from DTB"
110	depends on CMDLINE_BOOL
111	depends on !CMDLINE_FORCE
112	default y
113	help
114	  Set this to ignore the bootargs property from the devicetree's
115	  chosen node and fall back to CMDLINE if nothing is passed.
116
117config NIOS2_PASS_CMDLINE
118	bool "Passed kernel command line from u-boot"
119	help
120	  Use bootargs env variable from u-boot for kernel command line.
121	  will override "Default kernel command string".
122	  Say N if you are unsure.
123
124config NIOS2_BOOT_LINK_OFFSET
125	hex "Link address offset for booting"
126	default "0x00500000"
127	help
128	  This option allows you to set the link address offset of the zImage.
129	  This can be useful if you are on a board which has a small amount of
130	  memory.
131
132endmenu
133
134menu "Advanced setup"
135
136config ADVANCED_OPTIONS
137	bool "Prompt for advanced kernel configuration options"
138
139comment "Default settings for advanced configuration options are used"
140	depends on !ADVANCED_OPTIONS
141
142config NIOS2_KERNEL_MMU_REGION_BASE_BOOL
143	bool "Set custom kernel MMU region base address"
144	depends on ADVANCED_OPTIONS
145	help
146	  This option allows you to set the virtual address of the kernel MMU region.
147
148	  Say N here unless you know what you are doing.
149
150config NIOS2_KERNEL_MMU_REGION_BASE
151	hex "Virtual base address of the kernel MMU region " if NIOS2_KERNEL_MMU_REGION_BASE_BOOL
152	default "0x80000000"
153	help
154	  This option allows you to set the virtual base address of the kernel MMU region.
155
156config NIOS2_KERNEL_REGION_BASE_BOOL
157	bool "Set custom kernel region base address"
158	depends on ADVANCED_OPTIONS
159	help
160	  This option allows you to set the virtual address of the kernel region.
161
162	  Say N here unless you know what you are doing.
163
164config NIOS2_KERNEL_REGION_BASE
165	hex "Virtual base address of the kernel region " if NIOS2_KERNEL_REGION_BASE_BOOL
166	default "0xc0000000"
167
168config NIOS2_IO_REGION_BASE_BOOL
169	bool "Set custom I/O region base address"
170	depends on ADVANCED_OPTIONS
171	help
172	  This option allows you to set the virtual address of the I/O region.
173
174	  Say N here unless you know what you are doing.
175
176config NIOS2_IO_REGION_BASE
177	hex "Virtual base address of the I/O region" if NIOS2_IO_REGION_BASE_BOOL
178	default "0xe0000000"
179
180endmenu
181