xref: /openbmc/linux/arch/nios2/Kconfig (revision f5ad1c74) 
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_CLOCKEVENTS
14	select GENERIC_CPU_DEVICES
15	select GENERIC_IRQ_PROBE
16	select GENERIC_IRQ_SHOW
17	select GENERIC_STRNCPY_FROM_USER
18	select GENERIC_STRNLEN_USER
19	select HAVE_ARCH_TRACEHOOK
20	select HAVE_ARCH_KGDB
21	select IRQ_DOMAIN
22	select MODULES_USE_ELF_RELA
23	select OF
24	select OF_EARLY_FLATTREE
25	select SOC_BUS
26	select SPARSE_IRQ
27	select USB_ARCH_HAS_HCD if USB_SUPPORT
28	select CPU_NO_EFFICIENT_FFS
29	select MMU_GATHER_NO_RANGE if MMU
30	select SET_FS
31
32config GENERIC_CSUM
33	def_bool y
34
35config GENERIC_HWEIGHT
36	def_bool y
37
38config GENERIC_CALIBRATE_DELAY
39	def_bool y
40
41config NO_IOPORT_MAP
42	def_bool y
43
44config FPU
45	def_bool n
46
47config TRACE_IRQFLAGS_SUPPORT
48	def_bool n
49
50menu "Kernel features"
51
52source "kernel/Kconfig.hz"
53
54config FORCE_MAX_ZONEORDER
55	int "Maximum zone order"
56	range 9 20
57	default "11"
58	help
59	  The kernel memory allocator divides physically contiguous memory
60	  blocks into "zones", where each zone is a power of two number of
61	  pages.  This option selects the largest power of two that the kernel
62	  keeps in the memory allocator.  If you need to allocate very large
63	  blocks of physically contiguous memory, then you may need to
64	  increase this value.
65
66	  This config option is actually maximum order plus one. For example,
67	  a value of 11 means that the largest free memory block is 2^10 pages.
68
69endmenu
70
71source "arch/nios2/platform/Kconfig.platform"
72
73menu "Processor type and features"
74
75config MMU
76	def_bool y
77
78config NR_CPUS
79	int
80	default "1"
81
82config NIOS2_ALIGNMENT_TRAP
83	bool "Catch alignment trap"
84	default y
85	help
86	  Nios II CPUs cannot fetch/store data which is not bus aligned,
87	  i.e., a 2 or 4 byte fetch must start at an address divisible by
88	  2 or 4. Any non-aligned load/store instructions will be trapped and
89	  emulated in software if you say Y here, which has a performance
90	  impact.
91
92comment "Boot options"
93
94config CMDLINE_BOOL
95	bool "Default bootloader kernel arguments"
96	default y
97
98config CMDLINE
99	string "Default kernel command string"
100	default ""
101	depends on CMDLINE_BOOL
102	help
103	  On some platforms, there is currently no way for the boot loader to
104	  pass arguments to the kernel. For these platforms, you can supply
105	  some command-line options at build time by entering them here.  In
106	  other cases you can specify kernel args so that you don't have
107	  to set them up in board prom initialization routines.
108
109config CMDLINE_FORCE
110	bool "Force default kernel command string"
111	depends on CMDLINE_BOOL
112	help
113	  Set this to have arguments from the default kernel command string
114	  override those passed by the boot loader.
115
116config NIOS2_CMDLINE_IGNORE_DTB
117	bool "Ignore kernel command string from DTB"
118	depends on CMDLINE_BOOL
119	depends on !CMDLINE_FORCE
120	default y
121	help
122	  Set this to ignore the bootargs property from the devicetree's
123	  chosen node and fall back to CMDLINE if nothing is passed.
124
125config NIOS2_PASS_CMDLINE
126	bool "Passed kernel command line from u-boot"
127	help
128	  Use bootargs env variable from u-boot for kernel command line.
129	  will override "Default kernel command string".
130	  Say N if you are unsure.
131
132config NIOS2_BOOT_LINK_OFFSET
133	hex "Link address offset for booting"
134	default "0x00500000"
135	help
136	  This option allows you to set the link address offset of the zImage.
137	  This can be useful if you are on a board which has a small amount of
138	  memory.
139
140endmenu
141
142menu "Advanced setup"
143
144config ADVANCED_OPTIONS
145	bool "Prompt for advanced kernel configuration options"
146
147comment "Default settings for advanced configuration options are used"
148	depends on !ADVANCED_OPTIONS
149
150config NIOS2_KERNEL_MMU_REGION_BASE_BOOL
151	bool "Set custom kernel MMU region base address"
152	depends on ADVANCED_OPTIONS
153	help
154	  This option allows you to set the virtual address of the kernel MMU region.
155
156	  Say N here unless you know what you are doing.
157
158config NIOS2_KERNEL_MMU_REGION_BASE
159	hex "Virtual base address of the kernel MMU region " if NIOS2_KERNEL_MMU_REGION_BASE_BOOL
160	default "0x80000000"
161	help
162	  This option allows you to set the virtual base address of the kernel MMU region.
163
164config NIOS2_KERNEL_REGION_BASE_BOOL
165	bool "Set custom kernel region base address"
166	depends on ADVANCED_OPTIONS
167	help
168	  This option allows you to set the virtual address of the kernel region.
169
170	  Say N here unless you know what you are doing.
171
172config NIOS2_KERNEL_REGION_BASE
173	hex "Virtual base address of the kernel region " if NIOS2_KERNEL_REGION_BASE_BOOL
174	default "0xc0000000"
175
176config NIOS2_IO_REGION_BASE_BOOL
177	bool "Set custom I/O region base address"
178	depends on ADVANCED_OPTIONS
179	help
180	  This option allows you to set the virtual address of the I/O region.
181
182	  Say N here unless you know what you are doing.
183
184config NIOS2_IO_REGION_BASE
185	hex "Virtual base address of the I/O region" if NIOS2_IO_REGION_BASE_BOOL
186	default "0xe0000000"
187
188endmenu
189