xref: /openbmc/linux/arch/nios2/Kconfig (revision 6b342707) 
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 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 MMU_GATHER_NO_RANGE if MMU
27	select SET_FS
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 FORCE_MAX_ZONEORDER
49	int "Maximum zone order"
50	range 9 20
51	default "11"
52	help
53	  The kernel memory allocator divides physically contiguous memory
54	  blocks into "zones", where each zone is a power of two number of
55	  pages.  This option selects the largest power of two that the kernel
56	  keeps in the memory allocator.  If you need to allocate very large
57	  blocks of physically contiguous memory, then you may need to
58	  increase this value.
59
60	  This config option is actually maximum order plus one. For example,
61	  a value of 11 means that the largest free memory block is 2^10 pages.
62
63endmenu
64
65source "arch/nios2/platform/Kconfig.platform"
66
67menu "Processor type and features"
68
69config MMU
70	def_bool y
71
72config NR_CPUS
73	int
74	default "1"
75
76config NIOS2_ALIGNMENT_TRAP
77	bool "Catch alignment trap"
78	default y
79	help
80	  Nios II CPUs cannot fetch/store data which is not bus aligned,
81	  i.e., a 2 or 4 byte fetch must start at an address divisible by
82	  2 or 4. Any non-aligned load/store instructions will be trapped and
83	  emulated in software if you say Y here, which has a performance
84	  impact.
85
86comment "Boot options"
87
88config CMDLINE_BOOL
89	bool "Default bootloader kernel arguments"
90	default y
91
92config CMDLINE
93	string "Default kernel command string"
94	default ""
95	depends on CMDLINE_BOOL
96	help
97	  On some platforms, there is currently no way for the boot loader to
98	  pass arguments to the kernel. For these platforms, you can supply
99	  some command-line options at build time by entering them here.  In
100	  other cases you can specify kernel args so that you don't have
101	  to set them up in board prom initialization routines.
102
103config CMDLINE_FORCE
104	bool "Force default kernel command string"
105	depends on CMDLINE_BOOL
106	help
107	  Set this to have arguments from the default kernel command string
108	  override those passed by the boot loader.
109
110config NIOS2_CMDLINE_IGNORE_DTB
111	bool "Ignore kernel command string from DTB"
112	depends on CMDLINE_BOOL
113	depends on !CMDLINE_FORCE
114	default y
115	help
116	  Set this to ignore the bootargs property from the devicetree's
117	  chosen node and fall back to CMDLINE if nothing is passed.
118
119config NIOS2_PASS_CMDLINE
120	bool "Passed kernel command line from u-boot"
121	help
122	  Use bootargs env variable from u-boot for kernel command line.
123	  will override "Default kernel command string".
124	  Say N if you are unsure.
125
126config NIOS2_BOOT_LINK_OFFSET
127	hex "Link address offset for booting"
128	default "0x00500000"
129	help
130	  This option allows you to set the link address offset of the zImage.
131	  This can be useful if you are on a board which has a small amount of
132	  memory.
133
134endmenu
135
136menu "Advanced setup"
137
138config ADVANCED_OPTIONS
139	bool "Prompt for advanced kernel configuration options"
140
141comment "Default settings for advanced configuration options are used"
142	depends on !ADVANCED_OPTIONS
143
144config NIOS2_KERNEL_MMU_REGION_BASE_BOOL
145	bool "Set custom kernel MMU region base address"
146	depends on ADVANCED_OPTIONS
147	help
148	  This option allows you to set the virtual address of the kernel MMU region.
149
150	  Say N here unless you know what you are doing.
151
152config NIOS2_KERNEL_MMU_REGION_BASE
153	hex "Virtual base address of the kernel MMU region " if NIOS2_KERNEL_MMU_REGION_BASE_BOOL
154	default "0x80000000"
155	help
156	  This option allows you to set the virtual base address of the kernel MMU region.
157
158config NIOS2_KERNEL_REGION_BASE_BOOL
159	bool "Set custom kernel region base address"
160	depends on ADVANCED_OPTIONS
161	help
162	  This option allows you to set the virtual address of the kernel region.
163
164	  Say N here unless you know what you are doing.
165
166config NIOS2_KERNEL_REGION_BASE
167	hex "Virtual base address of the kernel region " if NIOS2_KERNEL_REGION_BASE_BOOL
168	default "0xc0000000"
169
170config NIOS2_IO_REGION_BASE_BOOL
171	bool "Set custom I/O region base address"
172	depends on ADVANCED_OPTIONS
173	help
174	  This option allows you to set the virtual address of the I/O region.
175
176	  Say N here unless you know what you are doing.
177
178config NIOS2_IO_REGION_BASE
179	hex "Virtual base address of the I/O region" if NIOS2_IO_REGION_BASE_BOOL
180	default "0xe0000000"
181
182endmenu
183