xref: /openbmc/linux/arch/nios2/Kconfig (revision 95777591) 
1# SPDX-License-Identifier: GPL-2.0
2config NIOS2
3	def_bool y
4	select ARCH_32BIT_OFF_T
5	select ARCH_HAS_SYNC_DMA_FOR_CPU
6	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
7	select ARCH_NO_SWAP
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 FPU
41	def_bool n
42
43config RWSEM_GENERIC_SPINLOCK
44	def_bool y
45
46config TRACE_IRQFLAGS_SUPPORT
47	def_bool n
48
49menu "Kernel features"
50
51source "kernel/Kconfig.hz"
52
53config FORCE_MAX_ZONEORDER
54	int "Maximum zone order"
55	range 9 20
56	default "11"
57	help
58	  The kernel memory allocator divides physically contiguous memory
59	  blocks into "zones", where each zone is a power of two number of
60	  pages.  This option selects the largest power of two that the kernel
61	  keeps in the memory allocator.  If you need to allocate very large
62	  blocks of physically contiguous memory, then you may need to
63	  increase this value.
64
65	  This config option is actually maximum order plus one. For example,
66	  a value of 11 means that the largest free memory block is 2^10 pages.
67
68endmenu
69
70source "arch/nios2/platform/Kconfig.platform"
71
72menu "Processor type and features"
73
74config MMU
75	def_bool y
76
77config NR_CPUS
78	int
79	default "1"
80
81config NIOS2_ALIGNMENT_TRAP
82	bool "Catch alignment trap"
83	default y
84	help
85	  Nios II CPUs cannot fetch/store data which is not bus aligned,
86	  i.e., a 2 or 4 byte fetch must start at an address divisible by
87	  2 or 4. Any non-aligned load/store instructions will be trapped and
88	  emulated in software if you say Y here, which has a performance
89	  impact.
90
91comment "Boot options"
92
93config CMDLINE_BOOL
94	bool "Default bootloader kernel arguments"
95	default y
96
97config CMDLINE
98	string "Default kernel command string"
99	default ""
100	depends on CMDLINE_BOOL
101	help
102	  On some platforms, there is currently no way for the boot loader to
103	  pass arguments to the kernel. For these platforms, you can supply
104	  some command-line options at build time by entering them here.  In
105	  other cases you can specify kernel args so that you don't have
106	  to set them up in board prom initialization routines.
107
108config CMDLINE_FORCE
109	bool "Force default kernel command string"
110	depends on CMDLINE_BOOL
111	help
112	  Set this to have arguments from the default kernel command string
113	  override those passed by the boot loader.
114
115config NIOS2_CMDLINE_IGNORE_DTB
116	bool "Ignore kernel command string from DTB"
117	depends on CMDLINE_BOOL
118	depends on !CMDLINE_FORCE
119	default y
120	help
121	  Set this to ignore the bootargs property from the devicetree's
122	  chosen node and fall back to CMDLINE if nothing is passed.
123
124config NIOS2_PASS_CMDLINE
125	bool "Passed kernel command line from u-boot"
126	default n
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