xref: /openbmc/linux/arch/nios2/Kconfig (revision 8a5aaf97) 
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 TIMER_OF
8	select GENERIC_ATOMIC64
9	select GENERIC_CLOCKEVENTS
10	select GENERIC_CPU_DEVICES
11	select GENERIC_IRQ_PROBE
12	select GENERIC_IRQ_SHOW
13	select GENERIC_STRNCPY_FROM_USER
14	select GENERIC_STRNLEN_USER
15	select HAVE_ARCH_TRACEHOOK
16	select HAVE_ARCH_KGDB
17	select IRQ_DOMAIN
18	select MODULES_USE_ELF_RELA
19	select OF
20	select OF_EARLY_FLATTREE
21	select SOC_BUS
22	select SPARSE_IRQ
23	select USB_ARCH_HAS_HCD if USB_SUPPORT
24	select CPU_NO_EFFICIENT_FFS
25	select ARCH_DISCARD_MEMBLOCK
26
27config GENERIC_CSUM
28	def_bool y
29
30config GENERIC_HWEIGHT
31	def_bool y
32
33config GENERIC_CALIBRATE_DELAY
34	def_bool y
35
36config NO_IOPORT_MAP
37	def_bool y
38
39config FPU
40	def_bool n
41
42config RWSEM_GENERIC_SPINLOCK
43	def_bool y
44
45config TRACE_IRQFLAGS_SUPPORT
46	def_bool n
47
48menu "Kernel features"
49
50source "kernel/Kconfig.hz"
51
52config FORCE_MAX_ZONEORDER
53	int "Maximum zone order"
54	range 9 20
55	default "11"
56	help
57	  The kernel memory allocator divides physically contiguous memory
58	  blocks into "zones", where each zone is a power of two number of
59	  pages.  This option selects the largest power of two that the kernel
60	  keeps in the memory allocator.  If you need to allocate very large
61	  blocks of physically contiguous memory, then you may need to
62	  increase this value.
63
64	  This config option is actually maximum order plus one. For example,
65	  a value of 11 means that the largest free memory block is 2^10 pages.
66
67endmenu
68
69source "arch/nios2/platform/Kconfig.platform"
70
71menu "Processor type and features"
72
73config MMU
74	def_bool y
75
76config NR_CPUS
77	int
78	default "1"
79
80config NIOS2_ALIGNMENT_TRAP
81	bool "Catch alignment trap"
82	default y
83	help
84	  Nios II CPUs cannot fetch/store data which is not bus aligned,
85	  i.e., a 2 or 4 byte fetch must start at an address divisible by
86	  2 or 4. Any non-aligned load/store instructions will be trapped and
87	  emulated in software if you say Y here, which has a performance
88	  impact.
89
90comment "Boot options"
91
92config CMDLINE_BOOL
93	bool "Default bootloader kernel arguments"
94	default y
95
96config CMDLINE
97	string "Default kernel command string"
98	default ""
99	depends on CMDLINE_BOOL
100	help
101	  On some platforms, there is currently no way for the boot loader to
102	  pass arguments to the kernel. For these platforms, you can supply
103	  some command-line options at build time by entering them here.  In
104	  other cases you can specify kernel args so that you don't have
105	  to set them up in board prom initialization routines.
106
107config CMDLINE_FORCE
108	bool "Force default kernel command string"
109	depends on CMDLINE_BOOL
110	help
111	  Set this to have arguments from the default kernel command string
112	  override those passed by the boot loader.
113
114config NIOS2_CMDLINE_IGNORE_DTB
115	bool "Ignore kernel command string from DTB"
116	depends on CMDLINE_BOOL
117	depends on !CMDLINE_FORCE
118	default y
119	help
120	  Set this to ignore the bootargs property from the devicetree's
121	  chosen node and fall back to CMDLINE if nothing is passed.
122
123config NIOS2_PASS_CMDLINE
124	bool "Passed kernel command line from u-boot"
125	default n
126	help
127	  Use bootargs env variable from u-boot for kernel command line.
128	  will override "Default kernel command string".
129	  Say N if you are unsure.
130
131config NIOS2_BOOT_LINK_OFFSET
132	hex "Link address offset for booting"
133	default "0x00500000"
134	help
135	  This option allows you to set the link address offset of the zImage.
136	  This can be useful if you are on a board which has a small amount of
137	  memory.
138
139endmenu
140
141menu "Advanced setup"
142
143config ADVANCED_OPTIONS
144	bool "Prompt for advanced kernel configuration options"
145
146comment "Default settings for advanced configuration options are used"
147	depends on !ADVANCED_OPTIONS
148
149config NIOS2_KERNEL_MMU_REGION_BASE_BOOL
150	bool "Set custom kernel MMU region base address"
151	depends on ADVANCED_OPTIONS
152	help
153	  This option allows you to set the virtual address of the kernel MMU region.
154
155	  Say N here unless you know what you are doing.
156
157config NIOS2_KERNEL_MMU_REGION_BASE
158	hex "Virtual base address of the kernel MMU region " if NIOS2_KERNEL_MMU_REGION_BASE_BOOL
159	default "0x80000000"
160	help
161	  This option allows you to set the virtual base address of the kernel MMU region.
162
163config NIOS2_KERNEL_REGION_BASE_BOOL
164	bool "Set custom kernel region base address"
165	depends on ADVANCED_OPTIONS
166	help
167	  This option allows you to set the virtual address of the kernel region.
168
169	  Say N here unless you know what you are doing.
170
171config NIOS2_KERNEL_REGION_BASE
172	hex "Virtual base address of the kernel region " if NIOS2_KERNEL_REGION_BASE_BOOL
173	default "0xc0000000"
174
175config NIOS2_IO_REGION_BASE_BOOL
176	bool "Set custom I/O region base address"
177	depends on ADVANCED_OPTIONS
178	help
179	  This option allows you to set the virtual address of the I/O region.
180
181	  Say N here unless you know what you are doing.
182
183config NIOS2_IO_REGION_BASE
184	hex "Virtual base address of the I/O region" if NIOS2_IO_REGION_BASE_BOOL
185	default "0xe0000000"
186
187endmenu
188