xref: /openbmc/linux/arch/nios2/Kconfig (revision ff62b8e6) 
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
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
43menu "Kernel features"
44
45source "kernel/Kconfig.hz"
46
47config ARCH_FORCE_MAX_ORDER
48	int "Maximum zone order"
49	range 9 20
50	default "11"
51	help
52	  The kernel memory allocator divides physically contiguous memory
53	  blocks into "zones", where each zone is a power of two number of
54	  pages.  This option selects the largest power of two that the kernel
55	  keeps in the memory allocator.  If you need to allocate very large
56	  blocks of physically contiguous memory, then you may need to
57	  increase this value.
58
59	  This config option is actually maximum order plus one. For example,
60	  a value of 11 means that the largest free memory block is 2^10 pages.
61
62endmenu
63
64source "arch/nios2/platform/Kconfig.platform"
65
66menu "Processor type and features"
67
68config MMU
69	def_bool y
70
71config NR_CPUS
72	int
73	default "1"
74
75config NIOS2_ALIGNMENT_TRAP
76	bool "Catch alignment trap"
77	default y
78	help
79	  Nios II CPUs cannot fetch/store data which is not bus aligned,
80	  i.e., a 2 or 4 byte fetch must start at an address divisible by
81	  2 or 4. Any non-aligned load/store instructions will be trapped and
82	  emulated in software if you say Y here, which has a performance
83	  impact.
84
85comment "Boot options"
86
87config CMDLINE_BOOL
88	bool "Default bootloader kernel arguments"
89	default y
90
91config CMDLINE
92	string "Default kernel command string"
93	default ""
94	depends on CMDLINE_BOOL
95	help
96	  On some platforms, there is currently no way for the boot loader to
97	  pass arguments to the kernel. For these platforms, you can supply
98	  some command-line options at build time by entering them here.  In
99	  other cases you can specify kernel args so that you don't have
100	  to set them up in board prom initialization routines.
101
102config CMDLINE_FORCE
103	bool "Force default kernel command string"
104	depends on CMDLINE_BOOL
105	help
106	  Set this to have arguments from the default kernel command string
107	  override those passed by the boot loader.
108
109config NIOS2_CMDLINE_IGNORE_DTB
110	bool "Ignore kernel command string from DTB"
111	depends on CMDLINE_BOOL
112	depends on !CMDLINE_FORCE
113	default y
114	help
115	  Set this to ignore the bootargs property from the devicetree's
116	  chosen node and fall back to CMDLINE if nothing is passed.
117
118config NIOS2_PASS_CMDLINE
119	bool "Passed kernel command line from u-boot"
120	help
121	  Use bootargs env variable from u-boot for kernel command line.
122	  will override "Default kernel command string".
123	  Say N if you are unsure.
124
125config NIOS2_BOOT_LINK_OFFSET
126	hex "Link address offset for booting"
127	default "0x00500000"
128	help
129	  This option allows you to set the link address offset of the zImage.
130	  This can be useful if you are on a board which has a small amount of
131	  memory.
132
133endmenu
134
135menu "Advanced setup"
136
137config ADVANCED_OPTIONS
138	bool "Prompt for advanced kernel configuration options"
139
140comment "Default settings for advanced configuration options are used"
141	depends on !ADVANCED_OPTIONS
142
143config NIOS2_KERNEL_MMU_REGION_BASE_BOOL
144	bool "Set custom kernel MMU region base address"
145	depends on ADVANCED_OPTIONS
146	help
147	  This option allows you to set the virtual address of the kernel MMU region.
148
149	  Say N here unless you know what you are doing.
150
151config NIOS2_KERNEL_MMU_REGION_BASE
152	hex "Virtual base address of the kernel MMU region " if NIOS2_KERNEL_MMU_REGION_BASE_BOOL
153	default "0x80000000"
154	help
155	  This option allows you to set the virtual base address of the kernel MMU region.
156
157config NIOS2_KERNEL_REGION_BASE_BOOL
158	bool "Set custom kernel region base address"
159	depends on ADVANCED_OPTIONS
160	help
161	  This option allows you to set the virtual address of the kernel region.
162
163	  Say N here unless you know what you are doing.
164
165config NIOS2_KERNEL_REGION_BASE
166	hex "Virtual base address of the kernel region " if NIOS2_KERNEL_REGION_BASE_BOOL
167	default "0xc0000000"
168
169config NIOS2_IO_REGION_BASE_BOOL
170	bool "Set custom I/O region base address"
171	depends on ADVANCED_OPTIONS
172	help
173	  This option allows you to set the virtual address of the I/O region.
174
175	  Say N here unless you know what you are doing.
176
177config NIOS2_IO_REGION_BASE
178	hex "Virtual base address of the I/O region" if NIOS2_IO_REGION_BASE_BOOL
179	default "0xe0000000"
180
181endmenu
182