xref: /openbmc/linux/arch/microblaze/Kconfig (revision a8f54d94) 
1# SPDX-License-Identifier: GPL-2.0-only
2config MICROBLAZE
3	def_bool y
4	select ARCH_32BIT_OFF_T
5	select ARCH_NO_SWAP
6	select ARCH_HAS_DMA_PREP_COHERENT
7	select ARCH_HAS_GCOV_PROFILE_ALL
8	select ARCH_HAS_SYNC_DMA_FOR_CPU
9	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
10	select ARCH_MIGHT_HAVE_PC_PARPORT
11	select ARCH_WANT_IPC_PARSE_VERSION
12	select BUILDTIME_TABLE_SORT
13	select TIMER_OF
14	select CLONE_BACKWARDS3
15	select COMMON_CLK
16	select DMA_DIRECT_REMAP
17	select GENERIC_ATOMIC64
18	select GENERIC_CPU_DEVICES
19	select GENERIC_IDLE_POLL_SETUP
20	select GENERIC_IRQ_PROBE
21	select GENERIC_IRQ_SHOW
22	select GENERIC_PCI_IOMAP
23	select GENERIC_SCHED_CLOCK
24	select HAVE_ARCH_HASH
25	select HAVE_ARCH_KGDB
26	select HAVE_ARCH_SECCOMP
27	select HAVE_DEBUG_KMEMLEAK
28	select HAVE_DMA_CONTIGUOUS
29	select HAVE_DYNAMIC_FTRACE
30	select HAVE_FTRACE_MCOUNT_RECORD
31	select HAVE_FUNCTION_GRAPH_TRACER
32	select HAVE_FUNCTION_TRACER
33	select HAVE_PCI
34	select IRQ_DOMAIN
35	select XILINX_INTC
36	select MODULES_USE_ELF_RELA
37	select OF
38	select OF_EARLY_FLATTREE
39	select PCI_DOMAINS_GENERIC if PCI
40	select PCI_SYSCALL if PCI
41	select CPU_NO_EFFICIENT_FFS
42	select MMU_GATHER_NO_RANGE
43	select SPARSE_IRQ
44	select ZONE_DMA
45	select TRACE_IRQFLAGS_SUPPORT
46	select GENERIC_IRQ_MULTI_HANDLER
47
48# Endianness selection
49choice
50	prompt "Endianness selection"
51	default CPU_LITTLE_ENDIAN
52	help
53	  microblaze architectures can be configured for either little or
54	  big endian formats. Be sure to select the appropriate mode.
55
56config CPU_BIG_ENDIAN
57	bool "Big endian"
58
59config CPU_LITTLE_ENDIAN
60	bool "Little endian"
61
62endchoice
63
64config ARCH_HAS_ILOG2_U32
65	def_bool n
66
67config ARCH_HAS_ILOG2_U64
68	def_bool n
69
70config GENERIC_HWEIGHT
71	def_bool y
72
73config GENERIC_CALIBRATE_DELAY
74	def_bool y
75
76config GENERIC_CSUM
77	def_bool y
78
79config STACKTRACE_SUPPORT
80	def_bool y
81
82config LOCKDEP_SUPPORT
83	def_bool y
84
85source "arch/microblaze/Kconfig.platform"
86
87menu "Processor type and features"
88
89source "kernel/Kconfig.hz"
90
91config MMU
92	def_bool y
93
94comment "Boot options"
95
96config CMDLINE_BOOL
97	bool "Default bootloader kernel arguments"
98
99config CMDLINE
100	string "Default kernel command string"
101	depends on CMDLINE_BOOL
102	default "console=ttyUL0,115200"
103	help
104	  On some architectures there is currently no way for the boot loader
105	  to pass arguments to the kernel. For these architectures, you should
106	  supply some command-line options at build time by entering them
107	  here.
108
109config CMDLINE_FORCE
110	bool "Force default kernel command string"
111	depends on CMDLINE_BOOL
112	default n
113	help
114	  Set this to have arguments from the default kernel command string
115	  override those passed by the boot loader.
116
117endmenu
118
119menu "Kernel features"
120
121config NR_CPUS
122	int
123	default "1"
124
125config ADVANCED_OPTIONS
126	bool "Prompt for advanced kernel configuration options"
127	help
128	  This option will enable prompting for a variety of advanced kernel
129	  configuration options.  These options can cause the kernel to not
130	  work if they are set incorrectly, but can be used to optimize certain
131	  aspects of kernel memory management.
132
133	  Unless you know what you are doing, say N here.
134
135comment "Default settings for advanced configuration options are used"
136	depends on !ADVANCED_OPTIONS
137
138config HIGHMEM
139	bool "High memory support"
140	select KMAP_LOCAL
141	help
142	  The address space of Microblaze processors is only 4 Gigabytes large
143	  and it has to accommodate user address space, kernel address
144	  space as well as some memory mapped IO. That means that, if you
145	  have a large amount of physical memory and/or IO, not all of the
146	  memory can be "permanently mapped" by the kernel. The physical
147	  memory that is not permanently mapped is called "high memory".
148
149	  If unsure, say n.
150
151config LOWMEM_SIZE_BOOL
152	bool "Set maximum low memory"
153	depends on ADVANCED_OPTIONS
154	help
155	  This option allows you to set the maximum amount of memory which
156	  will be used as "low memory", that is, memory which the kernel can
157	  access directly, without having to set up a kernel virtual mapping.
158	  This can be useful in optimizing the layout of kernel virtual
159	  memory.
160
161	  Say N here unless you know what you are doing.
162
163config LOWMEM_SIZE
164	hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
165	default "0x30000000"
166
167config MANUAL_RESET_VECTOR
168	hex "Microblaze reset vector address setup"
169	default "0x0"
170	help
171	  Set this option to have the kernel override the CPU Reset vector.
172	  If zero, no change will be made to the MicroBlaze reset vector at
173	  address 0x0.
174	  If non-zero, a jump instruction to this address, will be written
175	  to the reset vector at address 0x0.
176	  If you are unsure, set it to default value 0x0.
177
178config KERNEL_START_BOOL
179	bool "Set custom kernel base address"
180	depends on ADVANCED_OPTIONS
181	help
182	  This option allows you to set the kernel virtual address at which
183	  the kernel will map low memory (the kernel image will be linked at
184	  this address).  This can be useful in optimizing the virtual memory
185	  layout of the system.
186
187	  Say N here unless you know what you are doing.
188
189config KERNEL_START
190	hex "Virtual address of kernel base" if KERNEL_START_BOOL
191	default "0xc0000000"
192
193config TASK_SIZE_BOOL
194	bool "Set custom user task size"
195	depends on ADVANCED_OPTIONS
196	help
197	  This option allows you to set the amount of virtual address space
198	  allocated to user tasks.  This can be useful in optimizing the
199	  virtual memory layout of the system.
200
201	  Say N here unless you know what you are doing.
202
203config TASK_SIZE
204	hex "Size of user task space" if TASK_SIZE_BOOL
205	default "0x80000000"
206
207config MB_MANAGER
208	bool "Support for Microblaze Manager"
209	depends on ADVANCED_OPTIONS
210	help
211	  This option enables API for configuring the MicroBlaze manager
212	  control register, which is consumed by the break handler to
213	  block the break.
214
215	  Say N here unless you know what you are doing.
216
217endmenu
218