1 # SPDX-License-Identifier: GPL-2.0-only
4 select ARCH_32BIT_OFF_T
6 select ARCH_HAS_BINFMT_FLAT if !MMU
7 select ARCH_HAS_DMA_PREP_COHERENT
8 select ARCH_HAS_GCOV_PROFILE_ALL
9 select ARCH_HAS_SYNC_DMA_FOR_CPU
10 select ARCH_HAS_SYNC_DMA_FOR_DEVICE
11 select ARCH_HAS_DMA_SET_UNCACHED if !MMU
12 select ARCH_MIGHT_HAVE_PC_PARPORT
13 select ARCH_WANT_IPC_PARSE_VERSION
14 select BUILDTIME_TABLE_SORT
16 select CLONE_BACKWARDS3
18 select DMA_DIRECT_REMAP if MMU
19 select GENERIC_ATOMIC64
20 select GENERIC_CLOCKEVENTS
21 select GENERIC_CPU_DEVICES
22 select GENERIC_IDLE_POLL_SETUP
23 select GENERIC_IRQ_PROBE
24 select GENERIC_IRQ_SHOW
25 select GENERIC_PCI_IOMAP
26 select GENERIC_SCHED_CLOCK
29 select HAVE_ARCH_SECCOMP
30 select HAVE_DEBUG_KMEMLEAK
31 select HAVE_DMA_CONTIGUOUS
32 select HAVE_DYNAMIC_FTRACE
33 select HAVE_FTRACE_MCOUNT_RECORD
34 select HAVE_FUNCTION_GRAPH_TRACER
35 select HAVE_FUNCTION_TRACER
40 select MODULES_USE_ELF_RELA
42 select OF_EARLY_FLATTREE
43 select PCI_DOMAINS_GENERIC if PCI
44 select PCI_SYSCALL if PCI
45 select TRACING_SUPPORT
47 select CPU_NO_EFFICIENT_FFS
48 select MMU_GATHER_NO_RANGE if MMU
52 # Endianness selection
54 prompt "Endianness selection"
55 default CPU_LITTLE_ENDIAN
57 microblaze architectures can be configured for either little or
58 big endian formats. Be sure to select the appropriate mode.
63 config CPU_LITTLE_ENDIAN
71 config ARCH_HAS_ILOG2_U32
74 config ARCH_HAS_ILOG2_U64
77 config GENERIC_HWEIGHT
80 config GENERIC_CALIBRATE_DELAY
86 config STACKTRACE_SUPPORT
89 config LOCKDEP_SUPPORT
92 source "arch/microblaze/Kconfig.platform"
94 menu "Processor type and features"
96 source "kernel/Kconfig.hz"
102 comment "Boot options"
105 bool "Default bootloader kernel arguments"
108 string "Default kernel command string"
109 depends on CMDLINE_BOOL
110 default "console=ttyUL0,115200"
112 On some architectures there is currently no way for the boot loader
113 to pass arguments to the kernel. For these architectures, you should
114 supply some command-line options at build time by entering them
118 bool "Force default kernel command string"
119 depends on CMDLINE_BOOL
122 Set this to have arguments from the default kernel command string
123 override those passed by the boot loader.
127 menu "Kernel features"
133 config ADVANCED_OPTIONS
134 bool "Prompt for advanced kernel configuration options"
136 This option will enable prompting for a variety of advanced kernel
137 configuration options. These options can cause the kernel to not
138 work if they are set incorrectly, but can be used to optimize certain
139 aspects of kernel memory management.
141 Unless you know what you are doing, say N here.
143 comment "Default settings for advanced configuration options are used"
144 depends on !ADVANCED_OPTIONS
146 config XILINX_UNCACHED_SHADOW
147 bool "Are you using uncached shadow for RAM ?"
148 depends on ADVANCED_OPTIONS && !MMU
151 This is needed to be able to allocate uncachable memory regions.
152 The feature requires the design to define the RAM memory controller
153 window to be twice as large as the actual physical memory.
156 bool "High memory support"
159 The address space of Microblaze processors is only 4 Gigabytes large
160 and it has to accommodate user address space, kernel address
161 space as well as some memory mapped IO. That means that, if you
162 have a large amount of physical memory and/or IO, not all of the
163 memory can be "permanently mapped" by the kernel. The physical
164 memory that is not permanently mapped is called "high memory".
168 config LOWMEM_SIZE_BOOL
169 bool "Set maximum low memory"
170 depends on ADVANCED_OPTIONS && MMU
172 This option allows you to set the maximum amount of memory which
173 will be used as "low memory", that is, memory which the kernel can
174 access directly, without having to set up a kernel virtual mapping.
175 This can be useful in optimizing the layout of kernel virtual
178 Say N here unless you know what you are doing.
181 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
184 config MANUAL_RESET_VECTOR
185 hex "Microblaze reset vector address setup"
188 Set this option to have the kernel override the CPU Reset vector.
189 If zero, no change will be made to the MicroBlaze reset vector at
191 If non-zero, a jump instruction to this address, will be written
192 to the reset vector at address 0x0.
193 If you are unsure, set it to default value 0x0.
195 config KERNEL_START_BOOL
196 bool "Set custom kernel base address"
197 depends on ADVANCED_OPTIONS
199 This option allows you to set the kernel virtual address at which
200 the kernel will map low memory (the kernel image will be linked at
201 this address). This can be useful in optimizing the virtual memory
202 layout of the system.
204 Say N here unless you know what you are doing.
207 hex "Virtual address of kernel base" if KERNEL_START_BOOL
208 default "0xc0000000" if MMU
209 default KERNEL_BASE_ADDR if !MMU
211 config TASK_SIZE_BOOL
212 bool "Set custom user task size"
213 depends on ADVANCED_OPTIONS && MMU
215 This option allows you to set the amount of virtual address space
216 allocated to user tasks. This can be useful in optimizing the
217 virtual memory layout of the system.
219 Say N here unless you know what you are doing.
222 hex "Size of user task space" if TASK_SIZE_BOOL
227 default MICROBLAZE_4K_PAGES
228 depends on ADVANCED_OPTIONS && !MMU
230 Select the kernel logical page size. Increasing the page size
231 will reduce software overhead at each page boundary, allow
232 hardware prefetch mechanisms to be more effective, and allow
233 larger dma transfers increasing IO efficiency and reducing
234 overhead. However the utilization of memory will increase.
235 For example, each cached file will using a multiple of the
236 page size to hold its contents and the difference between the
237 end of file and the end of page is wasted.
239 If unsure, choose 4K_PAGES.
241 config MICROBLAZE_4K_PAGES
244 config MICROBLAZE_16K_PAGES
247 config MICROBLAZE_64K_PAGES
257 bool "Xilinx PCI host bridge support"