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_UNCACHED_SEGMENT if !MMU
12 select ARCH_MIGHT_HAVE_PC_PARPORT
13 select ARCH_WANT_IPC_PARSE_VERSION
14 select BUILDTIME_EXTABLE_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_DEBUG_KMEMLEAK
30 select HAVE_DYNAMIC_FTRACE
31 select HAVE_FTRACE_MCOUNT_RECORD
32 select HAVE_FUNCTION_GRAPH_TRACER
33 select HAVE_FUNCTION_TRACER
34 select HAVE_MEMBLOCK_NODE_MAP
39 select MODULES_USE_ELF_RELA
41 select OF_EARLY_FLATTREE
42 select PCI_DOMAINS_GENERIC if PCI
43 select PCI_SYSCALL if PCI
44 select TRACING_SUPPORT
46 select CPU_NO_EFFICIENT_FFS
47 select MMU_GATHER_NO_RANGE if MMU
49 # Endianness selection
51 prompt "Endianness selection"
52 default CPU_LITTLE_ENDIAN
54 microblaze architectures can be configured for either little or
55 big endian formats. Be sure to select the appropriate mode.
60 config CPU_LITTLE_ENDIAN
68 config ARCH_HAS_ILOG2_U32
71 config ARCH_HAS_ILOG2_U64
74 config GENERIC_HWEIGHT
77 config GENERIC_CALIBRATE_DELAY
83 config STACKTRACE_SUPPORT
86 config LOCKDEP_SUPPORT
89 source "arch/microblaze/Kconfig.platform"
91 menu "Processor type and features"
93 source "kernel/Kconfig.hz"
99 comment "Boot options"
102 bool "Default bootloader kernel arguments"
105 string "Default kernel command string"
106 depends on CMDLINE_BOOL
107 default "console=ttyUL0,115200"
109 On some architectures there is currently no way for the boot loader
110 to pass arguments to the kernel. For these architectures, you should
111 supply some command-line options at build time by entering them
115 bool "Force default kernel command string"
116 depends on CMDLINE_BOOL
119 Set this to have arguments from the default kernel command string
120 override those passed by the boot loader.
123 bool "Enable seccomp to safely compute untrusted bytecode"
127 This kernel feature is useful for number crunching applications
128 that may need to compute untrusted bytecode during their
129 execution. By using pipes or other transports made available to
130 the process as file descriptors supporting the read/write
131 syscalls, it's possible to isolate those applications in
132 their own address space using seccomp. Once seccomp is
133 enabled via /proc/<pid>/seccomp, it cannot be disabled
134 and the task is only allowed to execute a few safe syscalls
135 defined by each seccomp mode.
137 If unsure, say Y. Only embedded should say N here.
141 menu "Kernel features"
147 config ADVANCED_OPTIONS
148 bool "Prompt for advanced kernel configuration options"
150 This option will enable prompting for a variety of advanced kernel
151 configuration options. These options can cause the kernel to not
152 work if they are set incorrectly, but can be used to optimize certain
153 aspects of kernel memory management.
155 Unless you know what you are doing, say N here.
157 comment "Default settings for advanced configuration options are used"
158 depends on !ADVANCED_OPTIONS
160 config XILINX_UNCACHED_SHADOW
161 bool "Are you using uncached shadow for RAM ?"
162 depends on ADVANCED_OPTIONS && !MMU
165 This is needed to be able to allocate uncachable memory regions.
166 The feature requires the design to define the RAM memory controller
167 window to be twice as large as the actual physical memory.
170 bool "High memory support"
173 The address space of Microblaze processors is only 4 Gigabytes large
174 and it has to accommodate user address space, kernel address
175 space as well as some memory mapped IO. That means that, if you
176 have a large amount of physical memory and/or IO, not all of the
177 memory can be "permanently mapped" by the kernel. The physical
178 memory that is not permanently mapped is called "high memory".
182 config LOWMEM_SIZE_BOOL
183 bool "Set maximum low memory"
184 depends on ADVANCED_OPTIONS && MMU
186 This option allows you to set the maximum amount of memory which
187 will be used as "low memory", that is, memory which the kernel can
188 access directly, without having to set up a kernel virtual mapping.
189 This can be useful in optimizing the layout of kernel virtual
192 Say N here unless you know what you are doing.
195 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
198 config MANUAL_RESET_VECTOR
199 hex "Microblaze reset vector address setup"
202 Set this option to have the kernel override the CPU Reset vector.
203 If zero, no change will be made to the MicroBlaze reset vector at
205 If non-zero, a jump instruction to this address, will be written
206 to the reset vector at address 0x0.
207 If you are unsure, set it to default value 0x0.
209 config KERNEL_START_BOOL
210 bool "Set custom kernel base address"
211 depends on ADVANCED_OPTIONS
213 This option allows you to set the kernel virtual address at which
214 the kernel will map low memory (the kernel image will be linked at
215 this address). This can be useful in optimizing the virtual memory
216 layout of the system.
218 Say N here unless you know what you are doing.
221 hex "Virtual address of kernel base" if KERNEL_START_BOOL
222 default "0xc0000000" if MMU
223 default KERNEL_BASE_ADDR if !MMU
225 config TASK_SIZE_BOOL
226 bool "Set custom user task size"
227 depends on ADVANCED_OPTIONS && MMU
229 This option allows you to set the amount of virtual address space
230 allocated to user tasks. This can be useful in optimizing the
231 virtual memory layout of the system.
233 Say N here unless you know what you are doing.
236 hex "Size of user task space" if TASK_SIZE_BOOL
241 default MICROBLAZE_4K_PAGES
242 depends on ADVANCED_OPTIONS && !MMU
244 Select the kernel logical page size. Increasing the page size
245 will reduce software overhead at each page boundary, allow
246 hardware prefetch mechanisms to be more effective, and allow
247 larger dma transfers increasing IO efficiency and reducing
248 overhead. However the utilization of memory will increase.
249 For example, each cached file will using a multiple of the
250 page size to hold its contents and the difference between the
251 end of file and the end of page is wasted.
253 If unsure, choose 4K_PAGES.
255 config MICROBLAZE_4K_PAGES
258 config MICROBLAZE_16K_PAGES
261 config MICROBLAZE_64K_PAGES
271 bool "Xilinx PCI host bridge support"