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_DEBUG_KMEMLEAK
30 select HAVE_DMA_CONTIGUOUS
31 select HAVE_DYNAMIC_FTRACE
32 select HAVE_FTRACE_MCOUNT_RECORD
33 select HAVE_FUNCTION_GRAPH_TRACER
34 select HAVE_FUNCTION_TRACER
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
50 # Endianness selection
52 prompt "Endianness selection"
53 default CPU_LITTLE_ENDIAN
55 microblaze architectures can be configured for either little or
56 big endian formats. Be sure to select the appropriate mode.
61 config CPU_LITTLE_ENDIAN
69 config ARCH_HAS_ILOG2_U32
72 config ARCH_HAS_ILOG2_U64
75 config GENERIC_HWEIGHT
78 config GENERIC_CALIBRATE_DELAY
84 config STACKTRACE_SUPPORT
87 config LOCKDEP_SUPPORT
90 source "arch/microblaze/Kconfig.platform"
92 menu "Processor type and features"
94 source "kernel/Kconfig.hz"
100 comment "Boot options"
103 bool "Default bootloader kernel arguments"
106 string "Default kernel command string"
107 depends on CMDLINE_BOOL
108 default "console=ttyUL0,115200"
110 On some architectures there is currently no way for the boot loader
111 to pass arguments to the kernel. For these architectures, you should
112 supply some command-line options at build time by entering them
116 bool "Force default kernel command string"
117 depends on CMDLINE_BOOL
120 Set this to have arguments from the default kernel command string
121 override those passed by the boot loader.
124 bool "Enable seccomp to safely compute untrusted bytecode"
128 This kernel feature is useful for number crunching applications
129 that may need to compute untrusted bytecode during their
130 execution. By using pipes or other transports made available to
131 the process as file descriptors supporting the read/write
132 syscalls, it's possible to isolate those applications in
133 their own address space using seccomp. Once seccomp is
134 enabled via /proc/<pid>/seccomp, it cannot be disabled
135 and the task is only allowed to execute a few safe syscalls
136 defined by each seccomp mode.
138 If unsure, say Y. Only embedded should say N here.
142 menu "Kernel features"
148 config ADVANCED_OPTIONS
149 bool "Prompt for advanced kernel configuration options"
151 This option will enable prompting for a variety of advanced kernel
152 configuration options. These options can cause the kernel to not
153 work if they are set incorrectly, but can be used to optimize certain
154 aspects of kernel memory management.
156 Unless you know what you are doing, say N here.
158 comment "Default settings for advanced configuration options are used"
159 depends on !ADVANCED_OPTIONS
161 config XILINX_UNCACHED_SHADOW
162 bool "Are you using uncached shadow for RAM ?"
163 depends on ADVANCED_OPTIONS && !MMU
166 This is needed to be able to allocate uncachable memory regions.
167 The feature requires the design to define the RAM memory controller
168 window to be twice as large as the actual physical memory.
171 bool "High memory support"
174 The address space of Microblaze processors is only 4 Gigabytes large
175 and it has to accommodate user address space, kernel address
176 space as well as some memory mapped IO. That means that, if you
177 have a large amount of physical memory and/or IO, not all of the
178 memory can be "permanently mapped" by the kernel. The physical
179 memory that is not permanently mapped is called "high memory".
183 config LOWMEM_SIZE_BOOL
184 bool "Set maximum low memory"
185 depends on ADVANCED_OPTIONS && MMU
187 This option allows you to set the maximum amount of memory which
188 will be used as "low memory", that is, memory which the kernel can
189 access directly, without having to set up a kernel virtual mapping.
190 This can be useful in optimizing the layout of kernel virtual
193 Say N here unless you know what you are doing.
196 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
199 config MANUAL_RESET_VECTOR
200 hex "Microblaze reset vector address setup"
203 Set this option to have the kernel override the CPU Reset vector.
204 If zero, no change will be made to the MicroBlaze reset vector at
206 If non-zero, a jump instruction to this address, will be written
207 to the reset vector at address 0x0.
208 If you are unsure, set it to default value 0x0.
210 config KERNEL_START_BOOL
211 bool "Set custom kernel base address"
212 depends on ADVANCED_OPTIONS
214 This option allows you to set the kernel virtual address at which
215 the kernel will map low memory (the kernel image will be linked at
216 this address). This can be useful in optimizing the virtual memory
217 layout of the system.
219 Say N here unless you know what you are doing.
222 hex "Virtual address of kernel base" if KERNEL_START_BOOL
223 default "0xc0000000" if MMU
224 default KERNEL_BASE_ADDR if !MMU
226 config TASK_SIZE_BOOL
227 bool "Set custom user task size"
228 depends on ADVANCED_OPTIONS && MMU
230 This option allows you to set the amount of virtual address space
231 allocated to user tasks. This can be useful in optimizing the
232 virtual memory layout of the system.
234 Say N here unless you know what you are doing.
237 hex "Size of user task space" if TASK_SIZE_BOOL
242 default MICROBLAZE_4K_PAGES
243 depends on ADVANCED_OPTIONS && !MMU
245 Select the kernel logical page size. Increasing the page size
246 will reduce software overhead at each page boundary, allow
247 hardware prefetch mechanisms to be more effective, and allow
248 larger dma transfers increasing IO efficiency and reducing
249 overhead. However the utilization of memory will increase.
250 For example, each cached file will using a multiple of the
251 page size to hold its contents and the difference between the
252 end of file and the end of page is wasted.
254 If unsure, choose 4K_PAGES.
256 config MICROBLAZE_4K_PAGES
259 config MICROBLAZE_16K_PAGES
262 config MICROBLAZE_64K_PAGES
272 bool "Xilinx PCI host bridge support"