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
51 # Endianness selection
53 prompt "Endianness selection"
54 default CPU_LITTLE_ENDIAN
56 microblaze architectures can be configured for either little or
57 big endian formats. Be sure to select the appropriate mode.
62 config CPU_LITTLE_ENDIAN
70 config ARCH_HAS_ILOG2_U32
73 config ARCH_HAS_ILOG2_U64
76 config GENERIC_HWEIGHT
79 config GENERIC_CALIBRATE_DELAY
85 config STACKTRACE_SUPPORT
88 config LOCKDEP_SUPPORT
91 source "arch/microblaze/Kconfig.platform"
93 menu "Processor type and features"
95 source "kernel/Kconfig.hz"
101 comment "Boot options"
104 bool "Default bootloader kernel arguments"
107 string "Default kernel command string"
108 depends on CMDLINE_BOOL
109 default "console=ttyUL0,115200"
111 On some architectures there is currently no way for the boot loader
112 to pass arguments to the kernel. For these architectures, you should
113 supply some command-line options at build time by entering them
117 bool "Force default kernel command string"
118 depends on CMDLINE_BOOL
121 Set this to have arguments from the default kernel command string
122 override those passed by the boot loader.
126 menu "Kernel features"
132 config ADVANCED_OPTIONS
133 bool "Prompt for advanced kernel configuration options"
135 This option will enable prompting for a variety of advanced kernel
136 configuration options. These options can cause the kernel to not
137 work if they are set incorrectly, but can be used to optimize certain
138 aspects of kernel memory management.
140 Unless you know what you are doing, say N here.
142 comment "Default settings for advanced configuration options are used"
143 depends on !ADVANCED_OPTIONS
145 config XILINX_UNCACHED_SHADOW
146 bool "Are you using uncached shadow for RAM ?"
147 depends on ADVANCED_OPTIONS && !MMU
150 This is needed to be able to allocate uncachable memory regions.
151 The feature requires the design to define the RAM memory controller
152 window to be twice as large as the actual physical memory.
155 bool "High memory support"
158 The address space of Microblaze processors is only 4 Gigabytes large
159 and it has to accommodate user address space, kernel address
160 space as well as some memory mapped IO. That means that, if you
161 have a large amount of physical memory and/or IO, not all of the
162 memory can be "permanently mapped" by the kernel. The physical
163 memory that is not permanently mapped is called "high memory".
167 config LOWMEM_SIZE_BOOL
168 bool "Set maximum low memory"
169 depends on ADVANCED_OPTIONS && MMU
171 This option allows you to set the maximum amount of memory which
172 will be used as "low memory", that is, memory which the kernel can
173 access directly, without having to set up a kernel virtual mapping.
174 This can be useful in optimizing the layout of kernel virtual
177 Say N here unless you know what you are doing.
180 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
183 config MANUAL_RESET_VECTOR
184 hex "Microblaze reset vector address setup"
187 Set this option to have the kernel override the CPU Reset vector.
188 If zero, no change will be made to the MicroBlaze reset vector at
190 If non-zero, a jump instruction to this address, will be written
191 to the reset vector at address 0x0.
192 If you are unsure, set it to default value 0x0.
194 config KERNEL_START_BOOL
195 bool "Set custom kernel base address"
196 depends on ADVANCED_OPTIONS
198 This option allows you to set the kernel virtual address at which
199 the kernel will map low memory (the kernel image will be linked at
200 this address). This can be useful in optimizing the virtual memory
201 layout of the system.
203 Say N here unless you know what you are doing.
206 hex "Virtual address of kernel base" if KERNEL_START_BOOL
207 default "0xc0000000" if MMU
208 default KERNEL_BASE_ADDR if !MMU
210 config TASK_SIZE_BOOL
211 bool "Set custom user task size"
212 depends on ADVANCED_OPTIONS && MMU
214 This option allows you to set the amount of virtual address space
215 allocated to user tasks. This can be useful in optimizing the
216 virtual memory layout of the system.
218 Say N here unless you know what you are doing.
221 hex "Size of user task space" if TASK_SIZE_BOOL
226 default MICROBLAZE_4K_PAGES
227 depends on ADVANCED_OPTIONS && !MMU
229 Select the kernel logical page size. Increasing the page size
230 will reduce software overhead at each page boundary, allow
231 hardware prefetch mechanisms to be more effective, and allow
232 larger dma transfers increasing IO efficiency and reducing
233 overhead. However the utilization of memory will increase.
234 For example, each cached file will using a multiple of the
235 page size to hold its contents and the difference between the
236 end of file and the end of page is wasted.
238 If unsure, choose 4K_PAGES.
240 config MICROBLAZE_4K_PAGES
243 config MICROBLAZE_16K_PAGES
246 config MICROBLAZE_64K_PAGES
256 bool "Xilinx PCI host bridge support"