1 # SPDX-License-Identifier: GPL-2.0
3 # For a description of the syntax of this configuration file,
4 # see Documentation/kbuild/kconfig-language.rst.
9 select ARCH_32BIT_OFF_T
10 select ARCH_HAS_DMA_SET_UNCACHED
11 select ARCH_HAS_DMA_CLEAR_UNCACHED
12 select ARCH_HAS_SYNC_DMA_FOR_DEVICE
15 select OF_EARLY_FLATTREE
18 select HAVE_ARCH_TRACEHOOK
20 select GENERIC_IRQ_CHIP
21 select GENERIC_IRQ_PROBE
22 select GENERIC_IRQ_SHOW
23 select GENERIC_PCI_IOMAP
24 select GENERIC_IOREMAP
25 select GENERIC_CPU_DEVICES
28 select HAVE_PAGE_SIZE_8KB
29 select GENERIC_ATOMIC64
30 select GENERIC_CLOCKEVENTS_BROADCAST
31 select GENERIC_SMP_IDLE_THREAD
32 select MODULES_USE_ELF_RELA
33 select HAVE_DEBUG_STACKOVERFLOW
35 select CPU_NO_EFFICIENT_FFS if !OPENRISC_HAVE_INST_FF1
36 select ARCH_USE_QUEUED_RWLOCKS
38 select PCI_DOMAINS_GENERIC if PCI
40 select ARCH_WANT_FRAME_POINTERS
41 select GENERIC_IRQ_MULTI_HANDLER
42 select MMU_GATHER_NO_RANGE if MMU
43 select TRACE_IRQFLAGS_SUPPORT
51 config GENERIC_HWEIGHT
57 # For now, use generic checksum functions
58 #These can be reimplemented in assembly later if so inclined
62 config STACKTRACE_SUPPORT
65 config LOCKDEP_SUPPORT
68 menu "Processor type and features"
71 prompt "Subarchitecture"
77 Generic OpenRISC 1200 architecture
81 config DCACHE_WRITETHROUGH
82 bool "Have write through data caches"
85 Select this if your implementation features write through data caches.
86 Selecting 'N' here will allow the kernel to force flushing of data
87 caches at relevant times. Most OpenRISC implementations support write-
92 config OPENRISC_BUILTIN_DTB
96 menu "Class II Instructions"
98 config OPENRISC_HAVE_INST_FF1
99 bool "Have instruction l.ff1"
102 Select this if your implementation has the Class II instruction l.ff1
104 config OPENRISC_HAVE_INST_FL1
105 bool "Have instruction l.fl1"
108 Select this if your implementation has the Class II instruction l.fl1
110 config OPENRISC_HAVE_INST_MUL
111 bool "Have instruction l.mul for hardware multiply"
114 Select this if your implementation has a hardware multiply instruction
116 config OPENRISC_HAVE_INST_DIV
117 bool "Have instruction l.div for hardware divide"
120 Select this if your implementation has a hardware divide instruction
122 config OPENRISC_HAVE_INST_CMOV
123 bool "Have instruction l.cmov for conditional move"
126 This config enables gcc to generate l.cmov instructions when compiling
127 the kernel which in general will improve performance and reduce the
130 Select this if your implementation has support for the Class II
131 l.cmov conistional move instruction.
133 Say N if you are unsure.
135 config OPENRISC_HAVE_INST_ROR
136 bool "Have instruction l.ror for rotate right"
139 This config enables gcc to generate l.ror instructions when compiling
140 the kernel which in general will improve performance and reduce the
143 Select this if your implementation has support for the Class II
144 l.ror rotate right instruction.
146 Say N if you are unsure.
148 config OPENRISC_HAVE_INST_RORI
149 bool "Have instruction l.rori for rotate right with immediate"
152 This config enables gcc to generate l.rori instructions when compiling
153 the kernel which in general will improve performance and reduce the
156 Select this if your implementation has support for the Class II
157 l.rori rotate right with immediate instruction.
159 Say N if you are unsure.
161 config OPENRISC_HAVE_INST_SEXT
162 bool "Have instructions l.ext* for sign extension"
165 This config enables gcc to generate l.ext* instructions when compiling
166 the kernel which in general will improve performance and reduce the
169 Select this if your implementation has support for the Class II
170 l.exths, l.extbs, l.exthz and l.extbz size extend instructions.
172 Say N if you are unsure.
177 int "Maximum number of CPUs (2-32)"
183 bool "Symmetric Multi-Processing support"
185 This enables support for systems with more than one CPU. If you have
186 a system with only one CPU, say N. If you have a system with more
189 If you don't know what to do here, say N.
195 Say N here if you want to disable all floating-point related procedures
196 in the kernel and reduce binary size.
198 If you don't know what to do here, say Y.
200 source "kernel/Kconfig.hz"
202 config OPENRISC_NO_SPR_SR_DSX
203 bool "use SPR_SR_DSX software emulation" if OR1K_1200
206 SPR_SR_DSX bit is status register bit indicating whether
207 the last exception has happened in delay slot.
209 OpenRISC architecture makes it optional to have it implemented
210 in hardware and the OR1200 does not have it.
212 Say N here if you know that your OpenRISC processor has
213 SPR_SR_DSX bit implemented. Say Y if you are unsure.
215 config OPENRISC_HAVE_SHADOW_GPRS
216 bool "Support for shadow gpr files" if !SMP
219 Say Y here if your OpenRISC processor features shadowed
220 register files. They will in such case be used as a
221 scratch reg storage on exception entry.
223 On SMP systems, this feature is mandatory.
224 On a unicore system it's safe to say N here if you are unsure.
227 string "Default kernel command string"
230 On some architectures there is currently no way for the boot loader
231 to pass arguments to the kernel. For these architectures, you should
232 supply some command-line options at build time by entering them
235 menu "Debugging options"
237 config JUMP_UPON_UNHANDLED_EXCEPTION
238 bool "Try to die gracefully"
241 Now this puts kernel into infinite loop after first oops. Till
242 your kernel crashes this doesn't have any influence.
244 Say Y if you are unsure.
246 config OPENRISC_ESR_EXCEPTION_BUG_CHECK
247 bool "Check for possible ESR exception bug"
250 This option enables some checks that might expose some problems
253 Say N if you are unsure.