linux/arch/openrisc/Kconfig
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   1# SPDX-License-Identifier: GPL-2.0
   2#
   3# For a description of the syntax of this configuration file,
   4# see Documentation/kbuild/kconfig-language.rst.
   5#
   6
   7config OPENRISC
   8        def_bool y
   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
  13        select COMMON_CLK
  14        select OF
  15        select OF_EARLY_FLATTREE
  16        select IRQ_DOMAIN
  17        select GPIOLIB
  18        select HAVE_ARCH_TRACEHOOK
  19        select SPARSE_IRQ
  20        select GENERIC_IRQ_CHIP
  21        select GENERIC_IRQ_PROBE
  22        select GENERIC_IRQ_SHOW
  23        select GENERIC_IOMAP
  24        select GENERIC_CPU_DEVICES
  25        select HAVE_UID16
  26        select GENERIC_ATOMIC64
  27        select GENERIC_CLOCKEVENTS_BROADCAST
  28        select GENERIC_SMP_IDLE_THREAD
  29        select MODULES_USE_ELF_RELA
  30        select HAVE_DEBUG_STACKOVERFLOW
  31        select OR1K_PIC
  32        select CPU_NO_EFFICIENT_FFS if !OPENRISC_HAVE_INST_FF1
  33        select ARCH_USE_QUEUED_SPINLOCKS
  34        select ARCH_USE_QUEUED_RWLOCKS
  35        select OMPIC if SMP
  36        select ARCH_WANT_FRAME_POINTERS
  37        select GENERIC_IRQ_MULTI_HANDLER
  38        select MMU_GATHER_NO_RANGE if MMU
  39        select TRACE_IRQFLAGS_SUPPORT
  40
  41config CPU_BIG_ENDIAN
  42        def_bool y
  43
  44config MMU
  45        def_bool y
  46
  47config GENERIC_HWEIGHT
  48        def_bool y
  49
  50config NO_IOPORT_MAP
  51        def_bool y
  52
  53# For now, use generic checksum functions
  54#These can be reimplemented in assembly later if so inclined
  55config GENERIC_CSUM
  56        def_bool y
  57
  58config STACKTRACE_SUPPORT
  59        def_bool y
  60
  61config LOCKDEP_SUPPORT
  62        def_bool  y
  63
  64menu "Processor type and features"
  65
  66choice
  67        prompt "Subarchitecture"
  68        default OR1K_1200
  69
  70config OR1K_1200
  71        bool "OR1200"
  72        help
  73          Generic OpenRISC 1200 architecture
  74
  75endchoice
  76
  77config DCACHE_WRITETHROUGH
  78        bool "Have write through data caches"
  79        default n
  80        help
  81          Select this if your implementation features write through data caches.
  82          Selecting 'N' here will allow the kernel to force flushing of data
  83          caches at relevant times. Most OpenRISC implementations support write-
  84          through data caches.
  85
  86          If unsure say N here
  87
  88config OPENRISC_BUILTIN_DTB
  89        string "Builtin DTB"
  90        default ""
  91
  92menu "Class II Instructions"
  93
  94config OPENRISC_HAVE_INST_FF1
  95        bool "Have instruction l.ff1"
  96        default y
  97        help
  98          Select this if your implementation has the Class II instruction l.ff1
  99
 100config OPENRISC_HAVE_INST_FL1
 101        bool "Have instruction l.fl1"
 102        default y
 103        help
 104          Select this if your implementation has the Class II instruction l.fl1
 105
 106config OPENRISC_HAVE_INST_MUL
 107        bool "Have instruction l.mul for hardware multiply"
 108        default y
 109        help
 110          Select this if your implementation has a hardware multiply instruction
 111
 112config OPENRISC_HAVE_INST_DIV
 113        bool "Have instruction l.div for hardware divide"
 114        default y
 115        help
 116          Select this if your implementation has a hardware divide instruction
 117endmenu
 118
 119config NR_CPUS
 120        int "Maximum number of CPUs (2-32)"
 121        range 2 32
 122        depends on SMP
 123        default "2"
 124
 125config SMP
 126        bool "Symmetric Multi-Processing support"
 127        help
 128          This enables support for systems with more than one CPU. If you have
 129          a system with only one CPU, say N. If you have a system with more
 130          than one CPU, say Y.
 131
 132          If you don't know what to do here, say N.
 133
 134source "kernel/Kconfig.hz"
 135
 136config OPENRISC_NO_SPR_SR_DSX
 137        bool "use SPR_SR_DSX software emulation" if OR1K_1200
 138        default y
 139        help
 140          SPR_SR_DSX bit is status register bit indicating whether
 141          the last exception has happened in delay slot.
 142
 143          OpenRISC architecture makes it optional to have it implemented
 144          in hardware and the OR1200 does not have it.
 145
 146          Say N here if you know that your OpenRISC processor has
 147          SPR_SR_DSX bit implemented. Say Y if you are unsure.
 148
 149config OPENRISC_HAVE_SHADOW_GPRS
 150        bool "Support for shadow gpr files" if !SMP
 151        default y if SMP
 152        help
 153          Say Y here if your OpenRISC processor features shadowed
 154          register files. They will in such case be used as a
 155          scratch reg storage on exception entry.
 156
 157          On SMP systems, this feature is mandatory.
 158          On a unicore system it's safe to say N here if you are unsure.
 159
 160config CMDLINE
 161        string "Default kernel command string"
 162        default ""
 163        help
 164          On some architectures there is currently no way for the boot loader
 165          to pass arguments to the kernel. For these architectures, you should
 166          supply some command-line options at build time by entering them
 167          here.
 168
 169menu "Debugging options"
 170
 171config JUMP_UPON_UNHANDLED_EXCEPTION
 172        bool "Try to die gracefully"
 173        default y
 174        help
 175          Now this puts kernel into infinite loop after first oops. Till
 176          your kernel crashes this doesn't have any influence.
 177
 178          Say Y if you are unsure.
 179
 180config OPENRISC_ESR_EXCEPTION_BUG_CHECK
 181        bool "Check for possible ESR exception bug"
 182        default n
 183        help
 184          This option enables some checks that might expose some problems
 185          in kernel.
 186
 187          Say N if you are unsure.
 188
 189endmenu
 190
 191endmenu
 192