arch/metag/Kconfig

   1 # SPDX-License-Identifier: GPL-2.0
   2 config METAG
   3         def_bool y
   4         select EMBEDDED
   5         select GENERIC_ATOMIC64
   6         select GENERIC_CLOCKEVENTS
   7         select GENERIC_IRQ_SHOW
   8         select GENERIC_SMP_IDLE_THREAD
   9         select HAVE_64BIT_ALIGNED_ACCESS
  10         select HAVE_ARCH_TRACEHOOK
  11         select HAVE_C_RECORDMCOUNT
  12         select HAVE_DEBUG_KMEMLEAK
  13         select HAVE_DEBUG_STACKOVERFLOW
  14         select HAVE_DYNAMIC_FTRACE
  15         select HAVE_EXIT_THREAD
  16         select HAVE_FTRACE_MCOUNT_RECORD
  17         select HAVE_FUNCTION_TRACER
  18         select HAVE_KERNEL_BZIP2
  19         select HAVE_KERNEL_GZIP
  20         select HAVE_KERNEL_LZO
  21         select HAVE_KERNEL_XZ
  22         select HAVE_MEMBLOCK
  23         select HAVE_MEMBLOCK_NODE_MAP
  24         select HAVE_MOD_ARCH_SPECIFIC
  25         select HAVE_OPROFILE
  26         select HAVE_PERF_EVENTS
  27         select HAVE_SYSCALL_TRACEPOINTS
  28         select HAVE_UNDERSCORE_SYMBOL_PREFIX
  29         select IRQ_DOMAIN
  30         select GENERIC_IRQ_EFFECTIVE_AFF_MASK
  31         select MODULES_USE_ELF_RELA
  32         select OF
  33         select OF_EARLY_FLATTREE
  34         select SPARSE_IRQ
  35         select CPU_NO_EFFICIENT_FFS
  36
  37 config STACKTRACE_SUPPORT
  38         def_bool y
  39
  40 config LOCKDEP_SUPPORT
  41         def_bool y
  42
  43 config RWSEM_GENERIC_SPINLOCK
  44         def_bool y
  45
  46 config RWSEM_XCHGADD_ALGORITHM
  47         bool
  48
  49 config GENERIC_HWEIGHT
  50         def_bool y
  51
  52 config GENERIC_CALIBRATE_DELAY
  53         def_bool y
  54
  55 config NO_IOPORT_MAP
  56         def_bool y
  57
  58 source "init/Kconfig"
  59
  60 source "kernel/Kconfig.freezer"
  61
  62 menu "Processor type and features"
  63
  64 config MMU
  65         def_bool y
  66
  67 config STACK_GROWSUP
  68         def_bool y
  69
  70 config HOTPLUG_CPU
  71         bool "Enable CPU hotplug support"
  72         depends on SMP
  73         help
  74           Say Y here to allow turning CPUs off and on. CPUs can be
  75           controlled through /sys/devices/system/cpu.
  76
  77           Say N if you want to disable CPU hotplug.
  78
  79 config HIGHMEM
  80         bool "High Memory Support"
  81         help
  82           The address space of Meta processors is only 4 Gigabytes large
  83           and it has to accommodate user address space, kernel address
  84           space as well as some memory mapped IO. That means that, if you
  85           have a large amount of physical memory and/or IO, not all of the
  86           memory can be "permanently mapped" by the kernel. The physical
  87           memory that is not permanently mapped is called "high memory".
  88
  89           Depending on the selected kernel/user memory split, minimum
  90           vmalloc space and actual amount of RAM, you may not need this
  91           option which should result in a slightly faster kernel.
  92
  93           If unsure, say n.
  94
  95 source "arch/metag/mm/Kconfig"
  96
  97 source "arch/metag/Kconfig.soc"
  98
  99 config METAG_META12
 100         bool
 101         help
 102           Select this from the SoC config symbol to indicate that it contains a
 103           Meta 1.2 core.
 104
 105 config METAG_META21
 106         bool
 107         help
 108           Select this from the SoC config symbol to indicate that it contains a
 109           Meta 2.1 core.
 110
 111 config SMP
 112         bool "Symmetric multi-processing support"
 113         depends on METAG_META21 && METAG_META21_MMU
 114         help
 115           This enables support for systems with more than one thread running
 116           Linux. If you have a system with only one thread running Linux,
 117           say N. Otherwise, say Y.
 118
 119 config NR_CPUS
 120         int "Maximum number of CPUs (2-4)" if SMP
 121         range 2 4 if SMP
 122         default "1" if !SMP
 123         default "4" if SMP
 124
 125 config METAG_SMP_WRITE_REORDERING
 126         bool
 127         help
 128           This attempts to prevent cache-memory incoherence due to external
 129           reordering of writes from different hardware threads when SMP is
 130           enabled. It adds fences (system event 0) to smp_mb and smp_rmb in an
 131           attempt to catch some of the cases, and also before writes to shared
 132           memory in LOCK1 protected atomics and spinlocks.
 133           This will not completely prevent cache incoherency on affected cores.
 134
 135 config METAG_LNKGET_AROUND_CACHE
 136         bool
 137         depends on METAG_META21
 138         help
 139           This indicates that the LNKGET/LNKSET instructions go around the
 140           cache, which requires some extra cache flushes when the memory needs
 141           to be accessed by normal GET/SET instructions too.
 142
 143 choice
 144         prompt "Atomicity primitive"
 145         default METAG_ATOMICITY_LNKGET
 146         help
 147           This option selects the mechanism for performing atomic operations.
 148
 149 config METAG_ATOMICITY_IRQSOFF
 150         depends on !SMP
 151         bool "irqsoff"
 152         help
 153           This option disables interrupts to achieve atomicity. This mechanism
 154           is not SMP-safe.
 155
 156 config METAG_ATOMICITY_LNKGET
 157         depends on METAG_META21
 158         bool "lnkget/lnkset"
 159         help
 160           This option uses the LNKGET and LNKSET instructions to achieve
 161           atomicity. LNKGET/LNKSET are load-link/store-conditional instructions.
 162           Choose this option if your system requires low latency.
 163
 164 config METAG_ATOMICITY_LOCK1
 165         depends on SMP
 166         bool "lock1"
 167         help
 168           This option uses the LOCK1 instruction for atomicity. This is mainly
 169           provided as a debugging aid if the lnkget/lnkset atomicity primitive
 170           isn't working properly.
 171
 172 endchoice
 173
 174 config METAG_FPU
 175         bool "FPU Support"
 176         depends on METAG_META21
 177         default y
 178         help
 179           This option allows processes to use FPU hardware available with this
 180           CPU. If this option is not enabled FPU registers will not be saved
 181           and restored on context-switch.
 182
 183           If you plan on running programs which are compiled to use hard floats
 184           say Y here.
 185
 186 config METAG_DSP
 187         bool "DSP Support"
 188         help
 189           This option allows processes to use DSP hardware available
 190           with this CPU. If this option is not enabled DSP registers
 191           will not be saved and restored on context-switch.
 192
 193           If you plan on running DSP programs say Y here.
 194
 195 config METAG_PERFCOUNTER_IRQS
 196         bool "PerfCounters interrupt support"
 197         depends on METAG_META21
 198         help
 199           This option enables using interrupts to collect information from
 200           Performance Counters. This option is supported in new META21
 201           (starting from HTP265).
 202
 203           When disabled, Performance Counters information will be collected
 204           based on Timer Interrupt.
 205
 206 config HW_PERF_EVENTS
 207         def_bool METAG_PERFCOUNTER_IRQS && PERF_EVENTS
 208
 209 config METAG_DA
 210         bool "DA support"
 211         help
 212           Say Y if you plan to use a DA debug adapter with Linux. The presence
 213           of the DA will be detected automatically at boot, so it is safe to say
 214           Y to this option even when booting without a DA.
 215
 216           This enables support for services provided by DA JTAG debug adapters,
 217           such as:
 218           - communication over DA channels (such as the console driver).
 219           - use of the DA filesystem.
 220
 221 menu "Boot options"
 222
 223 config METAG_BUILTIN_DTB
 224         bool "Embed DTB in kernel image"
 225         default y
 226         help
 227           Embeds a device tree binary in the kernel image.
 228
 229 config METAG_BUILTIN_DTB_NAME
 230         string "Built in DTB"
 231         depends on METAG_BUILTIN_DTB
 232         help
 233           Set the name of the DTB to embed (leave blank to pick one
 234           automatically based on kernel configuration).
 235
 236 config CMDLINE_BOOL
 237         bool "Default bootloader kernel arguments"
 238
 239 config CMDLINE
 240         string "Kernel command line"
 241         depends on CMDLINE_BOOL
 242         help
 243           On some architectures there is currently no way for the boot loader
 244           to pass arguments to the kernel. For these architectures, you should
 245           supply some command-line options at build time by entering them
 246           here.
 247
 248 config CMDLINE_FORCE
 249         bool "Force default kernel command string"
 250         depends on CMDLINE_BOOL
 251         help
 252           Set this to have arguments from the default kernel command string
 253           override those passed by the boot loader.
 254
 255 endmenu
 256
 257 source "kernel/Kconfig.preempt"
 258
 259 source kernel/Kconfig.hz
 260
 261 endmenu
 262
 263 menu "Power management options"
 264
 265 source kernel/power/Kconfig
 266
 267 endmenu
 268
 269 menu "Executable file formats"
 270
 271 source "fs/Kconfig.binfmt"
 272
 273 endmenu
 274
 275 source "net/Kconfig"
 276
 277 source "drivers/Kconfig"
 278
 279 source "fs/Kconfig"
 280
 281 source "arch/metag/Kconfig.debug"
 282
 283 source "security/Kconfig"
 284
 285 source "crypto/Kconfig"
 286
 287 source "lib/Kconfig"