arch/microblaze/Kconfig

   1 # SPDX-License-Identifier: GPL-2.0-only
   2 config MICROBLAZE
   3         def_bool y
   4         select ARCH_32BIT_OFF_T
   5         select ARCH_NO_SWAP
   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
  15         select TIMER_OF
  16         select CLONE_BACKWARDS3
  17         select COMMON_CLK
  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
  27         select HAVE_ARCH_HASH
  28         select HAVE_ARCH_KGDB
  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
  35         select HAVE_OPROFILE
  36         select HAVE_PCI
  37         select IRQ_DOMAIN
  38         select XILINX_INTC
  39         select MODULES_USE_ELF_RELA
  40         select OF
  41         select OF_EARLY_FLATTREE
  42         select PCI_DOMAINS_GENERIC if PCI
  43         select PCI_SYSCALL if PCI
  44         select TRACING_SUPPORT
  45         select VIRT_TO_BUS
  46         select CPU_NO_EFFICIENT_FFS
  47         select MMU_GATHER_NO_RANGE if MMU
  48         select SPARSE_IRQ
  49
  50 # Endianness selection
  51 choice
  52         prompt "Endianness selection"
  53         default CPU_LITTLE_ENDIAN
  54         help
  55           microblaze architectures can be configured for either little or
  56           big endian formats. Be sure to select the appropriate mode.
  57
  58 config CPU_BIG_ENDIAN
  59         bool "Big endian"
  60
  61 config CPU_LITTLE_ENDIAN
  62         bool "Little endian"
  63
  64 endchoice
  65
  66 config ZONE_DMA
  67         def_bool y
  68
  69 config ARCH_HAS_ILOG2_U32
  70         def_bool n
  71
  72 config ARCH_HAS_ILOG2_U64
  73         def_bool n
  74
  75 config GENERIC_HWEIGHT
  76         def_bool y
  77
  78 config GENERIC_CALIBRATE_DELAY
  79         def_bool y
  80
  81 config GENERIC_CSUM
  82         def_bool y
  83
  84 config STACKTRACE_SUPPORT
  85         def_bool y
  86
  87 config LOCKDEP_SUPPORT
  88         def_bool y
  89
  90 source "arch/microblaze/Kconfig.platform"
  91
  92 menu "Processor type and features"
  93
  94 source "kernel/Kconfig.hz"
  95
  96 config MMU
  97         bool "MMU support"
  98         default n
  99
 100 comment "Boot options"
 101
 102 config CMDLINE_BOOL
 103         bool "Default bootloader kernel arguments"
 104
 105 config CMDLINE
 106         string "Default kernel command string"
 107         depends on CMDLINE_BOOL
 108         default "console=ttyUL0,115200"
 109         help
 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
 113           here.
 114
 115 config CMDLINE_FORCE
 116         bool "Force default kernel command string"
 117         depends on CMDLINE_BOOL
 118         default n
 119         help
 120           Set this to have arguments from the default kernel command string
 121           override those passed by the boot loader.
 122
 123 config SECCOMP
 124         bool "Enable seccomp to safely compute untrusted bytecode"
 125         depends on PROC_FS
 126         default y
 127         help
 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.
 137
 138           If unsure, say Y. Only embedded should say N here.
 139
 140 endmenu
 141
 142 menu "Kernel features"
 143
 144 config NR_CPUS
 145         int
 146         default "1"
 147
 148 config ADVANCED_OPTIONS
 149         bool "Prompt for advanced kernel configuration options"
 150         help
 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.
 155
 156           Unless you know what you are doing, say N here.
 157
 158 comment "Default settings for advanced configuration options are used"
 159         depends on !ADVANCED_OPTIONS
 160
 161 config XILINX_UNCACHED_SHADOW
 162         bool "Are you using uncached shadow for RAM ?"
 163         depends on ADVANCED_OPTIONS && !MMU
 164         default n
 165         help
 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.
 169
 170 config HIGHMEM
 171         bool "High memory support"
 172         depends on MMU
 173         help
 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".
 180
 181           If unsure, say n.
 182
 183 config LOWMEM_SIZE_BOOL
 184         bool "Set maximum low memory"
 185         depends on ADVANCED_OPTIONS && MMU
 186         help
 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
 191           memory.
 192
 193           Say N here unless you know what you are doing.
 194
 195 config LOWMEM_SIZE
 196         hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
 197         default "0x30000000"
 198
 199 config MANUAL_RESET_VECTOR
 200         hex "Microblaze reset vector address setup"
 201         default "0x0"
 202         help
 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
 205           address 0x0.
 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.
 209
 210 config KERNEL_START_BOOL
 211         bool "Set custom kernel base address"
 212         depends on ADVANCED_OPTIONS
 213         help
 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.
 218
 219           Say N here unless you know what you are doing.
 220
 221 config KERNEL_START
 222         hex "Virtual address of kernel base" if KERNEL_START_BOOL
 223         default "0xc0000000" if MMU
 224         default KERNEL_BASE_ADDR if !MMU
 225
 226 config TASK_SIZE_BOOL
 227         bool "Set custom user task size"
 228         depends on ADVANCED_OPTIONS && MMU
 229         help
 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.
 233
 234           Say N here unless you know what you are doing.
 235
 236 config TASK_SIZE
 237         hex "Size of user task space" if TASK_SIZE_BOOL
 238         default "0x80000000"
 239
 240 choice
 241         prompt "Page size"
 242         default MICROBLAZE_4K_PAGES
 243         depends on ADVANCED_OPTIONS && !MMU
 244         help
 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.
 253
 254           If unsure, choose 4K_PAGES.
 255
 256 config MICROBLAZE_4K_PAGES
 257         bool "4k page size"
 258
 259 config MICROBLAZE_16K_PAGES
 260         bool "16k page size"
 261
 262 config MICROBLAZE_64K_PAGES
 263         bool "64k page size"
 264
 265 endchoice
 266
 267 endmenu
 268
 269 menu "Bus Options"
 270
 271 config PCI_XILINX
 272         bool "Xilinx PCI host bridge support"
 273         depends on PCI
 274
 275 endmenu