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_DMA_COHERENT_TO_PFN if MMU
   7         select ARCH_HAS_GCOV_PROFILE_ALL
   8         select ARCH_HAS_SYNC_DMA_FOR_CPU
   9         select ARCH_HAS_SYNC_DMA_FOR_DEVICE
  10         select ARCH_MIGHT_HAVE_PC_PARPORT
  11         select ARCH_NO_COHERENT_DMA_MMAP if !MMU
  12         select ARCH_WANT_IPC_PARSE_VERSION
  13         select BUILDTIME_EXTABLE_SORT
  14         select TIMER_OF
  15         select CLONE_BACKWARDS3
  16         select COMMON_CLK
  17         select GENERIC_ATOMIC64
  18         select GENERIC_CLOCKEVENTS
  19         select GENERIC_CPU_DEVICES
  20         select GENERIC_IDLE_POLL_SETUP
  21         select GENERIC_IRQ_PROBE
  22         select GENERIC_IRQ_SHOW
  23         select GENERIC_PCI_IOMAP
  24         select GENERIC_SCHED_CLOCK
  25         select HAVE_ARCH_HASH
  26         select HAVE_ARCH_KGDB
  27         select HAVE_DEBUG_KMEMLEAK
  28         select HAVE_DYNAMIC_FTRACE
  29         select HAVE_FTRACE_MCOUNT_RECORD
  30         select HAVE_FUNCTION_GRAPH_TRACER
  31         select HAVE_FUNCTION_TRACER
  32         select HAVE_MEMBLOCK_NODE_MAP
  33         select HAVE_OPROFILE
  34         select HAVE_PCI
  35         select IRQ_DOMAIN
  36         select XILINX_INTC
  37         select MODULES_USE_ELF_RELA
  38         select OF
  39         select OF_EARLY_FLATTREE
  40         select PCI_DOMAINS_GENERIC if PCI
  41         select PCI_SYSCALL if PCI
  42         select TRACING_SUPPORT
  43         select VIRT_TO_BUS
  44         select CPU_NO_EFFICIENT_FFS
  45         select MMU_GATHER_NO_RANGE if MMU
  46
  47 # Endianness selection
  48 choice
  49         prompt "Endianness selection"
  50         default CPU_LITTLE_ENDIAN
  51         help
  52           microblaze architectures can be configured for either little or
  53           big endian formats. Be sure to select the appropriate mode.
  54
  55 config CPU_BIG_ENDIAN
  56         bool "Big endian"
  57
  58 config CPU_LITTLE_ENDIAN
  59         bool "Little endian"
  60
  61 endchoice
  62
  63 config ZONE_DMA
  64         def_bool y
  65
  66 config ARCH_HAS_ILOG2_U32
  67         def_bool n
  68
  69 config ARCH_HAS_ILOG2_U64
  70         def_bool n
  71
  72 config GENERIC_HWEIGHT
  73         def_bool y
  74
  75 config GENERIC_CALIBRATE_DELAY
  76         def_bool y
  77
  78 config GENERIC_CSUM
  79         def_bool y
  80
  81 config STACKTRACE_SUPPORT
  82         def_bool y
  83
  84 config LOCKDEP_SUPPORT
  85         def_bool y
  86
  87 source "arch/microblaze/Kconfig.platform"
  88
  89 menu "Processor type and features"
  90
  91 source "kernel/Kconfig.hz"
  92
  93 config MMU
  94         bool "MMU support"
  95         default n
  96
  97 comment "Boot options"
  98
  99 config CMDLINE_BOOL
 100         bool "Default bootloader kernel arguments"
 101
 102 config CMDLINE
 103         string "Default kernel command string"
 104         depends on CMDLINE_BOOL
 105         default "console=ttyUL0,115200"
 106         help
 107           On some architectures there is currently no way for the boot loader
 108           to pass arguments to the kernel. For these architectures, you should
 109           supply some command-line options at build time by entering them
 110           here.
 111
 112 config CMDLINE_FORCE
 113         bool "Force default kernel command string"
 114         depends on CMDLINE_BOOL
 115         default n
 116         help
 117           Set this to have arguments from the default kernel command string
 118           override those passed by the boot loader.
 119
 120 config SECCOMP
 121         bool "Enable seccomp to safely compute untrusted bytecode"
 122         depends on PROC_FS
 123         default y
 124         help
 125           This kernel feature is useful for number crunching applications
 126           that may need to compute untrusted bytecode during their
 127           execution. By using pipes or other transports made available to
 128           the process as file descriptors supporting the read/write
 129           syscalls, it's possible to isolate those applications in
 130           their own address space using seccomp. Once seccomp is
 131           enabled via /proc/<pid>/seccomp, it cannot be disabled
 132           and the task is only allowed to execute a few safe syscalls
 133           defined by each seccomp mode.
 134
 135           If unsure, say Y. Only embedded should say N here.
 136
 137 endmenu
 138
 139 menu "Kernel features"
 140
 141 config NR_CPUS
 142         int
 143         default "1"
 144
 145 config ADVANCED_OPTIONS
 146         bool "Prompt for advanced kernel configuration options"
 147         help
 148           This option will enable prompting for a variety of advanced kernel
 149           configuration options.  These options can cause the kernel to not
 150           work if they are set incorrectly, but can be used to optimize certain
 151           aspects of kernel memory management.
 152
 153           Unless you know what you are doing, say N here.
 154
 155 comment "Default settings for advanced configuration options are used"
 156         depends on !ADVANCED_OPTIONS
 157
 158 config XILINX_UNCACHED_SHADOW
 159         bool "Are you using uncached shadow for RAM ?"
 160         depends on ADVANCED_OPTIONS && !MMU
 161         default n
 162         help
 163           This is needed to be able to allocate uncachable memory regions.
 164           The feature requires the design to define the RAM memory controller
 165           window to be twice as large as the actual physical memory.
 166
 167 config HIGHMEM
 168         bool "High memory support"
 169         depends on MMU
 170         help
 171           The address space of Microblaze processors is only 4 Gigabytes large
 172           and it has to accommodate user address space, kernel address
 173           space as well as some memory mapped IO. That means that, if you
 174           have a large amount of physical memory and/or IO, not all of the
 175           memory can be "permanently mapped" by the kernel. The physical
 176           memory that is not permanently mapped is called "high memory".
 177
 178           If unsure, say n.
 179
 180 config LOWMEM_SIZE_BOOL
 181         bool "Set maximum low memory"
 182         depends on ADVANCED_OPTIONS && MMU
 183         help
 184           This option allows you to set the maximum amount of memory which
 185           will be used as "low memory", that is, memory which the kernel can
 186           access directly, without having to set up a kernel virtual mapping.
 187           This can be useful in optimizing the layout of kernel virtual
 188           memory.
 189
 190           Say N here unless you know what you are doing.
 191
 192 config LOWMEM_SIZE
 193         hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
 194         default "0x30000000"
 195
 196 config MANUAL_RESET_VECTOR
 197         hex "Microblaze reset vector address setup"
 198         default "0x0"
 199         help
 200           Set this option to have the kernel override the CPU Reset vector.
 201           If zero, no change will be made to the MicroBlaze reset vector at
 202           address 0x0.
 203           If non-zero, a jump instruction to this address, will be written
 204           to the reset vector at address 0x0.
 205           If you are unsure, set it to default value 0x0.
 206
 207 config KERNEL_START_BOOL
 208         bool "Set custom kernel base address"
 209         depends on ADVANCED_OPTIONS
 210         help
 211           This option allows you to set the kernel virtual address at which
 212           the kernel will map low memory (the kernel image will be linked at
 213           this address).  This can be useful in optimizing the virtual memory
 214           layout of the system.
 215
 216           Say N here unless you know what you are doing.
 217
 218 config KERNEL_START
 219         hex "Virtual address of kernel base" if KERNEL_START_BOOL
 220         default "0xc0000000" if MMU
 221         default KERNEL_BASE_ADDR if !MMU
 222
 223 config TASK_SIZE_BOOL
 224         bool "Set custom user task size"
 225         depends on ADVANCED_OPTIONS && MMU
 226         help
 227           This option allows you to set the amount of virtual address space
 228           allocated to user tasks.  This can be useful in optimizing the
 229           virtual memory layout of the system.
 230
 231           Say N here unless you know what you are doing.
 232
 233 config TASK_SIZE
 234         hex "Size of user task space" if TASK_SIZE_BOOL
 235         default "0x80000000"
 236
 237 choice
 238         prompt "Page size"
 239         default MICROBLAZE_4K_PAGES
 240         depends on ADVANCED_OPTIONS && !MMU
 241         help
 242           Select the kernel logical page size. Increasing the page size
 243           will reduce software overhead at each page boundary, allow
 244           hardware prefetch mechanisms to be more effective, and allow
 245           larger dma transfers increasing IO efficiency and reducing
 246           overhead. However the utilization of memory will increase.
 247           For example, each cached file will using a multiple of the
 248           page size to hold its contents and the difference between the
 249           end of file and the end of page is wasted.
 250
 251           If unsure, choose 4K_PAGES.
 252
 253 config MICROBLAZE_4K_PAGES
 254         bool "4k page size"
 255
 256 config MICROBLAZE_16K_PAGES
 257         bool "16k page size"
 258
 259 config MICROBLAZE_64K_PAGES
 260         bool "64k page size"
 261
 262 endchoice
 263
 264 endmenu
 265
 266 menu "Bus Options"
 267
 268 config PCI_XILINX
 269         bool "Xilinx PCI host bridge support"
 270         depends on PCI
 271
 272 endmenu