xref: /openbmc/linux/arch/microblaze/Kconfig (revision dc6a81c3)

# SPDX-License-Identifier: GPL-2.0-only
config MICROBLAZE
	def_bool y
	select ARCH_32BIT_OFF_T
	select ARCH_NO_SWAP
	select ARCH_HAS_BINFMT_FLAT if !MMU
	select ARCH_HAS_DMA_PREP_COHERENT
	select ARCH_HAS_GCOV_PROFILE_ALL
	select ARCH_HAS_SYNC_DMA_FOR_CPU
	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
	select ARCH_HAS_UNCACHED_SEGMENT if !MMU
	select ARCH_MIGHT_HAVE_PC_PARPORT
	select ARCH_WANT_IPC_PARSE_VERSION
	select BUILDTIME_TABLE_SORT
	select TIMER_OF
	select CLONE_BACKWARDS3
	select COMMON_CLK
	select DMA_DIRECT_REMAP if MMU
	select GENERIC_ATOMIC64
	select GENERIC_CLOCKEVENTS
	select GENERIC_CPU_DEVICES
	select GENERIC_IDLE_POLL_SETUP
	select GENERIC_IRQ_PROBE
	select GENERIC_IRQ_SHOW
	select GENERIC_PCI_IOMAP
	select GENERIC_SCHED_CLOCK
	select HAVE_ARCH_HASH
	select HAVE_ARCH_KGDB
	select HAVE_DEBUG_KMEMLEAK
	select HAVE_DMA_CONTIGUOUS
	select HAVE_DYNAMIC_FTRACE
	select HAVE_FTRACE_MCOUNT_RECORD
	select HAVE_FUNCTION_GRAPH_TRACER
	select HAVE_FUNCTION_TRACER
	select HAVE_MEMBLOCK_NODE_MAP
	select HAVE_OPROFILE
	select HAVE_PCI
	select IRQ_DOMAIN
	select XILINX_INTC
	select MODULES_USE_ELF_RELA
	select OF
	select OF_EARLY_FLATTREE
	select PCI_DOMAINS_GENERIC if PCI
	select PCI_SYSCALL if PCI
	select TRACING_SUPPORT
	select VIRT_TO_BUS
	select CPU_NO_EFFICIENT_FFS
	select MMU_GATHER_NO_RANGE if MMU
	select SPARSE_IRQ

# Endianness selection
choice
	prompt "Endianness selection"
	default CPU_LITTLE_ENDIAN
	help
	  microblaze architectures can be configured for either little or
	  big endian formats. Be sure to select the appropriate mode.

config CPU_BIG_ENDIAN
	bool "Big endian"

config CPU_LITTLE_ENDIAN
	bool "Little endian"

endchoice

config ZONE_DMA
	def_bool y

config ARCH_HAS_ILOG2_U32
	def_bool n

config ARCH_HAS_ILOG2_U64
	def_bool n

config GENERIC_HWEIGHT
	def_bool y

config GENERIC_CALIBRATE_DELAY
	def_bool y

config GENERIC_CSUM
	def_bool y

config STACKTRACE_SUPPORT
	def_bool y

config LOCKDEP_SUPPORT
	def_bool y

source "arch/microblaze/Kconfig.platform"

menu "Processor type and features"

source "kernel/Kconfig.hz"

config MMU
	bool "MMU support"
	default n

comment "Boot options"

config CMDLINE_BOOL
	bool "Default bootloader kernel arguments"

config CMDLINE
	string "Default kernel command string"
	depends on CMDLINE_BOOL
	default "console=ttyUL0,115200"
	help
	  On some architectures there is currently no way for the boot loader
	  to pass arguments to the kernel. For these architectures, you should
	  supply some command-line options at build time by entering them
	  here.

config CMDLINE_FORCE
	bool "Force default kernel command string"
	depends on CMDLINE_BOOL
	default n
	help
	  Set this to have arguments from the default kernel command string
	  override those passed by the boot loader.

config SECCOMP
	bool "Enable seccomp to safely compute untrusted bytecode"
	depends on PROC_FS
	default y
	help
	  This kernel feature is useful for number crunching applications
	  that may need to compute untrusted bytecode during their
	  execution. By using pipes or other transports made available to
	  the process as file descriptors supporting the read/write
	  syscalls, it's possible to isolate those applications in
	  their own address space using seccomp. Once seccomp is
	  enabled via /proc/<pid>/seccomp, it cannot be disabled
	  and the task is only allowed to execute a few safe syscalls
	  defined by each seccomp mode.

	  If unsure, say Y. Only embedded should say N here.

endmenu

menu "Kernel features"

config NR_CPUS
	int
	default "1"

config ADVANCED_OPTIONS
	bool "Prompt for advanced kernel configuration options"
	help
	  This option will enable prompting for a variety of advanced kernel
	  configuration options.  These options can cause the kernel to not
	  work if they are set incorrectly, but can be used to optimize certain
	  aspects of kernel memory management.

	  Unless you know what you are doing, say N here.

comment "Default settings for advanced configuration options are used"
	depends on !ADVANCED_OPTIONS

config XILINX_UNCACHED_SHADOW
	bool "Are you using uncached shadow for RAM ?"
	depends on ADVANCED_OPTIONS && !MMU
	default n
	help
	  This is needed to be able to allocate uncachable memory regions.
	  The feature requires the design to define the RAM memory controller
	  window to be twice as large as the actual physical memory.

config HIGHMEM
	bool "High memory support"
	depends on MMU
	help
	  The address space of Microblaze processors is only 4 Gigabytes large
	  and it has to accommodate user address space, kernel address
	  space as well as some memory mapped IO. That means that, if you
	  have a large amount of physical memory and/or IO, not all of the
	  memory can be "permanently mapped" by the kernel. The physical
	  memory that is not permanently mapped is called "high memory".

	  If unsure, say n.

config LOWMEM_SIZE_BOOL
	bool "Set maximum low memory"
	depends on ADVANCED_OPTIONS && MMU
	help
	  This option allows you to set the maximum amount of memory which
	  will be used as "low memory", that is, memory which the kernel can
	  access directly, without having to set up a kernel virtual mapping.
	  This can be useful in optimizing the layout of kernel virtual
	  memory.

	  Say N here unless you know what you are doing.

config LOWMEM_SIZE
	hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
	default "0x30000000"

config MANUAL_RESET_VECTOR
	hex "Microblaze reset vector address setup"
	default "0x0"
	help
	  Set this option to have the kernel override the CPU Reset vector.
	  If zero, no change will be made to the MicroBlaze reset vector at
	  address 0x0.
	  If non-zero, a jump instruction to this address, will be written
	  to the reset vector at address 0x0.
	  If you are unsure, set it to default value 0x0.

config KERNEL_START_BOOL
	bool "Set custom kernel base address"
	depends on ADVANCED_OPTIONS
	help
	  This option allows you to set the kernel virtual address at which
	  the kernel will map low memory (the kernel image will be linked at
	  this address).  This can be useful in optimizing the virtual memory
	  layout of the system.

	  Say N here unless you know what you are doing.

config KERNEL_START
	hex "Virtual address of kernel base" if KERNEL_START_BOOL
	default "0xc0000000" if MMU
	default KERNEL_BASE_ADDR if !MMU

config TASK_SIZE_BOOL
	bool "Set custom user task size"
	depends on ADVANCED_OPTIONS && MMU
	help
	  This option allows you to set the amount of virtual address space
	  allocated to user tasks.  This can be useful in optimizing the
	  virtual memory layout of the system.

	  Say N here unless you know what you are doing.

config TASK_SIZE
	hex "Size of user task space" if TASK_SIZE_BOOL
	default "0x80000000"

choice
	prompt "Page size"
	default MICROBLAZE_4K_PAGES
	depends on ADVANCED_OPTIONS && !MMU
	help
	  Select the kernel logical page size. Increasing the page size
	  will reduce software overhead at each page boundary, allow
	  hardware prefetch mechanisms to be more effective, and allow
	  larger dma transfers increasing IO efficiency and reducing
	  overhead. However the utilization of memory will increase.
	  For example, each cached file will using a multiple of the
	  page size to hold its contents and the difference between the
	  end of file and the end of page is wasted.

	  If unsure, choose 4K_PAGES.

config MICROBLAZE_4K_PAGES
	bool "4k page size"

config MICROBLAZE_16K_PAGES
	bool "16k page size"

config MICROBLAZE_64K_PAGES
	bool "64k page size"

endchoice

endmenu

menu "Bus Options"

config PCI_XILINX
	bool "Xilinx PCI host bridge support"
	depends on PCI

endmenu