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45b02f8d94
The Kconfig symbol MAX_ACTIVE_REGIONS is unused. Commit
0ee332c145 ("memblock: Kill
early_node_map[]") removed the only place were it was actually used. But
it did not remove its Kconfig entries (for powerpc and sh).
Remove those two entries (and the entry for metag, that popped up in
v3.9-rc1).
Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Acked-by: Paul Mundt <lethal@linux-sh.org>
Acked-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
273 lines
6.6 KiB
Plaintext
273 lines
6.6 KiB
Plaintext
menu "Memory management options"
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config QUICKLIST
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def_bool y
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config MMU
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bool "Support for memory management hardware"
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depends on !CPU_SH2
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default y
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help
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Some SH processors (such as SH-2/SH-2A) lack an MMU. In order to
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boot on these systems, this option must not be set.
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On other systems (such as the SH-3 and 4) where an MMU exists,
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turning this off will boot the kernel on these machines with the
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MMU implicitly switched off.
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config PAGE_OFFSET
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hex
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default "0x80000000" if MMU && SUPERH32
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default "0x20000000" if MMU && SUPERH64
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default "0x00000000"
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config FORCE_MAX_ZONEORDER
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int "Maximum zone order"
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range 9 64 if PAGE_SIZE_16KB
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default "9" if PAGE_SIZE_16KB
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range 7 64 if PAGE_SIZE_64KB
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default "7" if PAGE_SIZE_64KB
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range 11 64
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default "14" if !MMU
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default "11"
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help
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The kernel memory allocator divides physically contiguous memory
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blocks into "zones", where each zone is a power of two number of
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pages. This option selects the largest power of two that the kernel
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keeps in the memory allocator. If you need to allocate very large
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blocks of physically contiguous memory, then you may need to
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increase this value.
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This config option is actually maximum order plus one. For example,
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a value of 11 means that the largest free memory block is 2^10 pages.
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The page size is not necessarily 4KB. Keep this in mind when
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choosing a value for this option.
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config MEMORY_START
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hex "Physical memory start address"
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default "0x08000000"
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---help---
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Computers built with Hitachi SuperH processors always
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map the ROM starting at address zero. But the processor
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does not specify the range that RAM takes.
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The physical memory (RAM) start address will be automatically
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set to 08000000. Other platforms, such as the Solution Engine
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boards typically map RAM at 0C000000.
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Tweak this only when porting to a new machine which does not
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already have a defconfig. Changing it from the known correct
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value on any of the known systems will only lead to disaster.
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config MEMORY_SIZE
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hex "Physical memory size"
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default "0x04000000"
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help
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This sets the default memory size assumed by your SH kernel. It can
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be overridden as normal by the 'mem=' argument on the kernel command
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line. If unsure, consult your board specifications or just leave it
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as 0x04000000 which was the default value before this became
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configurable.
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# Physical addressing modes
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config 29BIT
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def_bool !32BIT
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depends on SUPERH32
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select UNCACHED_MAPPING
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config 32BIT
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bool
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default y if CPU_SH5 || !MMU
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config PMB
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bool "Support 32-bit physical addressing through PMB"
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depends on MMU && CPU_SH4A && !CPU_SH4AL_DSP
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select 32BIT
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select UNCACHED_MAPPING
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help
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If you say Y here, physical addressing will be extended to
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32-bits through the SH-4A PMB. If this is not set, legacy
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29-bit physical addressing will be used.
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config X2TLB
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def_bool y
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depends on (CPU_SHX2 || CPU_SHX3) && MMU
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config VSYSCALL
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bool "Support vsyscall page"
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depends on MMU && (CPU_SH3 || CPU_SH4)
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default y
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help
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This will enable support for the kernel mapping a vDSO page
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in process space, and subsequently handing down the entry point
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to the libc through the ELF auxiliary vector.
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From the kernel side this is used for the signal trampoline.
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For systems with an MMU that can afford to give up a page,
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(the default value) say Y.
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config NUMA
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bool "Non Uniform Memory Access (NUMA) Support"
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depends on MMU && SYS_SUPPORTS_NUMA
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select ARCH_WANT_NUMA_VARIABLE_LOCALITY
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default n
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help
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Some SH systems have many various memories scattered around
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the address space, each with varying latencies. This enables
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support for these blocks by binding them to nodes and allowing
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memory policies to be used for prioritizing and controlling
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allocation behaviour.
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config NODES_SHIFT
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int
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default "3" if CPU_SUBTYPE_SHX3
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default "1"
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depends on NEED_MULTIPLE_NODES
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config ARCH_FLATMEM_ENABLE
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def_bool y
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depends on !NUMA
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config ARCH_SPARSEMEM_ENABLE
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def_bool y
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select SPARSEMEM_STATIC
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config ARCH_SPARSEMEM_DEFAULT
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def_bool y
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config ARCH_SELECT_MEMORY_MODEL
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def_bool y
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config ARCH_ENABLE_MEMORY_HOTPLUG
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def_bool y
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depends on SPARSEMEM && MMU
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config ARCH_ENABLE_MEMORY_HOTREMOVE
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def_bool y
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depends on SPARSEMEM && MMU
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config ARCH_MEMORY_PROBE
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def_bool y
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depends on MEMORY_HOTPLUG
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config IOREMAP_FIXED
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def_bool y
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depends on X2TLB || SUPERH64
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config UNCACHED_MAPPING
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bool
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config HAVE_SRAM_POOL
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bool
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select GENERIC_ALLOCATOR
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choice
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prompt "Kernel page size"
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default PAGE_SIZE_4KB
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config PAGE_SIZE_4KB
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bool "4kB"
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help
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This is the default page size used by all SuperH CPUs.
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config PAGE_SIZE_8KB
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bool "8kB"
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depends on !MMU || X2TLB
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help
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This enables 8kB pages as supported by SH-X2 and later MMUs.
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config PAGE_SIZE_16KB
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bool "16kB"
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depends on !MMU
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help
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This enables 16kB pages on MMU-less SH systems.
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config PAGE_SIZE_64KB
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bool "64kB"
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depends on !MMU || CPU_SH4 || CPU_SH5
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help
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This enables support for 64kB pages, possible on all SH-4
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CPUs and later.
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endchoice
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choice
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prompt "HugeTLB page size"
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depends on HUGETLB_PAGE
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default HUGETLB_PAGE_SIZE_1MB if PAGE_SIZE_64KB
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default HUGETLB_PAGE_SIZE_64K
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config HUGETLB_PAGE_SIZE_64K
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bool "64kB"
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depends on !PAGE_SIZE_64KB
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config HUGETLB_PAGE_SIZE_256K
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bool "256kB"
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depends on X2TLB
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config HUGETLB_PAGE_SIZE_1MB
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bool "1MB"
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config HUGETLB_PAGE_SIZE_4MB
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bool "4MB"
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depends on X2TLB
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config HUGETLB_PAGE_SIZE_64MB
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bool "64MB"
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depends on X2TLB
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config HUGETLB_PAGE_SIZE_512MB
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bool "512MB"
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depends on CPU_SH5
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endchoice
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source "mm/Kconfig"
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config SCHED_MC
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bool "Multi-core scheduler support"
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depends on SMP
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default y
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help
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Multi-core scheduler support improves the CPU scheduler's decision
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making when dealing with multi-core CPU chips at a cost of slightly
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increased overhead in some places. If unsure say N here.
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endmenu
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menu "Cache configuration"
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config SH7705_CACHE_32KB
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bool "Enable 32KB cache size for SH7705"
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depends on CPU_SUBTYPE_SH7705
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default y
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choice
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prompt "Cache mode"
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default CACHE_WRITEBACK if CPU_SH2A || CPU_SH3 || CPU_SH4 || CPU_SH5
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default CACHE_WRITETHROUGH if (CPU_SH2 && !CPU_SH2A)
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config CACHE_WRITEBACK
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bool "Write-back"
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config CACHE_WRITETHROUGH
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bool "Write-through"
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help
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Selecting this option will configure the caches in write-through
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mode, as opposed to the default write-back configuration.
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Since there's sill some aliasing issues on SH-4, this option will
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unfortunately still require the majority of flushing functions to
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be implemented to deal with aliasing.
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If unsure, say N.
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config CACHE_OFF
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bool "Off"
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endchoice
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endmenu
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