1 menu "Memory management options"
7 bool "Support for memory management hardware"
11 Some SH processors (such as SH-2/SH-2A) lack an MMU. In order to
12 boot on these systems, this option must not be set.
14 On other systems (such as the SH-3 and 4) where an MMU exists,
15 turning this off will boot the kernel on these machines with the
16 MMU implicitly switched off.
20 default "0x80000000" if MMU && SUPERH32
21 default "0x20000000" if MMU && SUPERH64
25 hex "Physical memory start address"
28 Computers built with Hitachi SuperH processors always
29 map the ROM starting at address zero. But the processor
30 does not specify the range that RAM takes.
32 The physical memory (RAM) start address will be automatically
33 set to 08000000. Other platforms, such as the Solution Engine
34 boards typically map RAM at 0C000000.
36 Tweak this only when porting to a new machine which does not
37 already have a defconfig. Changing it from the known correct
38 value on any of the known systems will only lead to disaster.
41 hex "Physical memory size"
44 This sets the default memory size assumed by your SH kernel. It can
45 be overridden as normal by the 'mem=' argument on the kernel command
46 line. If unsure, consult your board specifications or just leave it
47 as 0x04000000 which was the default value before this became
50 # Physical addressing modes
61 bool "Support 32-bit physical addressing through PMB"
62 <<<<<<< HEAD:arch/sh/mm/Kconfig
63 depends on MMU && (CPU_SUBTYPE_SH7780 || CPU_SUBTYPE_SH7785)
65 depends on MMU && EXPERIMENTAL && (CPU_SUBTYPE_SH7780 || CPU_SUBTYPE_SH7785)
66 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:arch/sh/mm/Kconfig
70 If you say Y here, physical addressing will be extended to
71 32-bits through the SH-4A PMB. If this is not set, legacy
72 29-bit physical addressing will be used.
75 bool "Enable extended TLB mode"
76 depends on (CPU_SHX2 || CPU_SHX3) && MMU && EXPERIMENTAL
78 Selecting this option will enable the extended mode of the SH-X2
79 TLB. For legacy SH-X behaviour and interoperability, say N. For
80 all of the fun new features and a willingless to submit bug reports,
84 bool "Support vsyscall page"
85 depends on MMU && (CPU_SH3 || CPU_SH4)
88 This will enable support for the kernel mapping a vDSO page
89 in process space, and subsequently handing down the entry point
90 to the libc through the ELF auxiliary vector.
92 From the kernel side this is used for the signal trampoline.
93 For systems with an MMU that can afford to give up a page,
94 (the default value) say Y.
97 bool "Non Uniform Memory Access (NUMA) Support"
98 depends on MMU && SYS_SUPPORTS_NUMA && EXPERIMENTAL
101 Some SH systems have many various memories scattered around
102 the address space, each with varying latencies. This enables
103 support for these blocks by binding them to nodes and allowing
104 memory policies to be used for prioritizing and controlling
105 allocation behaviour.
109 default "3" if CPU_SUBTYPE_SHX3
111 depends on NEED_MULTIPLE_NODES
113 config ARCH_FLATMEM_ENABLE
117 config ARCH_SPARSEMEM_ENABLE
119 select SPARSEMEM_STATIC
121 config ARCH_SPARSEMEM_DEFAULT
124 config MAX_ACTIVE_REGIONS
126 default "6" if (CPU_SUBTYPE_SHX3 && SPARSEMEM)
127 default "2" if SPARSEMEM && (CPU_SUBTYPE_SH7722 || \
131 config ARCH_POPULATES_NODE_MAP
134 config ARCH_SELECT_MEMORY_MODEL
137 config ARCH_ENABLE_MEMORY_HOTPLUG
141 config ARCH_MEMORY_PROBE
143 depends on MEMORY_HOTPLUG
146 prompt "Kernel page size"
147 default PAGE_SIZE_8KB if X2TLB
148 default PAGE_SIZE_4KB
154 This is the default page size used by all SuperH CPUs.
160 This enables 8kB pages as supported by SH-X2 and later MMUs.
162 config PAGE_SIZE_64KB
164 depends on CPU_SH4 || CPU_SH5
166 This enables support for 64kB pages, possible on all SH-4
172 prompt "HugeTLB page size"
173 depends on HUGETLB_PAGE && (CPU_SH4 || CPU_SH5) && MMU
174 default HUGETLB_PAGE_SIZE_64K
176 config HUGETLB_PAGE_SIZE_64K
179 config HUGETLB_PAGE_SIZE_256K
183 config HUGETLB_PAGE_SIZE_1MB
186 config HUGETLB_PAGE_SIZE_4MB
190 config HUGETLB_PAGE_SIZE_64MB
194 config HUGETLB_PAGE_SIZE_512MB
204 menu "Cache configuration"
206 config SH7705_CACHE_32KB
207 bool "Enable 32KB cache size for SH7705"
208 depends on CPU_SUBTYPE_SH7705
211 config SH_DIRECT_MAPPED
212 bool "Use direct-mapped caching"
215 Selecting this option will configure the caches to be direct-mapped,
216 even if the cache supports a 2 or 4-way mode. This is useful primarily
217 for debugging on platforms with 2 and 4-way caches (SH7750R/SH7751R,
218 SH4-202, SH4-501, etc.)
220 Turn this option off for platforms that do not have a direct-mapped
221 cache, and you have no need to run the caches in such a configuration.
225 default CACHE_WRITEBACK if CPU_SH2A || CPU_SH3 || CPU_SH4 || CPU_SH5
226 default CACHE_WRITETHROUGH if (CPU_SH2 && !CPU_SH2A)
228 config CACHE_WRITEBACK
230 depends on CPU_SH2A || CPU_SH3 || CPU_SH4 || CPU_SH5
232 config CACHE_WRITETHROUGH
235 Selecting this option will configure the caches in write-through
236 mode, as opposed to the default write-back configuration.
238 Since there's sill some aliasing issues on SH-4, this option will
239 unfortunately still require the majority of flushing functions to
240 be implemented to deal with aliasing.