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 depends on MMU && EXPERIMENTAL && (CPU_SUBTYPE_SH7780 || CPU_SUBTYPE_SH7785)
66 If you say Y here, physical addressing will be extended to
67 32-bits through the SH-4A PMB. If this is not set, legacy
68 29-bit physical addressing will be used.
71 bool "Enable extended TLB mode"
72 depends on (CPU_SHX2 || CPU_SHX3) && MMU && EXPERIMENTAL
74 Selecting this option will enable the extended mode of the SH-X2
75 TLB. For legacy SH-X behaviour and interoperability, say N. For
76 all of the fun new features and a willingless to submit bug reports,
80 bool "Support vsyscall page"
81 depends on MMU && (CPU_SH3 || CPU_SH4)
84 This will enable support for the kernel mapping a vDSO page
85 in process space, and subsequently handing down the entry point
86 to the libc through the ELF auxiliary vector.
88 From the kernel side this is used for the signal trampoline.
89 For systems with an MMU that can afford to give up a page,
90 (the default value) say Y.
93 bool "Non Uniform Memory Access (NUMA) Support"
94 depends on MMU && SYS_SUPPORTS_NUMA && EXPERIMENTAL
97 Some SH systems have many various memories scattered around
98 the address space, each with varying latencies. This enables
99 support for these blocks by binding them to nodes and allowing
100 memory policies to be used for prioritizing and controlling
101 allocation behaviour.
105 default "3" if CPU_SUBTYPE_SHX3
107 depends on NEED_MULTIPLE_NODES
109 config ARCH_FLATMEM_ENABLE
113 config ARCH_SPARSEMEM_ENABLE
115 select SPARSEMEM_STATIC
117 config ARCH_SPARSEMEM_DEFAULT
120 config MAX_ACTIVE_REGIONS
122 default "6" if (CPU_SUBTYPE_SHX3 && SPARSEMEM)
123 default "2" if SPARSEMEM && (CPU_SUBTYPE_SH7722 || \
127 config ARCH_POPULATES_NODE_MAP
130 config ARCH_SELECT_MEMORY_MODEL
133 config ARCH_ENABLE_MEMORY_HOTPLUG
137 config ARCH_MEMORY_PROBE
139 depends on MEMORY_HOTPLUG
142 prompt "Kernel page size"
143 default PAGE_SIZE_8KB if X2TLB
144 default PAGE_SIZE_4KB
148 depends on !MMU || !X2TLB
150 This is the default page size used by all SuperH CPUs.
154 depends on !MMU || X2TLB
156 This enables 8kB pages as supported by SH-X2 and later MMUs.
158 config PAGE_SIZE_16KB
162 This enables 16kB pages on MMU-less SH systems.
164 config PAGE_SIZE_64KB
166 depends on !MMU || CPU_SH4 || CPU_SH5
168 This enables support for 64kB pages, possible on all SH-4
175 default "0x00001000" if PAGE_SIZE_4KB
176 default "0x00002000" if PAGE_SIZE_8KB
177 default "0x00004000" if PAGE_SIZE_16KB
178 default "0x00010000" if PAGE_SIZE_64KB
182 prompt "HugeTLB page size"
183 depends on HUGETLB_PAGE && (CPU_SH4 || CPU_SH5) && MMU
184 default HUGETLB_PAGE_SIZE_1MB if PAGE_SIZE_64KB
185 default HUGETLB_PAGE_SIZE_64K
187 config HUGETLB_PAGE_SIZE_64K
189 depends on !PAGE_SIZE_64KB
191 config HUGETLB_PAGE_SIZE_256K
195 config HUGETLB_PAGE_SIZE_1MB
198 config HUGETLB_PAGE_SIZE_4MB
202 config HUGETLB_PAGE_SIZE_64MB
206 config HUGETLB_PAGE_SIZE_512MB
216 menu "Cache configuration"
218 config SH7705_CACHE_32KB
219 bool "Enable 32KB cache size for SH7705"
220 depends on CPU_SUBTYPE_SH7705
223 config SH_DIRECT_MAPPED
224 bool "Use direct-mapped caching"
227 Selecting this option will configure the caches to be direct-mapped,
228 even if the cache supports a 2 or 4-way mode. This is useful primarily
229 for debugging on platforms with 2 and 4-way caches (SH7750R/SH7751R,
230 SH4-202, SH4-501, etc.)
232 Turn this option off for platforms that do not have a direct-mapped
233 cache, and you have no need to run the caches in such a configuration.
237 default CACHE_WRITEBACK if CPU_SH2A || CPU_SH3 || CPU_SH4 || CPU_SH5
238 default CACHE_WRITETHROUGH if (CPU_SH2 && !CPU_SH2A)
240 config CACHE_WRITEBACK
243 config CACHE_WRITETHROUGH
246 Selecting this option will configure the caches in write-through
247 mode, as opposed to the default write-back configuration.
249 Since there's sill some aliasing issues on SH-4, this option will
250 unfortunately still require the majority of flushing functions to
251 be implemented to deal with aliasing.