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 prompt "PMB handling type"
77 depends on MMU && EXPERIMENTAL && (CPU_SUBTYPE_SH7780 || CPU_SUBTYPE_SH7785)
80 If you say Y here, physical addressing will be extended to
81 32-bits through the SH-4A PMB. If this is not set, legacy
82 29-bit physical addressing will be used.
86 depends on MMU && EXPERIMENTAL && (CPU_SUBTYPE_SH7780 || \
90 If this option is enabled, fixed PMB mappings are inherited
91 from the boot loader, and the kernel does not attempt dynamic
92 management. This is the closest to legacy 29-bit physical mode,
93 and allows systems to support up to 512MiB of system memory.
98 bool "Enable extended TLB mode"
99 depends on (CPU_SHX2 || CPU_SHX3) && MMU && EXPERIMENTAL
101 Selecting this option will enable the extended mode of the SH-X2
102 TLB. For legacy SH-X behaviour and interoperability, say N. For
103 all of the fun new features and a willingless to submit bug reports,
107 bool "Support vsyscall page"
108 depends on MMU && (CPU_SH3 || CPU_SH4)
111 This will enable support for the kernel mapping a vDSO page
112 in process space, and subsequently handing down the entry point
113 to the libc through the ELF auxiliary vector.
115 From the kernel side this is used for the signal trampoline.
116 For systems with an MMU that can afford to give up a page,
117 (the default value) say Y.
120 bool "Non Uniform Memory Access (NUMA) Support"
121 depends on MMU && SYS_SUPPORTS_NUMA && EXPERIMENTAL
124 Some SH systems have many various memories scattered around
125 the address space, each with varying latencies. This enables
126 support for these blocks by binding them to nodes and allowing
127 memory policies to be used for prioritizing and controlling
128 allocation behaviour.
132 default "3" if CPU_SUBTYPE_SHX3
134 depends on NEED_MULTIPLE_NODES
136 config ARCH_FLATMEM_ENABLE
140 config ARCH_SPARSEMEM_ENABLE
142 select SPARSEMEM_STATIC
144 config ARCH_SPARSEMEM_DEFAULT
147 config MAX_ACTIVE_REGIONS
149 default "6" if (CPU_SUBTYPE_SHX3 && SPARSEMEM)
150 default "2" if SPARSEMEM && (CPU_SUBTYPE_SH7722 || \
154 config ARCH_POPULATES_NODE_MAP
157 config ARCH_SELECT_MEMORY_MODEL
160 config ARCH_ENABLE_MEMORY_HOTPLUG
162 depends on SPARSEMEM && MMU
164 config ARCH_ENABLE_MEMORY_HOTREMOVE
166 depends on SPARSEMEM && MMU
168 config ARCH_MEMORY_PROBE
170 depends on MEMORY_HOTPLUG
173 prompt "Kernel page size"
174 default PAGE_SIZE_8KB if X2TLB
175 default PAGE_SIZE_4KB
179 depends on !MMU || !X2TLB
181 This is the default page size used by all SuperH CPUs.
185 depends on !MMU || X2TLB
187 This enables 8kB pages as supported by SH-X2 and later MMUs.
189 config PAGE_SIZE_16KB
193 This enables 16kB pages on MMU-less SH systems.
195 config PAGE_SIZE_64KB
197 depends on !MMU || CPU_SH4 || CPU_SH5
199 This enables support for 64kB pages, possible on all SH-4
206 default "0x00001000" if PAGE_SIZE_4KB
207 default "0x00002000" if PAGE_SIZE_8KB
208 default "0x00004000" if PAGE_SIZE_16KB
209 default "0x00010000" if PAGE_SIZE_64KB
213 prompt "HugeTLB page size"
214 depends on HUGETLB_PAGE && (CPU_SH4 || CPU_SH5) && MMU
215 default HUGETLB_PAGE_SIZE_1MB if PAGE_SIZE_64KB
216 default HUGETLB_PAGE_SIZE_64K
218 config HUGETLB_PAGE_SIZE_64K
220 depends on !PAGE_SIZE_64KB
222 config HUGETLB_PAGE_SIZE_256K
226 config HUGETLB_PAGE_SIZE_1MB
229 config HUGETLB_PAGE_SIZE_4MB
233 config HUGETLB_PAGE_SIZE_64MB
237 config HUGETLB_PAGE_SIZE_512MB
247 menu "Cache configuration"
249 config SH7705_CACHE_32KB
250 bool "Enable 32KB cache size for SH7705"
251 depends on CPU_SUBTYPE_SH7705
254 config SH_DIRECT_MAPPED
255 bool "Use direct-mapped caching"
258 Selecting this option will configure the caches to be direct-mapped,
259 even if the cache supports a 2 or 4-way mode. This is useful primarily
260 for debugging on platforms with 2 and 4-way caches (SH7750R/SH7751R,
261 SH4-202, SH4-501, etc.)
263 Turn this option off for platforms that do not have a direct-mapped
264 cache, and you have no need to run the caches in such a configuration.
268 default CACHE_WRITEBACK if CPU_SH2A || CPU_SH3 || CPU_SH4 || CPU_SH5
269 default CACHE_WRITETHROUGH if (CPU_SH2 && !CPU_SH2A)
271 config CACHE_WRITEBACK
274 config CACHE_WRITETHROUGH
277 Selecting this option will configure the caches in write-through
278 mode, as opposed to the default write-back configuration.
280 Since there's sill some aliasing issues on SH-4, this option will
281 unfortunately still require the majority of flushing functions to
282 be implemented to deal with aliasing.