2 # MN10300 CPU cache options
6 prompt "CPU Caching mode"
7 default MN10300_CACHE_WBACK
9 This option determines the caching mode for the kernel.
11 Write-Back caching mode involves the all reads and writes causing
12 the affected cacheline to be read into the cache first before being
13 operated upon. Memory is not then updated by a write until the cache
14 is filled and a cacheline needs to be displaced from the cache to
15 make room. Only at that point is it written back.
17 Write-Through caching only fetches cachelines from memory on a
18 read. Writes always get written directly to memory. If the affected
19 cacheline is also in cache, it will be updated too.
21 The final option is to turn of caching entirely.
23 config MN10300_CACHE_WBACK
26 config MN10300_CACHE_WTHRU
29 config MN10300_CACHE_DISABLED
34 config MN10300_CACHE_ENABLED
35 def_bool y if !MN10300_CACHE_DISABLED
39 prompt "CPU cache flush/invalidate method"
40 default MN10300_CACHE_MANAGE_BY_TAG if !AM34_2
41 default MN10300_CACHE_MANAGE_BY_REG if AM34_2
42 depends on MN10300_CACHE_ENABLED
44 This determines the method by which CPU cache flushing and
45 invalidation is performed.
47 config MN10300_CACHE_MANAGE_BY_TAG
48 bool "Use the cache tag registers directly"
50 config MN10300_CACHE_MANAGE_BY_REG
51 bool "Flush areas by way of automatic purge registers (AM34 only)"
56 config MN10300_CACHE_INV_BY_TAG
57 def_bool y if MN10300_CACHE_MANAGE_BY_TAG && MN10300_CACHE_ENABLED
59 config MN10300_CACHE_INV_BY_REG
60 def_bool y if MN10300_CACHE_MANAGE_BY_REG && MN10300_CACHE_ENABLED
62 config MN10300_CACHE_FLUSH_BY_TAG
63 def_bool y if MN10300_CACHE_MANAGE_BY_TAG && MN10300_CACHE_WBACK
65 config MN10300_CACHE_FLUSH_BY_REG
66 def_bool y if MN10300_CACHE_MANAGE_BY_REG && MN10300_CACHE_WBACK