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-Disabling I-cache:
-- Set CONFIG_SYS_ICACHE_OFF
-
-Disabling D-cache:
-- Set CONFIG_SYS_DCACHE_OFF
-
-Enabling I-cache:
-- Make sure CONFIG_SYS_ICACHE_OFF is not set and call icache_enable().
-
-Enabling D-cache:
-- Make sure CONFIG_SYS_DCACHE_OFF is not set and call dcache_enable().
-
-Enabling Caches at System Startup:
-- Implement enable_caches() for your platform and enable the I-cache and
-  D-cache from this function. This function is called immediately
-  after relocation.
-
-Guidelines for Working with D-cache:
-
-Memory to Peripheral DMA:
-- Flush the buffer after the MPU writes the data and before the DMA is
-  initiated.
-
-Peripheral to Memory DMA:
-- Invalidate the buffer before starting the DMA. In case there are any dirty
-  lines from the DMA buffer in the cache, subsequent cache-line replacements
-  may corrupt the buffer in memory while the DMA is still going on. Cache-line
-  replacement can happen if the CPU tries to bring some other memory locations
-  into the cache while the DMA is going on.
-- Invalidate the buffer after the DMA is complete and before the MPU reads
-  it. This may be needed in addition to the invalidation before the DMA
-  mentioned above, because in some processors memory contents can spontaneously
-  come to the cache due to speculative memory access by the CPU. If this
-  happens with the DMA buffer while DMA is going on we have a coherency problem.
-
-Buffer Requirements:
-- Any buffer that is invalidated(that is, typically the peripheral to
-  memory DMA buffer) should be aligned to cache-line boundary both at
-  at the beginning and at the end of the buffer.
-- If the buffer is not cache-line aligned invalidation will be restricted
-  to the aligned part. That is, one cache-line at the respective boundary
-  may be left out while doing invalidation.
-- A suitable buffer can be alloced on the stack using the
-  ALLOC_CACHE_ALIGN_BUFFER macro.
-
-Cleanup Before Linux:
-- cleanup_before_linux() should flush the D-cache, invalidate I-cache, and
-  disable MMU and caches.
-- The following sequence is advisable while disabling d-cache:
-  1. disable_dcache() - flushes and disables d-cache
-  2. invalidate_dcache_all() - invalid any entry that came to the cache
-	in the short period after the cache was flushed but before the
-	cache got disabled.