zhuyanlinzyl commented on a change in pull request #5441:
URL: https://github.com/apache/incubator-nuttx/pull/5441#discussion_r802366053
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File path: arch/arm/src/armv7-a/arm_cache.c
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@@ -190,7 +198,15 @@ void up_clean_dcache_all(void)
void up_flush_dcache(uintptr_t start, uintptr_t end)
{
- cp15_flush_dcache(start, end);
+ if (cp15_cache_size() < (end - start))
Review comment:
We have a testing on armv8-m with 32K icache & 32k dcache, when flush
&clean buffer with size 1MB。
up_clean_dcache_all() run 30 times faster than up_clean_dcache().
When use this patch, the time is same.
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