zyfeier opened a new pull request, #8876:
URL: https://github.com/apache/nuttx/pull/8876

   ## Summary
   
   1.  When there has no mmu, the cache size will fail to be obtained. 
Therefore, the initial cache size is set the first time up_get_dcache_linesize 
is called.
   2.  Add cache enable and disable interface.
   3.  Add ARM64_DCACHE_DISABLE and ARM64_DCACHE_DISABLE feature for debug.
   
   ## Impact
   
   Cache
   
   ## Testing
   
   fvp-armv8r:nsh fvp-armv8r:nsh_smp qemu-armv8a-nsh qemu-armv8a-nsh_smp


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