hotislandn opened a new pull request, #6151:
URL: https://github.com/apache/incubator-nuttx/pull/6151

   This is the workaround for an RV64 SoC that does not has memory mapped regs 
of the MTIMER current value, what's more, it does not allow for writing MTIMER 
compare reg in 64bit mode. However, we do need to use the common RV64 MTIMER 
APIs, rather than write a new SoC-specific source with the most common codes 
within.
   
   ## Summary
   set the mtime address to -1 to indicate this special case.
   
   ## Impact
   All RV64 SoCs use common MTIMER APIs.
   
   ## Testing
   Tested on this RV64 SoC in our project: use the MTIMER as the OS tick.
   


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