masayuki2009 opened a new pull request #16: feature k210
URL: https://github.com/apache/incubator-nuttx/pull/16
 
 
   **Summary**
   
   - Added initial support for Sipeed Maix Bit board with Kendryte K210 
processor.
   - K210 has two RV64GC cores but in this PR only the primary core is enabled.
   
   **Impact**
     
   - Some common files for RISC-V have been modified to support RV64GC.
   -   I also checked this PR with my SparkFun RED-V Plus which has SiFive 
FE310 core (RV32IMAC)
   
   **Limitations / TODO**
   
   - Because this is a initial porting some drivers such as GPIO/I2C/SPI are 
missing.
   - Also, nuttx (elf file) must be loaded with openocd-k210.
   
    These limitations and TODO are described in README.txt under the board 
directory.
   
   **Testing**
   
   - I confirmed that ostest passed. Also, basic commands such as 
uname/ps/free/sleep work as well.

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