xiaoxiang781216 opened a new pull request, #8843:
URL: https://github.com/apache/nuttx/pull/8843

   ## Summary
   
   CONFIG_SERIAL_TERMIOS only decide whether to support c_cflag field since 
many terminal application need the first three fields to work correctly. For 
more information please reference:
   https://www.mail-archive.com/[email protected]/msg09321.html
   
   before this change(olimexino-stm32:tiny):
   ```
      text    data     bss     dec     hex filename
     34884     328    1768   36980    9074 nuttx
   ```
   after this change:
   ```
      text    data     bss     dec     hex filename
     35052     340    1768   37160    9128 nuttx
   ```
   delta
   ```
      text    data     bss     dec     hex filename
       168      12       0     180      b4 nuttx
   ```
   
   ## Impact
   
   Terminal special process expected by application always exist
   
   ## Testing
   
   sim:adb


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