linguini1 opened a new pull request, #16443:
URL: https://github.com/apache/nuttx/pull/16443

   ## Summary
   
   This PR adds support for a NSH configuration on the Elegoo ATMega2560 Rev3 
board.
   
   ## Impact
   
   Users with this board will be able to use NuttX on it.
   
   This impacts the build system by adding a new board (some new configuration 
options added), the documentation system and adds a new board under the 
``avr/atmega`` grouping.
   
   ## Testing
   
   Documentation was tested with local build and verification of render in 
browser.
   
   `autoled` implementation was tested by enabling the subsystem and calling 
`board_autoled_on(LED_STARTED)` in the ``atmega_boardinitialize()`` function, 
verifying that the LED turned on.
   
   The NSH application could not be tested as of right now. It appears the UART 
driver for the ATMega2560 is not working correctly. No data appears on USART0 
after booting, even with syslog enabled. When I manually call ``avr_lowputc`` 
in the ``atmega_boardinitialize()`` function, the TX LED on the board gets 
stuck on.
   
   Since this board is a "clone" of the Arduino ATMega2560 board, I also 
flashed the ``hello`` configuration from that board and experienced the same 
lack of data on USART0. If there is anyone with an ATMega2560 based board who 
might be able to confirm this issue, please let me know!


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