masayuki2009 opened a new pull request #5633:
URL: https://github.com/apache/incubator-nuttx/pull/5633
## Summary
- This PR contains the following 2 commits
- commit1: arch: imx6: Refactor imx_lowputc()
- Remove '\n' -> '\r\n' conversion
- Remove waiting for FIFO empty after sending a character
- Remove CONFIG_DEBUG_FEATURES
- commit2: Remove sem_t from imx_serial.c
- I noticed that when exiting getprime, DEBUGASSERT happens in
nxsem_wait()
- Finally, I found that up_putc() uses nxsem_wait()
- This commit fixes this issue by removing the semaphore.
- Also, up_putc() now calls imx_lowputc()
## Impact
- None
## Testing
- Tested with sabre-6quad:netknsh (not merged yet)
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