raiden00pl opened a new pull request, #20099:
URL: https://github.com/apache/nuttx/pull/20099
## Summary
- drivers/serial: sample xmit.head once per iteration in uart_xmitchars()
- drivers/serial: read the consumer index once in uart_recvchars()
taken from #20030
## Impact
required for SMP intel64 to pass LPT tests
## Testing
The producer is pinned to CPU1 while the 16550 TX interrupt runs on CPU0,
so every wrap of the 16-byte ring races uart_xmitchars(). The host then checks
that tx.bin is exactly the first 2000000 bytes of the repeated alphabet
"abcdefghijklmnopqrstuvwxyz".
Before (serial_io.c from parent commit):
217615369 bytes captured, 217540918 of them NUL; first mismatch at
offset 55952 ("...stuvwxyz" followed by an endless 0x00 flood).
After (this branch):
2000000 bytes captured, 0 NUL, stream byte-exact.
Only the TX fix is exercised. The RX batch path in uart_recvchars() needs a
driver with recvbuf which is not supported for qemu-intel64 serial port.
CI pass for intel64:
https://github.com/apache/nuttx/actions/runs/34236734404/job/102183306099?pr=20030
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