| 1( INIT) | Diagnostics during card attach, detach and initialization. |
| 2( OPEN) | Diagnostics when opening a port. |
| 4( CLOSE) | Diagnostics when closing a port. |
| 8( SET) | Diagnostics when setting tty device flags. |
| 16( INT) | Diagnostics when processing card events. |
| 32( READ) | Reports return values from port reads. |
| 64( WRITE) | Reports return values from port writes. |
| 128( RX) | Reports receive queue flow control. |
| 256( TX) | Reports transmit queue flow control. |
| 512( IRQ) | Diagnostics during interrupts (enable these with care). |
| 1024( MODEM) | Diagnostics when setting modem status flags. |
| 2048( RI) | Reports when a RING is received. |
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