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puc - PCI “Universal” Communications driver
This driver acts as a shim to connect PCI serial and parallel ports to
the sio(4) and ppc(4) driver.
The list of supported devices is in sys/dev/puc/pucdata.c. Support for
new cards should be added there.
If the PUC_FASTINTR option is used, the driver will try to use fast
interrupts. This should lower the interrupt latency and should be used
if the sio(4) driver reports silo overflow errors. It cannot be used if
the interrupt is shared.
This driver took the idea from the NetBSD puc(4) driver and still uses
the same structure to describe cards, to ease exchanging card info.
Only serial ports are supported through the sio(4) driver at the moment.