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Can FreeBSD handle multiport serial cards sharing irqs? Frequently Asked Questions for FreeBSD 2.X : Serial Communications : Can FreeBSD handle multiport serial cards sharing irqs?
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11.6. Can FreeBSD handle multiport serial cards sharing irqs?

Not yet. You'll have to use a different irq for each card.

Frequently Asked Questions for FreeBSD 2.X : Serial Communications : Can FreeBSD handle multiport serial cards sharing irqs?
Previous: How do I enable support for a multiport serial card?
Next: How can I set the default serial parameters for a port?