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The ns8250 driver avoids clearing IER bit 0x10 to account for the split "receiver time-out interrupt enable" bit, but it never sets it in `ier_rxbits` even though a comment in `ns8250_init` implies so. Fix this by setting `IER_RXTMOUT` if we've matched an XScale uart. Differential Revision: https://reviews.freebsd.org/D57629 Reviewed by: imp MFC after: 2 weeks