From owner-freebsd-hardware Thu Jul 18 20:09:46 1996 Return-Path: owner-hardware Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id UAA18814 for hardware-outgoing; Thu, 18 Jul 1996 20:09:46 -0700 (PDT) Received: from godzilla.zeta.org.au (godzilla.zeta.org.au [203.2.228.19]) by freefall.freebsd.org (8.7.5/8.7.3) with SMTP id UAA18776 for ; Thu, 18 Jul 1996 20:09:24 -0700 (PDT) Received: (from bde@localhost) by godzilla.zeta.org.au (8.6.12/8.6.9) id MAA30468; Fri, 19 Jul 1996 12:54:02 +1000 Date: Fri, 19 Jul 1996 12:54:02 +1000 From: Bruce Evans Message-Id: <199607190254.MAA30468@godzilla.zeta.org.au> To: E00114@vnet.atea.be, freebsd-hardware@freebsd.org Subject: Re: Multiple COM ports with same IRQ Sender: owner-hardware@freebsd.org X-Loop: FreeBSD.org Precedence: bulk >Considering the UARTS will generate edge interrupt rather than level, will >this work? Will sio grab the "dual port" interrupt then interrogate the >individual status regs of the UARTS? I'm not too concerned with operation >under DOS here, so I'm only concerned with FBSD. 16550 UARTs just generate signals that should work with either level or edge sensitive schemes. If the interrupts are still edge sensitive from the 8259 PIC's point of view, then they can't be shared. Bruce