From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 31477 invoked by alias); 11 Apr 2006 04:07:57 -0000 Received: (qmail 31463 invoked by uid 22791); 11 Apr 2006 04:07:53 -0000 X-Spam-Check-By: sourceware.org Received: from main.gmane.org (HELO ciao.gmane.org) (80.91.229.2) by sourceware.org (qpsmtpd/0.31) with ESMTP; Tue, 11 Apr 2006 04:07:49 +0000 Received: from list by ciao.gmane.org with local (Exim 4.43) id 1FTAAM-00088r-CV for ecos-discuss@sources.redhat.com; Tue, 11 Apr 2006 06:07:46 +0200 Received: from 87.236.81.130 ([87.236.81.130]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Tue, 11 Apr 2006 06:07:46 +0200 Received: from osv by 87.236.81.130 with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Tue, 11 Apr 2006 06:07:46 +0200 To: ecos-discuss@sources.redhat.com From: Sergei Organov Date: Tue, 11 Apr 2006 04:07:00 -0000 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 User-Agent: Gnus/5.110004 (No Gnus v0.4) XEmacs/21.4.18 (linux) X-IsSubscribed: yes Mailing-List: contact ecos-discuss-help@ecos.sourceware.org; run by ezmlm Precedence: bulk List-Subscribe: List-Archive: List-Post: List-Help: , Sender: ecos-discuss-owner@ecos.sourceware.org Subject: [ECOS] Re: DSR stops running after heavy interrupts. Spurious Interrupt! X-SW-Source: 2006-04/txt/msg00132.txt.bz2 "Joe Porthouse" writes: > Ok, found the source of the Spurious Interrupts, (your really going to love > this one). [...] > Clearing this interrupt occurs if you read from the Receiver FIFO, set the > FCR[RESETRF] bit or A NEW START BIT IS RECEIVED!!! > > So if the RX FIFO is below the trigger point and a timeout occurs an IRQ > request is generated, but if a new start bit is detected the IRQ request is > then immediately cleared. :( > > Wow an interrupt that can clear its own IRQ request before service occurs!!! > That would surely cause a Spurious Interrupt. Sounds like yet another piece of broken hardware design from Intel, -- they failed to deliver reasonable RS232 implementation at the early days of PC, and still fail to do it right in 20 years :( -- Sergei. -- Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss