From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 11864 invoked by alias); 30 Oct 2003 07:54:40 -0000 Mailing-List: contact ecos-discuss-help@sources.redhat.com; run by ezmlm Precedence: bulk List-Subscribe: List-Archive: List-Post: List-Help: , Sender: ecos-discuss-owner@sources.redhat.com Received: (qmail 11857 invoked from network); 30 Oct 2003 07:54:39 -0000 Received: from unknown (HELO sierra.silicomp.fr) (194.51.78.35) by sources.redhat.com with SMTP; 30 Oct 2003 07:54:39 -0000 Received: from mishima.ri.silicomp.fr ([172.16.80.179]) by sierra.silicomp.fr (8.12.10/8.12.6) with SMTP id h9U7r8Bl000620 for ; Thu, 30 Oct 2003 08:53:08 +0100 Date: Thu, 30 Oct 2003 07:54:00 -0000 From: Laurent GONZALEZ To: ecos-discuss@sources.redhat.com Message-Id: <20031030090031.2e3825f7.laurent.gonzalez@ri.silicomp.fr> In-Reply-To: <3FA005C0.7070804@rawbw.com> References: <3FA005C0.7070804@rawbw.com> Organization: SILICOMP RESEARCH INSTITUTE Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.21 (www . roaringpenguin . com / mimedefang) Subject: Re: [ECOS] Ethernet driver question X-SW-Source: 2003-10/txt/msg00499.txt.bz2 On Wed, 29 Oct 2003 10:24:00 -0800 John Newlin wrote: > Couple of silly questions, I like multiple choice: > > 1) When the HDWR_Send function is called, is there: > a) a valid FCS already at the end of the data? > b) 4 bytes where the FCS should be, but expects the hardware to > change > it on the way out > c) No FCS, expects the hardware to append an FCS > > (Our hardware can generate an FCS, so would save some cycles if the > FCS were not generated in software) > > 2) When HDWR_recv is called to get a packet, does it expect a valid > enet frame including MAC address, and FCS on the end, or does it want > those stripped off? I imagine the former is correct, but I just want > to make sure. > > > Thanks, > > -John Newlin > > hello, AFAIK, 1) c) No FCS, expects the hardware to append an FCS 2) expect a valid enet frame including MAC address any FCS computation are reserved for the hardware layer. regards, -- GONZALEZ Laurent Silicomp Research Institute Tel: 04 76 41 66 98 -- Before posting, please read the FAQ: http://sources.redhat.com/fom/ecos and search the list archive: http://sources.redhat.com/ml/ecos-discuss