From owner-freebsd-hackers Sat May 6 18:03:14 1995 Return-Path: hackers-owner Received: (from majordom@localhost) by freefall.cdrom.com (8.6.10/8.6.6) id SAA26857 for hackers-outgoing; Sat, 6 May 1995 18:03:14 -0700 Received: from ref.tfs.com (ref.tfs.com [140.145.254.251]) by freefall.cdrom.com (8.6.10/8.6.6) with ESMTP id SAA26851 for ; Sat, 6 May 1995 18:03:12 -0700 Received: (from julian@localhost) by ref.tfs.com (8.6.8/8.6.6) id SAA07877; Sat, 6 May 1995 18:03:06 -0700 From: Julian Elischer Message-Id: <199505070103.SAA07877@ref.tfs.com> Subject: Re: lance Ethernet and > 16 Mb RAM failure To: mtaylor@gateway.cybernet.com (Mark J. Taylor) Date: Sat, 6 May 1995 18:03:05 -0700 (PDT) Cc: hackers@FreeBSD.org In-Reply-To: from "Mark J. Taylor" at May 6, 95 07:44:38 pm Content-Type: text Content-Length: 802 Sender: hackers-owner@FreeBSD.org Precedence: bulk > > Hi- > > I'm installing 2.0-950412-SNAP on a new system. I've never used the 'lnc' > ethernet drivers before, and I'm having difficulty getting them stable on a > system with more than 16 Mb of RAM. > looks as if the bounce buffer code in the dma using routines for non master dma, is broken, OR maybe they are not using it correctly.... It sould use it's DMA in much the same way as the floppy driver does, so that it can guarantee that the DMA will go to a buffer < 16MB but this may not be the case.. (the floppy uses a low dma channel and the enet uses a high channel so the floppy is doesn things in bytes where the enet will do things in 'words' but still it should do the same logical thing..... if you compare the two and find that they are NOT.. then that's your problem julian