From mboxrd@z Thu Jan 1 00:00:00 1970 From: "David H. Lynch Jr." Subject: Re: [RFC][PATCH] Xilinx uartlite serial driver Date: Fri, 13 Oct 2006 10:12:04 -0400 Message-ID: <452F9EB4.3060801@dlasys.net> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from 24.152.213.223.res-cmts.eph.ptd.net ([24.152.213.223]:35482 "EHLO mx.dlasys.net") by vger.kernel.org with ESMTP id S1750725AbWJMOOi (ORCPT ); Fri, 13 Oct 2006 10:14:38 -0400 Received: from l-dhlii.dlasys.net ([206.223.20.247]:3710) by mx.dlasys.net with esmtpa (Exim 4.62 #1 (Debian)) id 1GYNfw-0002KZ-Pn by authid with plain_server for ; Fri, 13 Oct 2006 10:06:12 -0400 Sender: linux-serial-owner@vger.kernel.org List-Id: linux-serial@vger.kernel.org To: linux-serial@vger.kernel.org Peter Korsgaard wrote: >>>>>> "David" == David H Lynch writes: >>>>>> > > Hi, > > > David> Also there is no provision for running the UartLite without > David> using interrupts. The Pico E12/E14 frequently use FPGA > David> firmare that does not include a PIC. Some implimentations of > David> the UartLite use dcr instead of memory mapped ports. > > No - again like the early serial stuff that's something that can be > added once the base driver is mainlined if there's demand. > > Does polling even work decently with the small fifo size of the > uartlite? > > I do not care about DCR, but as the responsible party for the only board I am aware of that does use the uartlite as its primary serial device, which typically does not have interrupt support, that is something I care about alot. You can poll a serial port on an 8080 running 1Mhz with a serial port with no fifo. 16 bytes on a 300Mhz PPC is heaven. Works fine at 115K baud. -- Dave Lynch DLA Systems Software Development: Embedded Linux 717.627.3770 dhlii@dlasys.net http://www.dlasys.net fax: 1.253.369.9244 Cell: 1.717.587.7774 Over 25 years' experience in platforms, languages, and technologies too numerous to list. "Any intelligent fool can make things bigger and more complex... It takes a touch of genius - and a lot of courage to move in the opposite direction." Albert Einstein