Date: Wed, 26 May 2004 00:49:15 +0800 From: "Morton Lin" <mtlin1@ms36.hinet.net> To: "Olivier Houchard" <cognet@ci0.org>, "Philip Blundell" <pb@nexus.co.uk> Cc: freebsd-arm@freebsd.org Subject: Re: I want to buy an ARM dev. board Message-ID: <002301c44278$3f3eb740$c50a27ca@p3bf> References: <003301c4420c$3391f220$4455608c@11091019701> <1085489504.31926.2.camel@mill.nexus.co.uk> <20040525130914.GA9944@ci0.org>
index | next in thread | previous in thread | raw e-mail
> On Tue, May 25, 2004 at 01:51:44PM +0100, Philip Blundell wrote: > > On Tue, 2004-05-25 at 04:55, Morton Lin wrote: > > > I found an ARM (ARM940T core) evaluation board : ATB-2510. > > > ( http://www.vitals.co.kr/Eng/product/t-board/tb_2510.htm ) > > > It had many features such as MiniPCI, PCMCIA, USB and so forth. > > > I thought it will be a good development environment for FreeBSD/ARM. > > > > If I recall correctly, ARM940T doesn't have an MMU, only an MPU. That > > core would not be a good choice for running FreeBSD. > > Oh yeah it's a problem :-) > > Olivier > Sure, ARM940T only had Memory Protection Unit, also {I | D}-cache. But I thought it can have some similar capabilities like an MCU which had MMU. (Of course, for FreeBSD/ARM, it's a lot of work / re-write to achieve that) IMHO, in modern embedded market, there were many MMUless MCUs used in valuable field. Even those MCUs which had MMU, the EmbeddedOS/RTOS went along with, didn't use their MMU functions. For example, uCLinux. There're cost and budget issues behind this situation. In low end application I think the 32bits MCU like the ARM7/9 series will be the main stream. In high end field, I think the Intel XScale (w/ MMU) will be the star. So, are we going to have two directions for the FreeBSD/ARM ? Is it possible ? Can anyone tell us how much effort do we need to take and how difficult if we want to port FreeBSD/ARM to a MMUless core/platform ? Or we just move toward the Intel XScale architecture ? Just my NTD $0.2 and sorry for the poor English. Best regards, Morton Lin. (It's midnight here, Taiwan, do we need to send soldier to Iraq !? :-P )help
Want to link to this message? Use this
URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?002301c44278$3f3eb740$c50a27ca>