From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 23509 invoked by alias); 3 Jul 2005 17:08:51 -0000 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 Received: (qmail 23498 invoked by uid 22791); 3 Jul 2005 17:08:46 -0000 Received: from smtpr6.alphanetworks.com (HELO smtpr6.alphanetworks.com) (210.202.42.130) by sourceware.org (qpsmtpd/0.30-dev) with ESMTP; Sun, 03 Jul 2005 17:08:46 +0000 Received: from stevencheng ([10.50.71.1]) by smtpr6.alphanetworks.com (Lotus Domino Release 6.5) with SMTP id 2005070401084003-4906 ; Mon, 4 Jul 2005 01:08:40 +0800 Message-ID: <000101c57ff2$07c6cf10$016ffea9@stevencheng> From: "Steven_cheng" <05071@alphanetworks.com> To: "Andrew Lunn" Cc: References: <01df01c57e22$1291cca0$016ffea9@stevencheng> <20050701124913.GK5563@lunn.ch> Date: Sun, 03 Jul 2005 17:08:00 -0000 MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="ISO-8859-1" Subject: Re: [ECOS] What is the different between "ROM" and "ROMRAM" in the Bootup type ?? X-SW-Source: 2005-07/txt/msg00030.txt.bz2 Dear Andrew, Thank you for you reply, but I still confuse about the following questions. 1) When the board powers on, does the CPU need to know which type and vendor of ROM flash?? (ex. AMD 29LV040B) 2) How does the CPU know the memory address which the ROM locates ?? because the files (xxx_romram.ldi/xxx_romram.h) only define the RAM address and size. Thnak you very much. // Steven ----- Original Message ----- From: "Andrew Lunn" To: "Steven_cheng" <05071@alphanetworks.com> Cc: Sent: Friday, July 01, 2005 8:49 PM Subject: Re: [ECOS] What is the different between "ROM" and "ROMRAM" in the Bootup type ?? > On Fri, Jul 01, 2005 at 05:48:45PM +0800, Steven_cheng wrote: > > Hi All, > > > > What is the different between "ROM" and "ROMRAM" in the Bootup type ?? > > > > Reference to the description of the configure tool : > > > > This option is used to control where the application program will run, > > either from RAM or ROM (flash) memory. ROM based applications must be self > > contained, while RAM applications will typically assume the existence of a > > debug environment, such as GDB stubs. > > > > > > > > But What is the different between "ROM" and "ROMRAM" ?? > > ROMRAM starts in ROM, but copies itself into RAM. > > Andrew > > -- > Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos > and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss > -- Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss