From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 1782 invoked by alias); 27 Aug 2008 07:20:19 -0000 Received: (qmail 1758 invoked by uid 22791); 27 Aug 2008 07:20:17 -0000 X-Spam-Check-By: sourceware.org Received: from d5152C2DE.access.telenet.be (HELO lx-dmz.televic.com) (81.82.194.222) by sourceware.org (qpsmtpd/0.31) with ESMTP; Wed, 27 Aug 2008 07:19:41 +0000 Received: (qmail 8933 invoked from network); 27 Aug 2008 07:19:38 -0000 Received: from nt-email.televic.com (10.0.0.9) by lx-dmz.televic.com with SMTP; 27 Aug 2008 07:19:38 -0000 Received: from [127.0.0.1] ([10.0.56.49]) by nt-email.TELEVIC.COM with Microsoft SMTPSVC(6.0.3790.1830); Wed, 27 Aug 2008 09:19:38 +0200 Message-ID: <48B5000A.40707@televic.com> Date: Wed, 27 Aug 2008 14:52:00 -0000 From: =?ISO-8859-2?Q?J=FCrgen_Lambrecht?= User-Agent: Thunderbird 2.0.0.16 (Windows/20080708) MIME-Version: 1.0 To: sebastian igielski CC: ecos-discuss@sourceware.org References: <48B42000.7000407@kolporter.com.pl> In-Reply-To: <48B42000.7000407@kolporter.com.pl> Content-Type: text/plain; charset=ISO-8859-2; format=flowed Content-Transfer-Encoding: 8bit X-IsSubscribed: yes Mailing-List: contact ecos-discuss-help@ecos.sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: ecos-discuss-owner@ecos.sourceware.org Subject: Re: [ECOS] Red-Boot & Multiple Flash IC's X-SW-Source: 2008-08/txt/msg00071.txt.bz2 sebastian igielski wrote: > Hi! > > We have porting Red-Boot to our platform based on EP9302 > microprocessor (produced by Cirrus Logic, ARM920T core inside). I have > one question about using multiple flash IC's connected to different > chip selects, uut at first I must tell something about our hardware > platform. > > In a few words, we have on board following IC's: > > 1x MCU: EP9302 (ARM920T core, 16 bit wide data bus) > 4x SDRAM (one SDRAM chip have 32Mbyte capacity, four banks - [8MBytes > per bank]) - Total: 128Mbytes of RAM > 2x NOR FLASH (JS28F1283D) (connected to two separate chip selects) > (The NOR flash chips is Intel-Strata FLASH IC's.) > > One NOR-FLASH chip have 16-bit data bus. The NOR-Flash chips is placed > at 0x6000_0000 and 0x7000_0000 in physical memory layout. After > configuring and enabling the MMU the NOR-Flash chips is mapped as > follows (virtual address space): > > IC #1: 0x6000_0000 - 0x60FF_FFFF > IC #2: 0x6100_0000 - 0x61FF_FFFF > > And now is my question about Red-Boot environment. It is possible to > (and how to do it) use both NOR flash chips? > Now I have working only one chip (placed at virtual address: > 0x6000_0000-0x60FF_FFFF). > > I have no idea how to tell Red-Boot/Strata Flash driver to see my > second NOR-Flash chip. It is possible to RedBoot handle this kind of > hardware configuration? > > Some people told me that I must modify the "CYGNUM_FLASH_DEVICES", but > in my humble opinion this variable defines the FLASH IC's needed to > coverage the data bus by multiple FLASH IC's (for example: when I have > 32 bit wide data bus, and when I have two 16 bit FLASH IC's to > coverage 32-bit data bus - in that case CYGNUM_FLASH_DEVICES must be > set to 2). I'm correct? i also think so > > In our hardware the data bus is 16-bit wide and FLASH IC is 16 bit > wide (so one flash chip coverage all data bus), the second FLASH IC is > used to extend size of flash memory size. As i written above, I have > working first FLASH CHIP. And I don't know to add second chip to > RedBoot environment. > > If anybody can suggest me right solution of my problem, or give any > helpful idea I will be graceful. > > I have ecos-2.0 package. you should take the latest version from cvs > > with regards > Sebastian Igielski > > I have 1 flash IC of 64 MB, by I can only access 16 MB per chip select, so I use 4 chip selects to acces my flash. This is transparant for redboot. Redboot only sees 1 chip. My arm7 has no MMU; the 4 address ranges nicely follow each other; you need to do a correct mapping of the address/data bus to your address range. I think to have 2 separate flash chips and 2 times mounting, you need the flash_v2 drivers (flash_v2 label in /io/flash). Success, Jürgen -- Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss