From mboxrd@z Thu Jan 1 00:00:00 1970 To: laurent.pinchart@capflow.com Cc: linuxppc-embedded@lists.linuxppc.org Subject: Re: Embedded MPC860T & flash memory From: Wolfgang Denk Mime-version: 1.0 Content-type: text/plain; charset=ISO-8859-1 In-reply-to: Your message of "Fri, 22 Feb 2002 15:26:00 +0100." <3C7654F8.3010801@capflow.com> Date: Fri, 22 Feb 2002 16:16:48 +0100 Message-Id: <20020222151653.25BED109E2@denx.denx.de> Sender: owner-linuxppc-embedded@lists.linuxppc.org List-Id: Dear Laurent, in message <3C7654F8.3010801@capflow.com> you wrote: > > As I need to be able to write to the memory using the MTD layer, I was > wondering if it would be better to use 2 16-bit wide chips in > interleaved mode on a 32-bit bus (connecting them in parallel to the > bus, one of them storing D[0:15] and the other one D[16:31]), or to use > them in non-interleaved mode (non-overlapping address ranges) on a > 16-bit bus. It seems that the Linux MTD layer can support both > configurations, but I don't have a deep knowledge of that code, and thus > would appreciate any advice. For the software it does not matter - both configurations will work. For the performance it makes a BIG difference. Go for a buswidth of 32 bits, i. e. use 2 chips in 16 bit mode in parallel. Wolfgang Denk -- Software Engineering: Embedded and Realtime Systems, Embedded Linux Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd@denx.de "The trouble with doing something right the first time is that nobody appreciates how difficult it was." - Walt West ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/