Date: Tue, 15 Mar 2011 14:41:09 -0400 From: Andrew Duane <aduane@juniper.net> To: Marcel Moolenaar <xcllnt@mac.com>, Aleksandr Rybalko <ray@dlink.ua> Cc: "freebsd-current@freebsd.org" <freebsd-current@freebsd.org>, "freebsd-embedded@freebsd.org" <freebsd-embedded@freebsd.org> Subject: RE: [CFT][patch]cfi driver support for NOR flash arrays Message-ID: <AC6674AB7BC78549BB231821ABF7A9AE9DC0E6867E@EMBX01-WF.jnpr.net> In-Reply-To: <F9D2993A-F90E-403F-B2E6-01B5BA5C42D9@mac.com> References: <20110314170942.90bfb5a8.ray@dlink.ua> <F9D2993A-F90E-403F-B2E6-01B5BA5C42D9@mac.com>
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Marcel Moolenaar wrote: > On Mar 14, 2011, at 8:09 AM, Aleksandr Rybalko wrote: >=20 >> Hi, all. >>=20 >> proposed patch add support of NOR flash arrays to cfi driver >> http://my.ddteam.net/files/2011-03-11_cfi_flash_array_support.patch >=20 > Hi Aleksandr, >=20 > The patch is interesting, but combines a whole bunch of different > changes. Some of the changes are similar to the fixes we have at > Juniper ourselves, so getting the driver sync'd up is a good idea. > Not to mention that we have added support for the SPI interface. >=20 > Just a quick question: is an array different from 2 independent > CFI devices on the same bus? I mean: can we support an array by > having 2 driver instances? >=20 > Thanks, Arrays can be horizontal or vertical. A vertical array is just two chips, 0= ->XXXXX and XXXXX+1->YYYYYY. This would work with 2 driver instances. Horizontal (interleaved) is two chips that share a single address space and= provide alternating bits/bytes/words. This would not work with two instanc= es. -- Andrew Duane Juniper Networks 978-589-0551 10 Technology Park Dr aduane@juniper.net Westford, MA 01886-3418 =20
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