From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?utf-8?B?aGFja2x1LnVib290?= Date: Fri, 15 Apr 2011 17:15:28 +0800 Subject: [U-Boot] =?utf-8?q?is_any_bug_in_cp=3F?= References: , <201104151401034442433@gmail.com>, <20110415084445.A7470151F83@gemini.denx.de> Message-ID: <201104151715238470584@gmail.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de em.. how linux does that? does linux read the data to mem first before it write to the same bank of a nor flash? thanks much~ ------------------ hacklu.uboot 2011-04-15 ------------------------------------------------------------- ????????????Wolfgang Denk ???????????????2011-04-15 16:44:47 ????????????hacklu.uboot ?????????u-boot ?????????Re: [U-Boot] is any bug in cp? Dear "hacklu.uboot", In message <201104151401034442433@gmail.com> you wrote: > > there is some bugs when I cp to flash like this: > cp.b addr1 addr2 0x100 > > when the two addr in the same bank of a flash. it go wrongs > > finally the date of addr2 is 0x8080808080... > > cp to another bank of flash is work correctly. > cp from mem to flash or from flash to mem also correctly. You cannot copy directly within the same bank of NOR flash. While in programming mod, you cannot read any user data from that device. This is a "feature" of how NOR flash works and no bug in the code. Just don't do it. Best regards, Wolfgang Denk -- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de There are two ways of constructing a software design. One way is to make it so simple that there are obviously no deficiencies and the other is to make it so complicated that there are no obvious defi- ciencies. - Charles Anthony Richard Hoare