thanks , I have understanded.
------------------ hacklu.uboot 2011-04-18
------------------------------------------------------------- 发件人：Wolfgang Denk 发送日期：2011-04-15 18:21:23 收件人：hacklu.uboot 抄送：u-boot 主题：Re:Re: Re: [U-Boot] is any bug in cp?
Dear "=?utf-8?B?aGFja2x1LnVib290?=",
In message 201104151715238470584@gmail.com you wrote:
em.. how linux does that?
What exactly are you doing in Linux? Are we talking about user-space access through a file sytem (and thus block devices) based on the MTD layer? Or about raw access to the flash devices? Or about in-kernel code directly accessing some CFI driver routines?
does linux read the data to mem first before it write to the same bank of a nor flash?
For user space operations on file system level: yes.
Best regards,
Wolfgang Denk