hi scott: thank you for replying. because i am not familiar with the framework of uboot's nand driver ,do you think i should read all of the source code about the nand driver? BTW,i have not found the diretory "drivers/mtd/nand/fsl_elbc.c",is it the latest version? best regards. ?> -----原始邮件----- > 发件人: "Scott Wood" <[email protected]> > 发送时间: 2009年5月30日 星期六 > 收件人: lanmanck <[email protected]> > 抄送: [email protected] > 主题: Re: [U-Boot] hi,guys,about the nand flash driver > > On Fri, May 29, 2009 at 12:49:52PM +0800, lanmanck wrote: > > hi: > > i am going to port uboot1.1.6 nand flash driver to my arm926ejs board.use > > /drivers/nand/nand.c. not nand_legacy.c . > > out cpu chip has a nand flash controller,the program flow is as below: > > As Wolfgang pointed out, that is very old. Please use current code. > > > 1、set address to controller's register > > 2、set command to controller's register > > 3、write controller's special register,so that the 2 steps above can execute. > > 4、wait for the steps above to be completed ,through another register. > > 5、now program the data. > > the problem is; > > i don't konw how to set struct nand_chip's func point because of the nand > > controller: > > xxx_hwcontrol(): the ale,cle cannot be controlled by program. > > IO_ADDRW:what's it? > > now i think i just need to write the fllowing functions: > > wirtebyte,readbyte,writebuf,readbuf, > > That will not be sufficient. If your NAND controller does not fit in the > cmd_ctrl model, then you'll have to override higher level functions such > as cmdfunc -- see drivers/mtd/nand/fsl_elbc.c for an example. > > Alternatively, you may want to override the higher level functions that > call cmdfunc. > > -Scott
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