[U-Boot] Reply:Re: hi,guys,about the nand flash driver

[lanmanck]

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" <scottwood at freescale.com>
> 发送时间: 2009年5月30日 星期六
> 收件人: lanmanck <lanmanck at 163.com>
> 抄送: u-boot at lists.denx.de
> 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