[U-Boot-Users] Suggestion on flash init

[Wang Jian]

Hi Wolfgang Denk,


On Tue, 03 Jan 2006 15:08:42 +0100, Wolfgang Denk <wd at denx.de> wrote:

> In message <20060103205317.0711.LARK at linux.net.cn> you wrote:
> > 
> > In my situation, S29AL016M works in x8 mode, which has different command
> > sequence from in x16 mode.
> 
> If you look closer it is not so different at all.
> 
> > x16 mode sector erase
> > addr[0x555] = 0xAA;
> > addr[0x2AA] = 0x55;
> > addr[0x555] = 0x80;
> > addr[0x555] = 0xAA;
> > addr[0x2AA] = 0x55;
> > addr[0x000] = 0x30;
> ...
> > x8 mode sector erase
> > addr[0xAAA] = 0xAA;
> > addr[0x555] = 0x55;
> > addr[0xAAA] = 0x80;
> > addr[0xAAA] = 0xAA;
> > addr[0x555] = 0x55;
> > addr[0x000] = 0x30;
> 
> 0x555 = 0xAAA >> 1
> 0x2AA = 0x555 >> 1
> 
> > I have little knowledge about other flash chips, so it is not easy for
> > me to write clean patch for cfi_flash.c, although I want to.
> 
> The code is actually the very same,  just  taking  into  account  the
> different addressing mode.
> 

I am not sure if other kind of AMD flash chips use such x8/x16 command
sequence. I am afraid that I will fix one thing and break other things.


-- 
  lark