[U-Boot] [PATCH] Fix CFI flash driver for 8-bit bus support

[Stefan Roese]

Hi Aaron,

On Tuesday 12 April 2011 09:46:22 Aaron Williams wrote:
> I believe this is correct.

Hmmm, I'm still not convinced about this reset call in the erase function. Do 
you really need it for the CFI driver to work correctly on your board? Could 
you please test without this reset command?

> I have redone the patch as two patches. The
> first patch fixes the 8-bit addressing and has been tested with both 8 and
> 16-bit support with Spansion. The second patch adds a 1us delay after
> every reset call. In my email correspondence with Spansion they said that
> at least some devices require a 500ns delay after the reset command.

Thanks. The only real concern I still have is the new reset command as 
mentioned above. Please either explain why it is needed, or remove it from 
your patch. I'll push the patches upstream once this issue is resolved.

<snip>
 
> > > @@ -1043,6 +1049,8 @@ int flash_erase (flash_info_t * info, int
> > > s_first, int s_last) int prot;
> > > 
> > >  	flash_sect_t sect;
> > >  	int st;
> > > 
> > > +
> > > +	debug("%s: erasing sectors %d to %d\n", __func__, s_first, s_last);
> > > 
> > >  	if (info->flash_id != FLASH_MAN_CFI) {
> > >  	
> > >  		puts ("Can't erase unknown flash type - aborted\n");
> > > 
> > > @@ -1082,6 +1090,7 @@ int flash_erase (flash_info_t * info, int
> > > s_first, int s_last) break;
> > > 
> > >  			case CFI_CMDSET_AMD_STANDARD:
> > > 
> > >  			case CFI_CMDSET_AMD_EXTENDED:
> > > +				flash_write_cmd (info, 0, 0, AMD_CMD_RESET);
> > 
> > Is this correct? A reset command in every flash_erase() call?
> > 
> > Thanks.
> > 
> > Cheers,
> > Stefan

Cheers,
Stefan

--
DENX Software Engineering GmbH,      MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich,  Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-0 Fax: (+49)-8142-66989-80 Email: office at denx.de