[U-Boot-Users] Cannot erase flash sector

[Joe Culler]

On 3/24/06, Wolfgang Denk wrote:
>  you wrote:
> >
> > I have a question about erasing flash sectors, please tell me what
> > steps I did wrong,
> ...
> > If I want to erase sector from 20020000 to 20090000 for example, I use
>
> I'm not sure if you mean what you say. For me, this sounds as if  you
> ant  to  erase  the area up to (and probably NOT including) 20090000,
> but ...
>
> > "erase 20020000 2009ffff" to erase flash, it seems to be ok from erase mess=
>
> This obviously  erases  the  next  sector,  too,  i.  e.  far  beyond
> 20090000.

Thank you very much for your quick reply :-)
 You're right, I should erase to 20090000.

> > But when I use "flinfo" command to see whether those sectors are
> > erased or not, it shows
> > the same above message:
> > Bank # 1: SGS Thomson PSD4256G (1 M, uniform sector)
> >   Size: 1 MB in 16 Sectors
> >   Sector Start Addresses:
> >     20000000 (RO) 20010000 (RO) 20020000      20030000      20040000
> >     20050000      20060000      20070000      20080000      20090000
> >     200A0000 E    200B0000 E    200C0000 E    200D0000 E    200E0000 E
> >     200F0000 (RO)
> >
> > If I understand correct, sectors from 20020000 to 20090000 should be
> > displayed (E),
> > but those aren't. I don't know what step I did wrong.
>
> Use "md" to verify if the sectors have been erased. If they are, then
> check why you get a bad display; if they are  not  erased,  fix  your
> flash driver.

After using "md", I see my linux kernel is loaded. As you mentioned, I should
fix my flash driver. My flash driver is based on board/atc/flash.c, I
think the problem
is the function flash_erase(). Since I'm not an expert, would you give
me some hints?
Thanks in advance.

> Can you use the CFI-driver?

Yes, I'll use that, thanks. Besides, I noticed if I use u-boot 1.1.3,
the boot prompt
display:

 U-Boot 1.1.3 (Mar 24 2006 - 01:59:06)

U-Boot code: A3F00000 -> A3F2252C BSS: -> A3F5738C
RAM Configuration:
Bank #0: a0000000 64 MB
Flash: 2 MB

If I use git to download u-boot current source code, the boot prompt display:

U-Boot 1.1.4 (Mar 24 2006 - 02:32:06)

DRAM: 64 MB
Flash: 2 MB

I copy the same board/ and my board.h into current source code. Is that normal
output? Thanks again.

> Best regards,
>
> Wolfgang Denk
>
> --
> Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
> Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
> Our universe is a fragile house of atoms, held together by the mortar
> of cause-and-effect. One magician would be two too many.
>                         - Terry Pratchett, _The Dark Side of the Sun_

Best regards,
Joe.