[U-Boot-Users] flash memory access

[Paul McAvoy <paulmcav@queda.net>]

I'm sorry.  I am confused here.

When I boot the board, I am told by the ROM boot monitor (as well as specs for
the board) that there is 32MBytes of flash memory.

I am unable to determine anything about the flash configuration from the
documentation I get from Arm's website.  So, looking at the board, I found an
atmel chip, The actual chip number is:

 AT49LV040
   90JC
   0152

I am really sorry about this confusion.  It is entirely my fault!  After
realizing my mistake, I took another look at the board, and found the actual
flash chip with 32Megs available.  It is a Sharp LHF32K01.

This is my first foray into working with non x86 hardware.  All my previous
experience with hardware has been in a non-programming role as well.  I am
also working on this project solo.   So I apologize for sending out confusing
messages.   Feel free to just respond with 'you are a donkeys rear' in the
future if necessary.

Thanks for your time.

- Paul

On Sun, Mar 02, 2003 at 10:38:06AM +0100, Wolfgang Denk wrote:
> In message <000901c2e058$c149ac50$1400a8c0@bodhi> you wrote:
> > I was using the reference of 256 * 128K sectors from some other demo sorce
> > code that came with the board.  But after looking at the datasheet for the
> > device:
> > http://www.atmel.com/dyn/products/product_card.asp?family_id=624&family_name
> > =Flash+Memory&part_id=1761
> 
> Aaaaargghhhh!!
> 
> You started asking about  "an  Atmel  chip,  32Megbyts,  256  *  128K
> sectors"  (your own words, includinh the typo). You did not bother to
> list the exact type, so we could only guess from the  parameters  you
> quoted. Of course I assumed these were at least correct!
> 
> > There is no mention of any sectors on the chip, and the only way to
> > re-program it (apparently) is to re-flash the entire thing.
> 
> I don't know how you manage to do this, but ALL of  your  information
> is wrong.
> 
> The chip is neiter 32 Megabytes, nor 32 Megabits, but 512 k x 8 (512k
> Bytes, 4096 Mbit).
> 
> The chips has neither 256 * 128K sectors  (those  would  have  to  be
> virtual  sectors  anyway  :-),  but  your  statement  that  you  have
> "re-flash the entire thing" is wrong either - it  is  a  Bottom  Boot
> type with a dedicated 16 kB boot sector.
> 
> I am a bit surprised to see this chip in any  current  design,  so  I
> would  not be surprised if in you rnext message you will tell us that
> it is some other chip in fact.
> 
> You know, I understand when people post vague questions about  things
> they  cannot  understand;  but looking up a chip type and reading its
> spec is pretty straightforward, and  you  are  expected  to  do  your
> homework.  Instead, you wasted my time.
> 
> 
> 
> Wolfgang Denk
> 
> -- 
> Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
> Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
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> 
>