[U-Boot-Users] include/flash.h: Entries for Spansion S29JL064H flash?

[U-Boot-Users] include/flash.h: Entries for Spansion S29JL064H flash?

[Joseph]

Hi, 

I am new to U-Boot. 
[Yes... I have been reading the documentation, albeit slowly. There is
much to learn.]

I need to modify include/flash.h to support Spansion S29JL064H flash
memory

        http://www.spansion.com/products/S29JL064H.html


A search through previous postings to this list did not reveal
appropriate values for

        * Device ID

        * Internal FLASH identification code

[Do I need one or the other or both?]

This chip may be a the replacement for an earlier AMD chip, 29DL640D. I
am not sure.


Suggestions?


-Joseph
-- 
joseph_sacco [at] comcast [dot] net

[U-Boot-Users] include/flash.h: Entries for Spansion S29JL064H flash?

[Ben Warren]

Hi Joseph,

Joseph E. Sacco, Ph.D. wrote:
> Hi, 
>
> I am new to U-Boot. 
> [Yes... I have been reading the documentation, albeit slowly. There is
> much to learn.]
>
> I need to modify include/flash.h to support Spansion S29JL064H flash
> memory
>
>         http://www.spansion.com/products/S29JL064H.html
>
>
> A search through previous postings to this list did not reveal
> appropriate values for
>
>         * Device ID
>
>         * Internal FLASH identification code
>
> [Do I need one or the other or both?]
>   
This chip is CFI compliant. CFI stands for 'Common Flash Interface', and 
means that software can learn the chip's topology via a standard query 
method. In short, you shouldn't need to do anything with flash.h, all 
you need to do is specify in your board's /include/configs/*.h file that 
your board uses CFI. Lots of other boards use it, so look through the 
source to figure out the exact syntax.

regards,
Ben

[U-Boot-Users] include/flash.h: Entries for Spansion S29JL064H flash?

[Joseph Sacco]

On Thu, 2007-10-18 at 10:00 -0400, Ben Warren wrote:
> Hi Joseph,
>
> Joseph E. Sacco, Ph.D. wrote:
> > Hi,
> >
> > I am new to U-Boot.
> > [Yes... I have been reading the documentation, albeit slowly. There is
> > much to learn.]
> >
> > I need to modify include/flash.h to support Spansion S29JL064H flash
> > memory
> >
> >         http://www.spansion.com/products/S29JL064H.html
> >
> >
> > A search through previous postings to this list did not reveal
> > appropriate values for
> >
> >         * Device ID
> >
> >         * Internal FLASH identification code
> >
> > [Do I need one or the other or both?]
> >
> This chip is CFI compliant. CFI stands for 'Common Flash Interface', and
> means that software can learn the chip's topology via a standard query
> method. In short, you shouldn't need to do anything with flash.h, all
> you need to do is specify in your board's /include/configs/*.h file that
> your board uses CFI. Lots of other boards use it, so look through the
> source to figure out the exact syntax.
>
> regards,
> Ben

===========================================================================
Ben,

Thanks for responding.   I will poke through the source to find the
corrrect syntax, which is a great way to learn about  u-boot.  A simple
grep for CFI offers up some perspective candidates to explore.

FWIW... I am working on a board with
* (1) MPC8270
* (2) 16MB SDRAM [32MB: 4M x 64]
* (2) 8 MB flash chips [16MB: 4M x 32]
* (1) LXT972A PHY [connected to FCC1]

I "inherited" an implementation of u-boot for this board based upon a
pre-release, CVS version of u-boot-1.0.2.  This implementation hacked
the existing files for the MPC8260ADS board rather than creating a new
board type. Some of the generic u-boot files were also hacked to support
the specific processor version and flash type.

 I am slowly working through each hack  in an attempt to understand what
was done and why.  My goal is to define a new board type and then port
the results  to u-boot-1.2.0.  Creating a new board type within the
existing code base was a simple matter of renaming some files and
tweaking a few others.  Porting the results to u-boot-1.2.0 will be more
challenging.  The Fun begins...

Be well,

-Joseph



-- 
drjesacco [at] gmail [dot] com
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