[U-Boot-Users] STM flash support

[U-Boot-Users] STM flash support

[Ganesh Ragavan]

We recently moved to STM flash memory for one of our boards.  The flash we
are using is M29W128FH.  I don't see any support for this flash in the
~/include/flash.h file in the U-boot source tree.  Could someone please let
me know how I could add support for this flash in U-boot ?
Thanks,
Ganesh*

*
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[U-Boot-Users] STM flash support

[Stefan Roese]

On Tuesday 12 June 2007, Ganesh Ragavan wrote:
> We recently moved to STM flash memory for one of our boards.  The flash we
> are using is M29W128FH.  I don't see any support for this flash in the
> ~/include/flash.h file in the U-boot source tree.  Could someone please let
> me know how I could add support for this flash in U-boot ?

Looks like the FLASH mentioned above is CFI compatible (as most newer NOR 
FLASH's are). So the common CFI FLASH driver should be able to deal with this 
FLASH without any problems. No changes needed to the source code. Just use 
the common CFi driver.

Best regards,
Stefan

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[U-Boot-Users] STM flash support

[Tolunay Orkun]

Ganesh Ragavan wrote:
>
> We recently moved to STM flash memory for one of our boards.  The 
> flash we are using is M29W128FH.  I don't see any support for this 
> flash in the ~/include/flash.h file in the U-boot source tree.  Could 
> someone please let me know how I could add support for this flash in 
> U-boot ?
>
Please try cfi_flash.c driver. Your flash is a CFI flash (AFAIK) and 
does not need a #define macro when using cfi_flash.c driver.

Tolunay

[U-Boot-Users] STM flash support

[Ganesh Ragavan]

Thanks Stefan and Tolunay for the response.  The U-Boot version we are using
is 1.0.0, which does not have the file cfi_flash.c that you mentioned.  We
don't want to upgrade the version.  To explain the problem in more detail:


We have the following code segment in  *flash_get_size* method of *flash.c*file.


*case (FLASH_WORD_SIZE)AMD_ID_MIRROR:
     value2 = addr2[0x0e];
     value3 = addr2[0x0f];
#ifdef DEBUG
  printf ("flash value2 = 0x%x\n",value2);
  printf ("flash value3 = 0x%x\n",value3);
#endif
  if (value2 == (FLASH_WORD_SIZE)AMD_ID_LV128U_2
  &&  value3 == (FLASH_WORD_SIZE)AMD_ID_LV128U_3)
  {
   info->flash_id += FLASH_AMLV128U;
   info->sector_count = 256;
   info->size = 0x01000000;
  }
  else  {
   info->flash_id = FLASH_UNKNOWN;
   return (0);   /* => no or unknown flash */
  }
  break;*



This was the code segmented that got executed with our old AMD flash.  The
new ST flash has a different value for value3 parameter above.  As a result
I need to add another if condition something like below:

*  if (value2 == (FLASH_WORD_SIZE)AMD_ID_LV128U_2
  &&  value3 == (FLASH_WORD_SIZE)ST_ID_..........._3)
  {
   info->flash_id += XXXXXXXXX;
   info->sector_count = 256;
   info->size = 0x01000000;
  }*


I was wondering what the value of *XXXXXXXXX** *should be?

Thanks,
Ganesh






On 6/12/07, Tolunay Orkun <listmember@orkun.us> wrote:
>
> Ganesh Ragavan wrote:
> >
> > We recently moved to STM flash memory for one of our boards.  The
> > flash we are using is M29W128FH.  I don't see any support for this
> > flash in the ~/include/flash.h file in the U-boot source tree.  Could
> > someone please let me know how I could add support for this flash in
> > U-boot ?
> >
> Please try cfi_flash.c driver. Your flash is a CFI flash (AFAIK) and
> does not need a #define macro when using cfi_flash.c driver.
>
> Tolunay
>
>
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[U-Boot-Users] STM flash support

[Tolunay Orkun]

First, never ever post HTML messages to the list. The mail format for 
this list is plain text.

Ganesh Ragavan wrote:
> Thanks Stefan and Tolunay for the response.  The U-Boot version we are 
> using is 1.0.0, which does not have the file cfi_flash.c that you 
> mentioned.  We don't want to upgrade the version.

cfi_flash.c is in drivers directory. If you are not using cfi_flash.c 
you are using a board custom flash driver.. There are/were a lot of 
flash.c drivers in the past but many boards are now using cfi_flash 
driver. You will have to support your own board custom driver yourself.

If your board is in public repository latest U-Boot version might be 
already using cfi_flash driver.

Finally, U-Boot 1.0.0 is very old. There has been various bugs fixed. 
You should use latest code from git repository.

Tolunay