[U-Boot-Users] [PATCH] ARM Versatile PB926EJ-S, Rev.D: Added support for flash 28F256L30B

[Stefan Roese]

On Friday 25 May 2007, Josef Meser wrote:
> > One question: Why can't you use the common CFI driver on this board?
>
> I have to admit that I am not familiar with the CFI driver. I made the
> patch for u-boot-1.1.5 which we used up to now. There it makes a
>
> []> make versatile_config
> []> make all
>
> work on the new HW. Rev.D.
>
> As i did not find the new type of flash in the current source tree,
> I submitted my changes. This changes are minimal (in terms of size
> and function) for me, which does not mean that they are optimal
> for someone who is more into u-boot.

The common CFI flash driver (drivers/cfi_flash.c) is designed to
function with all CFI compatible flash's. The new flash you added
is a CFI compatible flash. The question remains, what are the "old"
flash's used on the board before? Do you have an old board to test
the CFI driver on both board revisions?

Integrating the CFI driver is quite easy: You have to change your
board config file to something like this:

/*-----------------------------------------------------------------------
 * FLASH related
 *----------------------------------------------------------------------*/
#define CFG_FLASH_CFI                   /* The flash is CFI compatible  */
#define CFG_FLASH_CFI_DRIVER            /* Use common CFI driver        */

#define CFG_FLASH_BANKS_LIST    {CFG_FLASH_BASE}
#define CFG_MAX_FLASH_BANKS     1       /* max number of memory banks           */
#define CFG_MAX_FLASH_SECT      512     /* max number of sectors on one chip    */

#define CFG_FLASH_ERASE_TOUT    120000  /* Timeout for Flash Erase (in ms)      */
#define CFG_FLASH_WRITE_TOUT    500     /* Timeout for Flash Write (in ms)      */

#define CFG_FLASH_USE_BUFFER_WRITE 1    /* use buffered writes (20x faster)     */
#define CFG_FLASH_EMPTY_INFO            /* print 'E' for empty sector on flinfo */


This has to be adjusted of course, if you need to support more than
one flash chip (two or more banks).

And you need to disable the board specific flash driver completely from
your board Makefile.

Please give it a try and let me know if your have any further questions.

Best regards,
Stefan

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