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

[Peter Pearse]

I have a patch in the pipeline such that all ARM supplied development boards
will use CFI flash.

Peter

> -----Original Message-----
> From: Stefan Roese [mailto:sr at denx.de] 
> Sent: 25 May 2007 08:29
> To: u-boot-users at lists.sourceforge.net
> Cc: Josef Meser; Peter Pearse
> Subject: Re: [U-Boot-Users] [PATCH] ARM Versatile PB926EJ-S, 
> Rev.D: Added support for flash 28F256L30B
> 
> 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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