From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stefan Roese <sr@denx.de>
Date: Wed, 28 Nov 2007 07:23:14 +0100
Subject: [U-Boot-Users] Problem using cfi_flash driver for s29GL512N
	flashes
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	<200711270711.28519.sr@denx.de>
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Hi Santi Gopal,

On Tuesday 27 November 2007, Santigopal Mondal wrote:
>  Thanks for your help. The same problem remains with the upgraded version
> also.
>
>  Is it something to do with the TEXT_BASE. The probelm is the data for
> environment is written to flash properly. But when it checks for crc in
> env_init() the crc32 function fails. the env_ptr->crc is correct.
>
>  The environment sector when allocated in malloc area in main memory seems
> to get corrupted because the crc field does not seem to be correct.
>
>
>  the Ram is 32 MB
>  TEXT_BASE 21F00000
>  CFG_GBL_DATA_SIZE 128
>  CFG_ENV_ADDR (CFG_FLASH_BASE + 0x20000)
>  CFG_ENV_SIZE 0x2000
>  CFG_ENV_SECT_SIZE 0x20000
>  CONFIG_STACKSIZE (32 * 1024)
>  CFG_MALLOC_LEN (CFG_ENV_SIZE + 128*1024)

Here the CFI settings I currently use on some AMCC eval boards like
sequoia.h:

#define CFG_FLASH_BASE          0xfc000000      /* start of FLASH       */
#define CFG_MONITOR_LEN         (384 * 1024)    /* Reserve 384 kB for Monitor   */

/*-----------------------------------------------------------------------
 * 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_PROTECTION    1       /* use hardware flash protection        */

#define CFG_FLASH_EMPTY_INFO            /* print 'E' for empty sector on flinfo */

#ifdef CFG_ENV_IS_IN_FLASH
#define CFG_ENV_SECT_SIZE       0x20000 /* size of one complete sector          */
#define CFG_ENV_ADDR            ((-CFG_MONITOR_LEN)-CFG_ENV_SECT_SIZE)
#define CFG_ENV_SIZE            0x2000  /* Total Size of Environment Sector     */

/* Address and size of Redundant Environment Sector     */
#define CFG_ENV_ADDR_REDUND     (CFG_ENV_ADDR-CFG_ENV_SECT_SIZE)
#define CFG_ENV_SIZE_REDUND     (CFG_ENV_SIZE)
#endif

Please note that on these PPC4xx platforms, U-Boot is located at the *end*
of the FLASH, since the reset vector has to be at 0xfffffffc. So with an
U-Boot image size of 0x60000 the location is 0xfffa0000...0xffffffff.

Best regards,
Stefan

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