[U-Boot] Query: Does Uboot support CFI flash driver forM29W128GH

[Stefan Roese]

Hi Prakash,

On Thursday 29 October 2009 07:24:25 prakash bedge wrote:
> Can you please send me the patch details to fixup the CFI query related bug
> for M29W128GH?

I did send you the patch in my last mail. You just need to add this code to a
board specific file, e.g. board/board_name/board_name.c.
 
> In the code for each header file there is a macro named
> CONFIG_FLASH_CFI_DRIVER defined in each board specific header file in
>  folder /include/configs. But I am not seeing any #ifdef for this macro in
>  code. Where this macro is being checked in the code?

It's in the makefile (drivers/mdt/Makefile).
 
> Is there any documentation giving details on how the CFI flash
> driver executes in U-Boot?

It's really simple, just copy the config options and change some
values like CONFIG_SYS_FLASH_BANKS_LIST, CONFIG_SYS_MAX_FLASH_BANKS
according to your hardware specs. Take a look at zeus for example:

#define CONFIG_SYS_FLASH_CFI				/* The flash is CFI compatible	*/
#define CONFIG_FLASH_CFI_DRIVER			/* Use common CFI driver	*/

#define CONFIG_SYS_FLASH_BANKS_LIST	{ CONFIG_SYS_FLASH_BASE }

#define CONFIG_SYS_MAX_FLASH_BANKS	1	/* max number of memory banks		*/
#define CONFIG_SYS_MAX_FLASH_SECT	512	/* max number of sectors on one chip	*/

#define CONFIG_SYS_FLASH_ERASE_TOUT	120000	/* Timeout for Flash Erase (in ms)	*/
#define CONFIG_SYS_FLASH_WRITE_TOUT	500	/* Timeout for Flash Write (in ms)	*/

#define CONFIG_SYS_FLASH_USE_BUFFER_WRITE 1	/* use buffered writes (20x faster)	*/
#define CONFIG_SYS_FLASH_PROTECTION	1	/* use hardware flash protection	*/

#define CONFIG_SYS_FLASH_EMPTY_INFO		/* print 'E' for empty sector on flinfo */
#define CONFIG_SYS_FLASH_QUIET_TEST	1	/* don't warn upon unknown flash	*/

This shouldn't be too hard.

Cheers,
Stefan

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