[U-Boot] [U-BOOT] cfi_flash.c fails to program NOR Flash SST39LF040

[Stefan Roese <sr@denx.de>]

On Friday 24 April 2009, Po-Yu Chuang wrote:
> I have a board on which there is a NOR Flash SST39LF040.
>
> Previously, I copied flash.c from other boards.
>
> Now I am trying to migrate NOR Flash driver to use CFI, but it fails
> to program sectors which
> are not on the 0x10000 boundaries.
>
> I found that in function flash_write_cfiword()
> @drivers/mtd/cfi_flash.c it issues command
> with address relative to sector address.
> However, according to SST39 series data sheet, it seems that we should
> issue command
> with address relative to flash base address?
>
> After I modified flash_write_cfiword() to issue command to sector 0,
> everything works fine.
>
> Is it a bug?

Did you define CONFIG_FLASH_CFI_LEGACY (and CONFIG_SYS_FLASH_LEGACY_512Kx8)? 
IIRC then the SST FLASH chips are not completely CFI compatible. So you need 
to enable the JEDEC framework.

Best regards,
Stefan

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