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

[Stefan Roese]

Hi Po-Yu Chuang,

On Friday 03 July 2009 11:11:55 Po-Yu Chuang wrote:
> > Yes, I understand your problem and it needs to get fixed. But your
> > original patch changed the unlock address not only for this "legacy"
> > FLASH type but for all AMD type FLASH chips. And I'm not sure if this is
> > correct. Meaning if the AMD/Spansion chips will accept these unlock
> > addresses.
> >
> > Perhaps you could check some data-sheets (some older and more recent
> > Spansion CFI chips) which unlock addresses should be used here.
>
> After checked the data sheets of jedec flash currently supported in u-boot
> -
>
> SST 39LF020
> AMD AM29LV040B
> SST 39LF040
> ST Micro M29W040B
> AMD AM29LV400BB
> AMD AM29LV800BB
>
> I found that the addresses to program a word of these chips are
> related to 0 (not sector base).
>
> And in flash_erase() in drivers/mtd/cfi_flash.c
>
> 			case CFI_CMDSET_AMD_STANDARD:
> 			case CFI_CMDSET_AMD_EXTENDED:
> 				flash_unlock_seq (info, sect);
> 				flash_write_cmd (info, sect,
> 						info->addr_unlock1,
> 						AMD_CMD_ERASE_START);
> 				flash_unlock_seq (info, sect);
> 				flash_write_cmd (info, sect, 0,
> 						 AMD_CMD_ERASE_SECTOR);
> 				break;
> #ifdef CONFIG_FLASH_CFI_LEGACY
> 			case CFI_CMDSET_AMD_LEGACY:
> 				flash_unlock_seq (info, 0);
> 				flash_write_cmd (info, 0, info->addr_unlock1,
> 						AMD_CMD_ERASE_START);
> 				flash_unlock_seq (info, 0);
> 				flash_write_cmd (info, sect, 0,
> 						AMD_CMD_ERASE_SECTOR);
> 				break;
> #endif
>
> It look like CFI_CMDSET_AMD_LEGACY use base 0
> CFI_CMDSET_AMD_STANDARD and CFI_CMDSET_AMD_EXTENDED use sector base
> for erase.
>
> It probably is the same case while programing a word.
>
> The following patch might be feasible.
> However, I don't have those chips for testing.

I don't have those chips either, but your patch below looks like an 
improvement to me. So I suggest that we push this patch into mainline so that 
other users with such chips can easily test it.

Could you please sent the patch below as a proper patch with a description 
your s-o-b line again to the list?

Thanks.

Best regards,
Stefan

> regards,
> Po-Yu Chuang
>
> ---
>  drivers/mtd/cfi_flash.c |   11 ++++++++---
>  1 files changed, 8 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/mtd/cfi_flash.c b/drivers/mtd/cfi_flash.c
> index d0732f5..81ac5d3 100644
> --- a/drivers/mtd/cfi_flash.c
> +++ b/drivers/mtd/cfi_flash.c
> @@ -835,14 +835,19 @@ static int flash_write_cfiword (flash_info_t *
> info, ulong dest,
>  		break;
>  	case CFI_CMDSET_AMD_EXTENDED:
>  	case CFI_CMDSET_AMD_STANDARD:
> -#ifdef CONFIG_FLASH_CFI_LEGACY
> -	case CFI_CMDSET_AMD_LEGACY:
> -#endif
>  		sect = find_sector(info, dest);
>  		flash_unlock_seq (info, sect);
>  		flash_write_cmd (info, sect, info->addr_unlock1, AMD_CMD_WRITE);
>  		sect_found = 1;
>  		break;
> +#ifdef CONFIG_FLASH_CFI_LEGACY
> +	case CFI_CMDSET_AMD_LEGACY:
> +		sect = find_sector(info, dest);
> +		flash_unlock_seq (info, 0);
> +		flash_write_cmd (info, 0, info->addr_unlock1, AMD_CMD_WRITE);
> +		sect_found = 1;
> +		break;
> +#endif
>  	}
>
>  	switch (info->portwidth) {

Viele Grüße,
Stefan

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