[U-Boot-Users] Re: Problem with the cfi flash driver with a x8/x16 flash confi guredinx8 mode.

[Bastos Fernandez Alexandre <ALEBAS@televes.com>]

Txema,

> >
> >I think your topic is very similar to this recent one:
> >
> >http://thread.gmane.org/gmane.comp.boot-loaders.u-boot/19970
> >
> >
> OK, I've checked it.
>
> >and previous similar patches have been submited and are still
> >pending (but it seems they are coming, read the whole thread)
> >
> >
> But not the patch that Wolfgang proposed, isn'it?
>

Wolfgang proposes shifting the commands as a solution. This is
the way it's done in some patches already submitted, (mine as
an example ;-D ) ...

http://sourceforge.net/mailarchive/message.php?msg_id=12799051

> I think the patch that Wolfgang proposed could be like that. I've tested
> it with a S29GL128N x8/x16 in x8 mode. It works fine. But I have no idea
> what would happen in  x16 mode or others modes. I haven't the hardware
> to check it.

I think this may work for x16 but would break support for x32, x64
as portwidth can be ...
FLASH_CFI_8BIT          0x01
FLASH_CFI_16BIT         0x02
FLASH_CFI_32BIT         0x04
FLASH_CFI_64BIT         0x08

but AMD_ADDR_* for x16, x32 and x64 is the same


>
> --- ../tmp/u-boot/drivers/cfi_flash.c   2006-01-12 12:22:08.000000000
+0100
> +++ drivers/cfi_flash.c 2006-01-12 17:21:19.000000000 +0100
> @@ -107,9 +107,10 @@
>
>  #define AMD_STATUS_TOGGLE              0x40
>  #define AMD_STATUS_ERROR               0x20
> -#define AMD_ADDR_ERASE_START           0x555
> -#define AMD_ADDR_START                 0x555
> -#define AMD_ADDR_ACK                   0x2AA
> +
> +#define AMD_ADDR_ERASE_START           (0xAAA >> (info->portwidth-1))
> +#define AMD_ADDR_START                 (0xAAA >> (info->portwidth-1))
> +#define AMD_ADDR_ACK                   (0x555 >> (info->portwidth-1))
>
>  #define FLASH_OFFSET_CFI               0x55
>  #define FLASH_OFFSET_CFI_RESP          0x10
>


Also, take a look a this pathc for buffer write support:

http://sourceforge.net/mailarchive/message.php?msg_id=12797909


Best regards,

Alex BASTOS