[U-Boot-Users] Re: Problem with the cfi flash driver with a x8/x16 flash configuredinx8 mode.

Txema Lopez tlopez at aotek.es
Thu Jan 12 17:42:57 CET 2006

Alex BASTOS wrote:

Thanks Alex,

>>Does anybody test the cfi  flash driver (cfi_flash.c) with a  x8/x16
>>flash configured in x8 mode ? I'm trying to port U-Boot for a Lite5200B
>>with a S29GL128N flash (CFI compliant) using the cfi flash driver.
>>U-Boot detects the flash correctly but It's unable to erase or write the
>>flash. In my case the following patch fix the bug but I'm not completly
>>sure If It's only a bug with my configuration. Any suggestions? Could
>>anybody test the patch in other architecture?
>I think your topic is very similar to this recent one:
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?

>So, yes, til now cfi_flash didn't support x8 mode for AMD chips,
>but it will.
>Best regards,
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.

--- ../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

Best regards,
Jose Maria Lopez.
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