[U-Boot] M29EW flash is detected as 0xFF

[Jagan Teki]

On Wed, Feb 20, 2013 at 10:55 PM, Jagan Teki <jagannadh.teki at gmail.com> wrote:
> Hi Stefan,
>
> On Wed, Feb 20, 2013 at 7:27 PM, Stefan Roese <sr at denx.de> wrote:
>> On 18.02.2013 10:57, Jagan Teki wrote:
>>> I have a 16MB, M29EW flash on target boards.
>>>
>>> I got the below info, while probing the flash.
>>>
>>> Bank # 1: CFI conformant flash (8 x 8)  Size: 64 MB in 512 Sectors
>>>   AMD Standard command set, Manufacturer ID: 0xFF, Device ID: 0xFF
>>>   Erase timeout: 4096 ms, write timeout: 2 ms
>>>   Buffer write timeout: 5 ms, buffer size: 1024 bytes
>>>
>>> Since the Manu.ID of this flash is 0x89, it got detected as 0xFF.
>>>
>>> Does u-boot code have a support for M29EW flash..?
>>
>> I'm pretty sure, yes. Which U-Boot version are you using? Most likely
>> its an older version. Your problem reminds me about this commit:
>>
>> Author: Philippe De Muyter <phdm at macqel.be>  2010-08-10 16:54:52
>> Committer: Stefan Roese <sr at denx.de>  2010-08-18 09:09:00
>> Parent: 2e97394a6d07a36dfc139b7b98b12e452b5bd8dc (cfi_flash: flinfo:
>> allow user interrupt in flash print info fn)
>> Child:  70084df7125a0b67de707b999982ec67adfdc35c (cfi_flash: Cleanup
>> flash_print_info())
>> Branches: many (98)
>> Follows: v2010.06
>> Precedes: v2010.09-rc1
>>
>>     Fix printing & reading of 16-bit CFI device identifiers
>>
>>     Fix reading and printing of CFI flashes 16-bit devices identifiers
>>
>>     Nowadays CFI flashes have a 16-bit device identifier.  U-boot still
>>     print them and read them as if they were only 8-bit wide.  Fix that.
>>     Before:
>>       Intel Extended command set, Manufacturer ID: 0x89, Device ID: 0x1B
>>     After:
>>       Intel Extended command set, Manufacturer ID: 0x89, Device ID: 0x881B
>>
>> So please update to the latest version and try again.
>
> Sorry for not intimating the version I used, actually I am using the
> latest u-boot version 2013.01.01
> Below link the head commit for cfi_flash.c
> http://git.denx.de/?p=u-boot.git;a=commit;h=d2af028db3f75390f56f018e16c0f269521e07c5
>
> I am not sure whats wrong with code for detecting the m/c ID.
>
> Please let me know your inputs.
>
> Thanks,
> Jagan.

For your information, I am using below configs for my nor setup.

#define CONFIG_SYS_FLASH_BASE           0xE2000000
# define CONFIG_SYS_FLASH_SIZE           (16 * 1024 * 1024)
# define CONFIG_SYS_MAX_FLASH_BANKS      1
# define CONFIG_SYS_MAX_FLASH_SECT       512
# define CONFIG_SYS_FLASH_ERASE_TOUT     1000
# define CONFIG_SYS_FLASH_WRITE_TOUT     5000
# define CONFIG_FLASH_SHOW_PROGRESS     10
# define CONFIG_SYS_FLASH_CFI
# undef CONFIG_SYS_FLASH_EMPTY_INFO
# define CONFIG_FLASH_CFI_DRIVER
# undef CONFIG_SYS_FLASH_PROTECTION /* don't use hardware protection */
# define CONFIG_SYS_FLASH_USE_BUFFER_WRITE /* use buffered writes (20x
faster) */

Please let me know, if am wrong with any settings..

Thanks,
Jagan.