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

[Stefan Roese]

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.

Best regards,
Stefan