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

[Jagan Teki]

Hi Stefan,

On Thu, Feb 21, 2013 at 5:27 PM, Jagan Teki <jagannadh.teki at gmail.com> wrote:
> Hi Stefan,
>
> On Wed, Feb 20, 2013 at 11:44 PM, Stefan Roese <sr at denx.de> wrote:
>> Hi Jagan,
>>
>> On 20.02.2013 18:25, Jagan Teki wrote:
>>>> 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.
>>
>> This reminds me of a still pending problem with 8-bit flash chips. Could
>> you perhaps give this patch a try?
>>
>> http://patchwork.ozlabs.org/patch/140863/
>>
>> Not sure if it still applies clean. But it seemed to fix a problem with
>> 8-bit bus flash chips.
>
> I am able to detect the correct Manufacture ID and device ID with these changes.
>
> Bank # 1: CFI conformant flash (8 x 8)  Size: 64 MB in 512 Sectors
>   AMD Standard command set, Manufacturer ID: 0x89, Device ID: 0x7E2301
>   Erase timeout: 4096 ms, write timeout: 2 ms
>   Buffer write timeout: 5 ms, buffer size: 1024 bytes
>
> But the 1024 bytes buffer size is another issues, as Numonyx CFI
> wrongly mentioned 1024 instead of 256.
> Any way that we can fix I guess for N29EW flashes..
>
> but how these changes impacts the other flashes i don't ..
>
> Please find the log message.

I made a fix for hw cfi issue when device is operating in 8-bit mode,
If the above changes are looks fine we may have this fix will solve
the M29EW flashes operates under 8-bit mode.

Could send your comments/views.

Thanks,
Jagan.