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

[Jagan Teki]

Hi Stefan,

On Fri, Feb 22, 2013 at 9:02 PM, Jagan Teki <jagannadh.teki at gmail.com> wrote:
> 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.

Could you please send your comments.

Thanks,
Jagan.