[U-Boot] [NEXT PATCH v1 2/7] NAND: added NAND type to nand_ids

Stefano Babic
2012-10-01T07:02:30Z

On 11/09/2012 01:18, Scott Wood wrote:
> On 09/10/2012 07:09 AM, Stefano Babic wrote:
>> On 07/09/2012 20:56, Scott Wood wrote:
>>> What kind of chip is this? Is the datasheet publicly available?
>>>
>>> These threads seem relevant:
>>> http://patchwork.ozlabs.org/patch/60042/
>>> http://old.nabble.com/-U-Boot--Add-new-NAND-flash-td29858370.html
>>
>> It is the same case, as I can see, with the same chip.
>>
>>>

Hi Scott,

>>> Does the chip support ONFI?
>>
>> The chip supports ONFI, but it seems the i.MX driver does not. Quite as
>> described in http://patchwork.ozlabs.org/patch/60042/. READ-ID is always
>> sent with address 0, I do not know if we can convince the driver to send
>> the address.
>
> How did Linux end up resolving this?

I could take a closer look. The issue is not solved on linux, too. In
fact, the MXC driver in current kernel supports ONFI, but it should work
for newer version of the controller - I think with MX5.

On MX35, the NFC controller is V1.1, exactly as on MX25, and I have the
same issue reported by Matthias that you pointed out in the past
threads: ONFI command does not work.

> I think it'd be better to have the
> Micron decoding logic from that patch, than to introduce a special
> addition to the ID table for this one chip, which might not be correct
> for all chips with that ID byte.

Agree. I am trying to contact Micron to get some information about it. I
have tried to decode the bytes on basis of other Micron's NAND, but then
bit 6 in byte 4 says that the NAND is a 16 bit device, and that is
wrong. Exactly the same wrong value that Matthias found some times ago.

Stefano

--
=====================================================================
DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: +49-8142-66989-53 Fax: +49-8142-66989-80 Email: sbabic at denx.de
=====================================================================