Re: [PATCH 2/3] mtd: davinci-nand: add dts property for NAND_NO_SUBPAGE_WRITE option

Warner Losh
2014-03-20T18:09:35Z

On Mar 20, 2014, at 12:02 PM, Santosh Shilimkar <santosh.shilimkar@ti.com> wrote:

> On Thursday 20 March 2014 01:44 PM, Warner Losh wrote:
>>
>> On Mar 20, 2014, at 11:37 AM, Santosh Shilimkar <santosh.shilimkar@ti.com> wrote:
>>
>>>
>>>
>>> On Thursday 20 March 2014 01:29 PM, Brian Norris wrote:
>>>> On Thu, Mar 20, 2014 at 01:12:35PM -0400, Santosh Shilimkar wrote:
>>>>> Boris,
>>>>
>>>> Who's Boris? And why should Boris be taking this patch? It's an MTD
>>>> patch.
>>>>
>>> I got your name completely wrong. Sorry....
>>>
>>>>> On Thursday 20 March 2014 01:06 PM, Ivan Khoronzhuk wrote:
>>>>>> From: Murali Karicheri <m-karicheri2@ti.com>
>>>>>>
>>>>>> After testing NAND flash with ubifs for k2hk-emv board were committed
>>>>>> that flash doesn't support subpage writing, so we can fix it by
>>>>>> adding a property to disable subpage write.
>>>>
>>>> What flash? We try to autodetect NAND as much as possible. Perhaps we
>>>> should be adding infrastructure support instead of hacking it with a DT
>>>> property.
>>>>
>>> We can't auto detect it and thats why the DT approach was taken. We
>>> will double check that.
>>
>> I though sub page writing was one of the fields in the onfi and/or jedec(toggle) meta data structures. Have you looked there?
>>
> Am not sure if I follow you. The limitation is from the TI NAND controller(AEMIF) and
> not the NAND memory.

Then never mind. I thought it was the other side of things.

Warner