Re: [PATCH V3 1/3] mtd: add new fields to nand_flash_dev{}

[Huang Shijie]

ä 2013å03æ04æ 16:24, Artem Bityutskiy åé:
> On Mon, 2013-03-04 at 16:08 +0800, Huang Shijie wrote:
> > ä 2013å03æ04æ 15:50, Artem Bityutskiy åé:
> > > On Mon, 2013-03-04 at 13:57 +0800, Huang Shijie wrote:
> > > > The current code uses the @id to store the device id(byte 1).
> > > > But if we use the 8 bytes id data as the keyword, and expand the @id
> > > > field to 8byte array,
> > > > the device id is the second byte now. All the added zeros are for the
> > > I do not think you need to store the full array of ID's. Device ID's for
> > > all the 4 of above chips are different, which is enough to distinguish
> > > between them.
> > >
> > > The only thing you need to add is the OOB size field to 'struct
> > > nand_flash_dev'.
> > If i only add the oob size field. There will be two items with the same
> > Device ID in nand_flash_ids table,
> > one has oob_size, one does not have. such as:
> >
> >      {"NAND 8GIB 3,3V 8-bit", 0xDE, 0, 8192, 0, LP_OPTIONS},
> Do you know what is this chip?
this maybe not just a nand chip, it may stands for a class of nand chips.
Toshiba may uses this device id, Micron may also uses it.

In other word, this item may stands for many nand chips.
> >      {"NAND 8GIB 3,3V 8-bit", 0xDE, 0, 8192, 0, LP_OPTIONS, 640},   //OOB
> > size is 640
> So there are really 2 different chips with the same device id and
> different OOB size? If you had 2 datasheets for me demonstrating this,
> I'd be grateful.
Please see the http://www.linux-mtd.infradead.org/nand-data/nanddata.html
The ST's NAND08GW3B2C and Numonyx's NAND08GW3F2B share the same device 
id but with the
different oob size.

thanks
Huang Shijie



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