[U-Boot] Add new NAND flash

[Scott Wood]

On Sat, 2 Oct 2010 14:50:23 +0200
Matthias Weißer <weisserm at arcor.de> wrote:

> Hi Scott
> 
> Am 01.10.2010 21:52, schrieb Scott Wood:
> > On Fri, 1 Oct 2010 16:31:40 +0200
> >> MT29F16G08CBABA
> >> The NAND is connected (8 bit wide) to an iMX25 which is booting from 
> >> NOR. So the NAND is only a mass storage device. I am able to read the ID 
> >> of the chip.
> >>
> >> 2Ch 48h 04h 46h 85h
> >>
> > 
> > According to http://patchwork.ozlabs.org/patch/60042/, this chip
> > is supposed to have ID: 2C 48 00 26 89
> 
> Take a closer look at the table in the link. There is a MT29F16G08ABABA
> with ID: "2C 48 00 26 89" and a MT29F16G08CBABA with ID: "2C 48 04 46
> 85". The second one is the one I have here.

Ah, misread the part name.

> I have also a datasheet of the chip here from where I copy & pasted the above ID. The ID gets read
> correctly from the chip by u-boot NAND subsystem.

Does the datasheet say anything about what it intends that bit to
mean?  Is there a new ID format we need to support?

> > Do you have a datasheet that says what it's supposed to be?
> > 
> > The bytes may be getting corrupted.  If you hack up the code to
> > override the ID bytes with good ones, do you see any problems doing
> > real I/O?
> 
> I tried that. If I run a "nand bad" command then it never returns and
> keeps performing some actions on the NAND device as I can see with an
> oscilloscope.

Could you instrument the code to see what software thinks it's doing?

-Scott