CFI with 4 x8/x16 devices on a 32-bit bus

[Joakim Tjernlund]

Hi

I been all the time wrong! I just discovered that hexl-mode i emacs is
broken!
Emacs in hexl-mode displays 81ff81ff81ff ... and od -x says fffffff ...

Sorry about that.

While I am at it perhaps someone can enlighten me somewhat ...

I am a bit confused about how add_mtd_device() and add_mtd_partitions()
work.
Looking in nora.c it looks like you can partition a flash by doing 
a few calls to add_mtd_device() with different offsets, but if you can do
that with add_mtd_device(), what's the point with add_mtd_partitions()?

I am missing something here, can someone explain when and how you are
supposed to
use these two functions?

 Jocke



-----Original Message-----
From: owner-mtd at infradead.org [mailto:owner-mtd at infradead.org]On Behalf
Of Kári Davíðsson
Sent: Thursday, April 12, 2001 14:42
To: mtd at infradead.org
Subject: RE: CFI with 4 x8/x16 devices on a 32-bit bus 




> -----Original Message-----
> From: Joakim Tjernlund [mailto:joakim.tjernlund at lumentis.se]
> Sent: 11. apríl 2001 15:05
> To: mtd at infradead.org
> Subject: RE: CFI with 4 x8/x16 devices on a 32-bit bus 

<snip>
 
3) 2 partitions( tried a few different sizes) - Not OK, here I get
81ff81ff81ff ... !

You get this behaviour for both partitions? Also one that has all
sectors of the same size?

<snip>

> 
> Apparently this is chip with 2 erase sectors sizes. I suspect 
> the different
> sector sizes
> is the cause to my problems, but I cant figure out where the 
> problem is. I
> have
> tried with&whithout virtual regions.

Get it to work without the viertual regions. Then add the virtual
regions if you need them. Stricly speeking you anly need them if you
have a partition that you need to manage that crosses erase region
boundary. It is hightly experimental code
that has only be tested on my single 16bit wide Intel chip so it is
bound to fail
on more complex setups.

K.D.

<snip>


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