[Fwd: RE: [U-Boot-Users] Incorrect flash ids?]
wd at denx.de
Tue Jan 13 21:09:02 CET 2004
In message <204184.108.40.206.8.1074021611.squirrel at www.orkun.us> you wrote:
> Well, there is no end to it. In my previous job, hardware engineer decided
> to use 64bit bus for flash so we had 4 of them to make 64bit bus(MPC755).
> So, the 32 bit ones is not enough to compare all 4 anyway.
It is. You can read 64 bits in two chunks of 32 bits each. There is
actually little chance that the upper and the lower half of your bus
will use different flash chips.
> Another perfectly valid (but unusual) scheme is to map 4 devices each in
> byte mode. That 4 byte ID read would be different that the stored one if
> you wanted to compare them bus wide.
No problem. I think there are boards doing exactly this.
See us @ Embedded World, Nuremberg, Feb 17 - 19, Hall 12.0 Booth 440
Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd at denx.de
As usual, this being a 1.3.x release, I haven't even compiled this
kernel yet. So if it works, you should be doubly impressed.
- Linus Torvalds in <199506181536.SAA10638 at keos.cs.Helsinki.FI>
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