Subject: Re: MTD devices in NetBSD
To: Simon Burge <>
From: Garrett D'Amore <>
List: tech-kern
Date: 03/22/2006 15:34:39
Simon Burge wrote:
> "Garrett D'Amore" wrote:
>> Allen Briggs wrote:
>>> You can also find systems where the devices are set up in parallel,
>>> so two 8-bit devices live on a 16-bit bus (or 4 8-bit devices on
>>> a 32-bit bus or 2 16-bit devices on a 32-bit bus, etc.) where one
>>> device uses bit 0-7 and the other uses 8-15.  Something to keep in
>>> mind, perhaps.
>> Hmm... never run into that before.  For read it wouldn't matter, but it
>> could have significant complications for write, because you've got to
>> command each flash part separately.
> FWIW, the Alchemy eval boards are set up this way (two 16-bit flash
> parts set up on a 32-bit bus).  So you end up with what are effectively
> 128kB "sectors", even though the base parts have 64kB physical sectors.

Thanks.  I've not even looked at flash on the Alchemy yet.  We're using
a different flash layout in our final product. :-)

    -- Garrett
> Simon.
> --
> Simon Burge                            <>
> NetBSD Support and Service:

Garrett D'Amore, Principal Software Engineer
Tadpole Computer / Computing Technologies Division,
General Dynamics C4 Systems
Phone: 951 325-2134  Fax: 951 325-2191