Subject: Re: [PATCH 2/6] PowerPC 440EPx: Sequoia DTS

From: Segher Boessenkool <[email-masked]>
Date: Tue, 7 Aug 2007 01:09:22 +0200

>>     Actually, checking for the presence of all possible perverted
>> mapping
>> props doesn't seem a good idea -- it's simpler to check for the
>> presence of
>> one prop (like "direct-mapped" I was thinking about, or maybe
>> "simple-map").
>
> Or more simply... if it's not a direct mapping, it doesn't have a 
> ranges
> property and can't be walked down by conventional means.

That establishes that the flash address space is mapped 1-1 into
the host address space; however it doesn't say anything about
swizzling or interleaving or endianness etc., which are important
for NOR flash memory because of how the command sets work.

Segher