linux-kernel - Re: [PATCH] Open Firmware device tree virtual filesystem

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Message-Id: <69fccc6b0149520efdb3edc478e98304@kernel.crashing.org>
Date:	Tue, 2 Jan 2007 13:36:19 +0100
From:	Segher Boessenkool <segher@...nel.crashing.org>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	linux-kernel@...r.kernel.org, devel@...top.org,
	David Miller <davem@...emloft.net>, dmk@...x.com,
	wmb@...mworks.com, hch@...radead.org, jg@...top.org
Subject: Re: [PATCH] Open Firmware device tree virtual filesystem

>> Simple system tools should not need to interpret binary data in
>> order to provide access to simple structured data like this, that's
>> just stupid.
>
> I would agree with you if the data was properly typed in the first 
> place
> but it's not,

OF device tree properties are "properly typed" just fine -- it's
just that only the intended consumers of the data know what to
expect, you certainly can't derive the data structures from just
looking at the data in one instance of a property.

Put another way, if you know what you are looking for in the
device tree, you can decode a property just fine -- if you're
given a random property on the other hand, you can never get
any better than the generic property structure of "array of bytes".

Segher

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