Re: [PATCH] Open Firmware device tree virtual filesystem

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There is one big problem: text representation is useless
(to scripts etc.) unless it can be transformed back to binary;
i.e., it has to be possible to reliably detect _how_ some
property is represented into text, something that cannot be
done with how openpromfs handles it.

Text is text is text for many propertiers,

Sure some properties contain (or _should_ contain!) just
one simple text string.  You can simply "cat" those when
they are binary in the filesystem too FWIW.

in particular
the ones you actually end up wanting to modify.

But that is just one simple use of the filesystem.  One that
doesn't work at all on PowerPC btw -- at kernel run time,
we don't have access to OF at all anymore.

In order for a problem to exist, you have to show counter
examples where the problem triggers and something fails.

What in userspace wants to modify a OFW property, which
is not text?

I never was talking about modifying.  Most things that
most users want to modify aren't normal OF properties
anyway, but configuration variables.  In some/many OF
implementations updating those via the device tree doesn't
work.

In my experience all such cases are limited to ASCII text
valued properties, such as device aliases, environment
variables, and things like nvramrc.

If the text representation in the file system was unambiguous,
it wouldn't be useless for scripts anymore, merely very
inconvenient.


Segher

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