Re: [PATCH] Open Firmware device tree virtual filesystem

[Segher Boessenkool]

> > +A regular file in ofwfs contains the exact byte sequence that
> > +comprises the OFW property value.  Properties are not reformatted
> > +into text form, so numeric property values appear as binary
> > +integers.  While this is inconvenient for viewing, it is generally
> > +easier for programs that read property values, and it means that
> > +Open Firmware documentation about property values applies
> > +directly, without having to separately document an ASCII
> > +transformation (which would have to separately specified for
> > +different kinds of properties).
>
> I appreciate the ASCII formatting that openpromfs currently does.

The text representation (in openpromfs) is *useless*, since it cannot
be transformed back into the binary representation.

Most tools have an easier time using the raw binary version too.
If a user wants to see text, they can use an "lsdevtree" program.

> Perhaps, should OFWFS be used, it could offer both?

Such transformations don't belong in the kernel but in userland.

> > +The recommended mount point for ofwfs is /ofw.  (TBD: Should it be
> > +mounted somewhere under /sys instead?)
>
> Somewhere in /sys/firmware perhaps.

While I hate deep paths, /sys/firmware/device-tree does sound good.


Segher

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