Re: [PATCH 2/4] sparc: break out some prom device-tree buildingcode out into drivers/of

From: Andres Salomon
Date: Tue Jun 29 2010 - 19:36:28 EST

On Tue, 29 Jun 2010 15:42:54 -0600
Grant Likely <grant.likely@xxxxxxxxxxxx> wrote:

> On Tue, Jun 29, 2010 at 9:03 AM, Andres Salomon <dilinger@xxxxxxxxxx>
> wrote:
> > Sparc and OLPC have very similar
> > mechanisms for getting device tree info from OFW, so it makes sense
> > to share code between them.
> Other than the flattened tree step; is the powerpc method dissimilar
> from the Sparc and OLPC method for talking to OFW? (This is not a
> rhetorical question, I'm want to know if I'm missing some details).
> The main difference I know about is that OFW can still kept alive at
> runtime for sparc, which powerpc does not do. However, keeping OFW
> callable is a separate issue from how to extract the device tree.

After having a look at powerpc's flatten_device_tree, I don't see any
obvious reason why OLPC couldn't use this (though it still strikes me
as weird to go from prom->fdt->dt when the option of prom->dt is
available and less complex). Do you already have the patches that put
this into drivers/of/?
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