Messages in this thread | | | Subject | Re: [PATCH] Open Firmware device tree virtual filesystem | From | Benjamin Herrenschmidt <> | Date | Wed, 03 Jan 2007 08:32:36 +1100 |
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> The kernel doesn't care if one CPU is in OF land while the others > are doing other stuff -- well you have to make sure the OF won't > try to use a hardware device at the same time as the kernel, true.
That statement alone hides an absolute can of worms btw ;-)
> I'm a bit concerned about the 100kB or so of data duplication > (on a *quite big* device tree), and the extra code you need > (all changes have to be done to both tree copies). Maybe > I shouldn't be worried; still, it's obviously not a great > idea to *require* any arch to get and keep a full copy of > the tree -- it's wasteful and unnecessary.
Well, big device-trees generally are on big machines with enough memory not to care and the only platform I know where the DT can actually change over time is IBM pSeries when doing DLPAR, in which case, OF is dead, it all happens via magic HV/RTAS calls and the kernel is -supposed- to maintain it's own copy and add/remove nodes from it.
Ben.
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