Messages in this thread | | | From | Segher Boessenkool <> | Subject | Re: [PATCH] Open Firmware device tree virtual filesystem | Date | Tue, 2 Jan 2007 22:40:17 +0100 |
| |
>> 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 ;-)
Oh I know. With a sane OF implementation, things will work out fine though.
>> 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.
You're almost convincing me. I'll sleep on it a night.
Segher
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |