On 12/05/2013 01:15 PM, Ian Campbell wrote: > On Thu, 2013-12-05 at 13:04 +0100, Marc Kleine-Budde wrote: >> On 12/05/2013 12:57 PM, Ian Campbell wrote: >>> On Thu, 2013-12-05 at 12:46 +0100, Marc Kleine-Budde wrote: >>>> On 12/05/2013 12:34 PM, Martin Michlmayr wrote: >>>>> * Marc Kleine-Budde <m...@blackshift.org> [2013-12-05 11:49]: >>>>>> That's no option, as non DT Sheeva Plug support has been removed from >>>>>> the kernel in ffbc50663b69462adc9d97b93b6b92c4fe74b94c: >>>>>> >>>>>> ffbc506 ARM: kirkwood: remove support for legacy booting of Sheevaplug >>>>> >>>>> Interesting. I thought they promised not to remove non-DT support for >>>>> existing devices. >>>> >>>> I personally don't mind, if it's removed once the DT works properly. >>>> >>>>> Anyway, Marc, so thanks for your patch. I wonder if it makes sense to >>>>> add a check to flash-kernel whether DT is required or not. i.e. that >>>>> flash-kernel would append the DT blob on 3.12+ kernels on SheevaPlug >>>>> but not on previous kernels. >>>> >>>> Yes, sounds like the way to go. Otherwise you have to tie certain >>>> flash-kernel versions to the non-DT and DT kernels. This will probably >>>> not scale when more no-DT board are removed from the kernel. >>>> >>>> Where should this information go? What about adding another field to >>>> all.db which limits an entry to certain kernel versions? Something like >>>> this: >>> >>> I think it would be sufficient to have a field marking the DTB as >>> optional and have f-k only do the append if there is a dtb present in >>> the DTS directory (/usr/lib/linux-X.Y/whatever) for the version it is >>> handling. If the kernel needs a DTB but doesn't ship one, well ,that's a >>> bug in the kernel (until we get to the point of burning DTBs into >>> firmware, but lets not worry about that now!). >> >> ...or when the DT sources will be move into a separate repository. > > Indeed. > > Actually, now that I think about it -- a non-DT aware kernel just > shouldn't care if you append a DT to it, it won't ever go looking. It's > probably safe to just append it unconditionally.
Yes, should be safe. > Which is what you did, so we've come full circle, sorry for the > distraction. It's good to talk about the implications. If we want to handle downgrading of kernels with an updated flash-kernel, I think, that cannot be done without an additional Kernel-Version field. This is because v3.11 ships with: /usr/lib/linux-image-3.11-2-kirkwood/kirkwood-sheevaplug.dtb But non-DT Sheeva support is still in the kernel, so non-DT Sheeva Plug is used with current flash-kernel and v3.11. Although v3.10 and v3.11 are not Wheezy's kernels. > I suppose it would be nice to just check that the Wheezy kernel doesn't > complain about or get confused by the appended DTB. Can you check that? I don't have physical access to that Sheeva Plug. Marc
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