On Fri, 22 Jul 2016 22:16:41 -0600 Warner Losh <i...@bsdimp.com> wrote:
> On Fri, Jul 22, 2016 at 1:03 AM, David Chisnall <thera...@freebsd.org> wrote: > > On 22 Jul 2016, at 03:40, Warner Losh <i...@bsdimp.com> wrote: > >> > >> On Wed, Jul 20, 2016 at 9:51 AM, David Chisnall <thera...@freebsd.org> > >> wrote: > >>> On 20 Jul 2016, at 16:46, Warner Losh <i...@bsdimp.com> wrote: > >>>> > >>>> I've been trying to get the final spec for it. Right now it's a > >>>> disorganized series > >>>> of patches, some of which have been merge some that haven't. I'll send > >>>> you a > >>>> copy when I can find something better than "here's the code." > >>> > >>> Thanks. From the information I can find, it looks as if most of the > >>> machinery required to implement it is already in dtc, so it should > >>> (hopefully) just be a matter of adding a new keyword to detect plugins, a > >>> scan to find the cross-references (or possibly reusing the existing one) > >>> and then a little bit of extra logic. > >> > >> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/devicetree/overlay-notes.txt > >> has the specs. > > > > Hmm, that?s even less complete than the docs that I?d found. > > Can you share that then? > > >From that, it seems as if the only thing that dtc needs to do is support the > >/plugin/ syntax and emit a section describing unresolved references? > > I believe so, yes. > > >Or is dtc also expected to be able to do the merging? > > I think that's TBD. We'll need, at the very least, an update libfdt > from upstream that knows how to do the merging, as well as changes to > /boot/loader to be able to pick and choose which plugins to add to the > base. If we can do all that with the BSDL DTC and it passes all the > other GPL test cases, then we may have a winner and we can get started > integrating plugin support to /boot/loader. I know my RPi would be > happier if it had a 'standard' DTB with a plugin for whatever 1-wire > stuff I'm playing with today. > > Warner ubldr already support dtb overlays as of r298821. Also support might come to uboot directly soon. -- Emmanuel Vadot _______________________________________________ freebsd-current@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"
