On 10/31/2012 6:36 PM, Stephen Warren wrote: > On 10/31/2012 05:56 PM, Mitch Bradley wrote: >> On 10/31/2012 1:00 PM, Daniel Mack wrote: >>> cc devicetree-discuss. Here's a reference to the full thread: >>> >>> http://thread.gmane.org/gmane.comp.boot-loaders.u-boot/145221/ >>> >>> On 26.10.2012 20:39, Stephen Warren wrote: >>>> On 10/24/2012 03:47 AM, Daniel Mack wrote: >>>>> Hi, >>>>> >>>>> a project I'm involved in uses a module/baseboard combo, and components >>>>> on either board are described in DT. I'm currently using separate dts >>>>> files which build upon each other with include statements, which works >>>>> fine for development. >>>>> >>>>> In production though, we will certainly have running changes (and hence >>>>> different versions) over the lifetime of the product for both the >>>>> baseboard and the module, and the hardware has support for identifying >>>>> the versions of both sides at runtime. > ... >>> I start to believe that the cleanest solution to this would be to >>> have full DTC functionality in U-Boot and compile the tree >> >> ... which is exactly the way that Open Firmware does it, since the >> invention of the device tree. The model is that the boot firmware, >> which needs to know the system configuration to do its job anyway, >> exports that configuration via the device tree. > > Doesn't OF generate the DT from internal data structures (although I > don't know where those come from...), whereas what Daniel mentions above > is more like the bootloader having access to a bunch of .dts fragments, > selecting the appropriate subset of those to use, parsing them into an > internal data structure (i.e. running dtc), and then generating a DTB > from it. The overall result is that the bootloader causes a DTB to be > generated at run-time, so at that level it's the same, but the > implementation seems pretty different.
Yes, which is why I cut the cited sentence at the place I did (before the part about dts fragments). > _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
