Hi Jagan, On Thu, Feb 21, 2013 at 9:03 AM, Jagan Teki <jagannadh.t...@gmail.com> wrote: > Hi All, > > I am planning to use devicetree on u-boot. > I have an experience to work with devicetree on Linux. > > For u-boot, I have read doc from doc/README.fdt-control. > I see some dts usages on tegra boards. > > I have lot of confusions with the concept itself. > > Is Linux and u-boot devicetree concept and build system are same?
I don't really understand this question sorry. U-Boot and Linux use the device tree mainly for run-time configuration of drivers, so that the same driver code can operate on different boards. > > Suppose I have 4 boards J1, J2, J3 & J4 on my soc "emb".of vendor "vast" > For this requirement I have > board/vast/dts/J1.dts > board/vast/dts/J2.dts > board/vast/dts/J3.dts > board/vast/dts/J4.dts > > include/configs/emb_common.h ==> single configuration of all SOC > needed definitions > like defconfig in Linux. > > do I need any more files? That's enough for the basics I think. > > In emb_common.h i am defining > CONFIG_OF_SEPARATE is it sufficient? And CONFIG_OF_CONTROL > > My plan is to build u-boot and then build the dtb with specific > board and then combine. That's fine, and is how we do things on Chromium also. U-Boot tries to build an FDT even with CONFIG_OF_SEPARATE, so you need to put a default device tree file in your emb_common.h file that it can find. But you can ignore it, and for flashing your boards just use u-boot.bin plus whatever .dtb you want to select. > > I saw that all tegra boards config files are defining > CONFIG_DEFAULT_DEVICE_TREE if ie. the case dts is a compile time > option right. > am i correct? Yes - see above. This is convenient for testing and development. > > Please let me know your inputs. Regards, Simon > > -- > Thanks, > Jagan. _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
