[Edited Message Follows] [Reason: Simplify issue description and fix link] Hi all,
in general I am interested in using a dts to get a dtbo and get the second one loaded by u-boot when using SOC AM335x (my current test board is a Beagleboard green). At the moment I am trying to use a BB-BONE-LCD5-01-00A1.dts to customise the kernel device tree. Unfortunately, despite setting the " overlay_files" variable in uEnv.txt: * the generated BB-BONE-LCD5-01-00A1.dtb on the boot folder of the MMC seems to have no effect. * I don't see any useful info on the u-boot log. * checking on /sys/firmware/devicetree/base I am not able to tell if the dtbo has been loaded I am using: * meta-ti: branch zeus, commit 1dd4558 (with a fixed .wks see https://lists.yoctoproject. org/g/meta-ti/message/12916) ( https://lists.yoctoproject.org/g/meta-ti/message/12916) ). I will probably switch to tag ti2020.00 or previous if needed * poky: branch zeus, commit ca9cc50 * meta-openembedded: branch zeus, commit 44e458f * MACHINE set to beaglebone Notes * BB-BONE-LCD5-01-00A1.dtbo has been generated by a recipe that uses the devicetree.bbclass (See device-tree.bb ( https://github.com/nathanrossi/gps-clock-project/blob/wip-devicetree-classify/meta-gps-clock/recipes/device-tree/device-tree.bb ) and openembedded-core ( https://github.com/openembedded/openembedded-core/blob/master/meta/classes/devicetree.bbclass ) ). * to get the .dtbo in the boot partition when using WIC the local.conf (or <machine>.conf or ...) has been edited adding the followiing line IMAGE_BOOT_FILES_append = " devicetree/*" Doubts: * taking a look to the u-boot tag ti2020.01.00 used by the meta-ti version I am using, I see that CONFIG_OF_LIBFDT_OVERLAY is not set for am335x. Therefore I suppose that the variable overlay_files set in uEnv.txt would have no effect for am335X SOC, is it correct? * If the previous point is correct, which is the suggested approach to customise the device-tree with current u-boot? Probably using the "single FIT image" described in overlay-fdt-boot.txt in i-boot sources? Any suggestion would be much appreciated. Regards Luca
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