On Tue, May 12, 2020 at 6:32 AM Luca <[email protected]> wrote: > > [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). 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 and openembedded-core). > 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.
Just use the BeagleBone "Green" base dtb, use the "fdtoverlay" dtc utilty to add the BB-BONE-LCD5-01-00A1 on top of the Green *.dtb and load it like normal in yocto.. Regards, -- Robert Nelson https://rcn-ee.com/
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