On Wed 2017-12-20 @ 11:40:50 PM, Greg Wilson-Lindberg wrote: > I'm building an image for the Raspberry Pi 3 and I'm trying to add some > modules to the kernel and I need to add some device tree overlays. The > modules and overlays are part of the kernel, just not built by default. > > For the kernel modules I've added a linux-raspberrypi_4.4.bbappend file in > the path .../recipes-bsp/linux. The file consists of: > > # Scribe additions to Kernel configuration > > FILESEXTRAPATHS_prepend += "$(THISDIR)/files" > SRC_URI += "file://Scribe.cfg" > > Whether I use "+=" or ":=" as suggested in "Embedded Linux Systems withe > the Yocto Project", I get an error that "file://0001-fix-dtbo-rules.patch" > cannot be found. I don't get this error if my .bbappend file is not being > used.
You're missing a colon at the end of the path definition, and you should use the ':=' operator: FILESEXTRAPATHS_prepend := "$(THISDIR)/files:" The path you're introducing is getting added to a bunch of other paths, and therefore needs the separator. The := operator causes your change to this variable to be immediately expanded by bitbake, which is what you want. > Also, if there are any quick tips on how to add dtbo's to the kernel build I > would appreciate them. If you look through the raspberry pi kernel sources ($TMPDIR/work/raspberrypi3-*/linux-raspberrypi/${VERSION}/linux-raspberrypi3-standard-build/source) at arch/arm/boot/dts/overlays and find an overlay you like (e.g. spi1-3cs-overlay.dts) then to have it added to your image and applied at boot time: 1. edit local.conf to add it to the kernel's device tree (but add it as a dtbo without the "-overlay"): KERNEL_DEVICETREE_append = " overlays/spi1-3cs.dtbo" 2. extend rpi-config to include it in the image's config.txt file: rpi-config_%.bbappend: do_deploy_append() { echo "dtoverlay=spi1-3cs" >>${DEPLOYDIR}/bcm2835-bootfiles/config.txt" } -- _______________________________________________ yocto mailing list yocto@yoctoproject.org https://lists.yoctoproject.org/listinfo/yocto