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This bbclass implements the device tree compilation for user provided device trees. In order to use this class, it should be inherited in a BSP recipe which provides the sources. The default setup enables inclusion of kernel device tree sources (though can be disabled by the recipe by overriding DT_INCLUDE or KERNEL_INCLUDE). This provides an additional mechanism for BSPs to provide device trees and device tree overlays for their target machines. Whilst still enabling access to the kernel device trees for base SoC includes and headers. This approach to providing device trees has benefits for certain use cases over patching the device trees into the kernel source. * device trees are separated from kernel source, allows for selection of kernel and or kernel versions without needing to explicitly patch the kernel (or appending to the kernel recipes). * providing device trees from separate sources, from the layer, generated by the recipe or other recipes. This class also implements some additional features that are not available in the kernel-devicetree flow. This includes population of device tree blobs into the sysroot which allows for other recipes to consume built dtbs (e.g. U-Boot with EXT_DTB compilation), device tree overlay compilation and customizing DTC compilation args (boot cpu/padding/etc.). (From OE-Core rev: 3874c3859c3515fc8440fa9e776a02ad6ff3135c) Signed-off-by: Nathan Rossi <nathan@nathanrossi.com> Acked-by: Martin Hundebøll <mnhu@prevas.dk> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
QEMU Emulation Targets ====================== To simplify development, the build system supports building images to work with the QEMU emulator in system emulation mode. Several architectures are currently supported in 32 and 64 bit variants: * ARM (qemuarm + qemuarm64) * x86 (qemux86 + qemux86-64) * PowerPC (qemuppc only) * MIPS (qemumips + qemumips64) Use of the QEMU images is covered in the Yocto Project Reference Manual. The appropriate MACHINE variable value corresponding to the target is given in brackets.