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Currently DTC_FLAGS kernel makefile parameter can be specified directly on the command line by adding it to KERNEL_EXTRA_ARGS. However, this prevents scripts/Makefile.lib logic from appending flags that silence dtc warnings (all assignments done from within a makefile, to a variable specified on the command line, are ignored). Because of this, the do_compile log is cluttered with dtc warnings that should only be printed when compiling with W="123": ... /soc: node has a reg or ranges property, but no unit name /soc/gpu: missing or empty reg/ranges property /soc/firmware/gpio: missing or empty reg/ranges property ... To fix this, introduce the dedicated KERNEL_DTC_FLAGS variable to hold dtc flags and export DTC_FLAGS in the environment before generating the dtbs (make allows "+=" operations on variables that come from the environment, so the warnings are silenced properly). (From OE-Core rev: 063b5de86624a42b0aa784db6dddc7552a6dee7f) Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com> 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.