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* tools/include/linux/bits.h was added in v4.20-rc1 with this commit: commit ba4aa02b417f08a0bee5e7b8ed70cac788a7c854 Author: Arnaldo Carvalho de Melo <acme@redhat.com> Date: Tue Sep 25 10:55:59 2018 -0300 tools include: Adopt linux/bits.h * also if you're building for such older kernel you will probably see do_compile failing with: | config/Makefile:448: Missing perl devel files. Disabling perl scripting support, please install perl-ExtUtils-Embed/libperl-dev | config/Makefile:495: Python 3 is not yet supported; please set | config/Makefile:496: PYTHON and/or PYTHON_CONFIG appropriately. easiest work around is to disable scripting PACKAGECONFIG, because since oe-core commit: commit 584af667e0000129bcb5c9e8108485f2f6590eaf Author: Bruce Ashfield <bruce.ashfield@gmail.com> Date: Wed Aug 28 22:14:41 2019 -0400 perf: change dependencies on python to python3 The upstream kernel can now handle python3 for the perf scripts, coupled with the impending EOL of python2, we switch the dependencies in perf (scripting) to python3. it now uses python3, but the support for that was added in kernel v4.17-rc1 with: commit 66dfdff03d196e51322c6a85c0d8db8bb2bdd655 Author: Jaroslav Skarvada <jskarvad@redhat.com> Date: Fri Jan 19 21:56:41 2018 +0100 perf tools: Add Python 3 support Added Python 3 support while keeping Python 2.7 compatibility. if you really need scripting support than either backport the kernel patch to your kernel or undo the perf recipe changes. (From OE-Core rev: d6ee3d3bdf183a9060b5b0c25b97688a4b9d40dc) Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com> Signed-off-by: Ross Burton <ross.burton@intel.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.