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When creating images, for anything other than the explicitly stateless case, touch /etc/machine-id so that the images can be booted without an initramfs and with `ro` set on the kernel command line, otherwise system refuses to start: [ 7.222134] systemd[1]: No hostname configured. [ 7.227266] systemd[1]: Set hostname to <localhost>. [ 7.232622] systemd[1]: System cannot boot: Missing /etc/machine-id and /etc is mounted read-only. [ 7.241750] systemd[1]: Booting up is supported only when: [ 7.247362] systemd[1]: 1) /etc/machine-id exists and is populated. [ 7.253752] systemd[1]: 2) /etc/machine-id exists and is empty. [ 7.259757] systemd[1]: 3) /etc/machine-id is missing and /etc is writable. If IMAGE_FEATURES includes `stateless-rootfs` then systemctl-native is not run on the image leaving the image for population at runtime by systemd. (From OE-Core rev: c5fb399f5894c16cf8eeadd507dc38c29b0fd657) Signed-off-by: Alex Kiernan <alex.kiernan@gmail.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.