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Copying files from the read-only root filesystem to the tmpfs providing the volatile directories can be slow and waste memory. If the kernel supports the overlay filesystem, use it to mount a writable tmpfs on top of the read-only directory from the rootfs and avoid copies. Analogous to the modification made to initscripts's read-only-rootfs-hook in 370fda1b2e8d5dc011522131bba4106de26bfb19. (From OE-Core rev: b4976f3cf8cd028f165100b67867adb862da4d7f) Signed-off-by: Matt Hoosier <matt.hoosier@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.