我想使用orange-pi-zero.conf 构建一个内核zImage
在orange-pi-zero.conf中指定uImage：
KERNEL_IMAGETYPE = "uImage"
我如何在我的元层中覆盖这个变量，即某个图像配方将使用orange-pi-zero.conf；zImage"；价值
类似这样的东西：
自定义图像.bb
IMAGE_INSTALL += "..."
KERNEL_IMAGETYPE = "zImage"
IMAGE_FSTYPES = "${INITRAMFS_FSTYPES}"
COMPATIBLE_MACHINE = "orange-pi-zero"
https://github.com/linux-sunxi/meta-sunxi
解决此问题的一种方法是创建一个{MACHINE}-extra.conf并将其包含在local.conf中
conf/machine/orange-pi-zero-extra.conf
KERNEL_IMAGETYPE = "zImage"
local.conf
include conf/machine/orange-pi-zero-extra.conf