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Booting a Linux kernel
Building a current Linux kernel with multi_v7_defconfig should be
enough to get something running. Nowadays an out-of-tree build is
recommended (and also useful if you build a lot of different targets).
In the following example $BLD points to the build directory and $SRC
points to the root of the Linux source tree. You can drop $SRC if you
are running from there.
$ make O=$BLD -C $SRC ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- multi_v7_defconfig
$ make O=$BLD -C $SRC ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf-
By default you will want to boot your rootfs off the sdcard interface.
Your rootfs will need to be padded to the right size. With a suitable
DTB you could also add devices to the virtio-mmio bus.
$ qemu-system-arm -cpu cortex-a15 -smp 4 -m 4096 \
-machine type=vexpress-a15 -serial mon:stdio \
-drive if=sd,driver=file,filename=armel-rootfs.ext4 \
-kernel zImage \
-dtb vexpress-v2p-ca15-tc1.dtb \
-append "console=ttyAMA0 root=/dev/mmcblk0 ro"
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