Testing Wi-Fi on an emulator

We have now prepared all the images that we need for the testing process. The prebuilt test images for this chapter can be downloaded from the following URL:

https://sourceforge.net/projects/android-system-programming/files/android-7/ch07/ch07.zip/download

Booting an Android emulator using initrd.img

We can execute the following command to boot the system using initrd.img first:

$ cd $OUT 
$ emulator @a25x86 -ranchu -verbose -show-kernel -system ./system-qcow2.img -ramdisk ./initrd.img -initdata ./userdata-qcow2.img -kernel ./kernel -qemu -netdev user,id=mynet1,net=10.0.2.0/24,dhcpstart=10.0.2.50 -device virtio-net,netdev=mynet1 

In the preceding command, we use QCOW2-format images for both system and user data, since they are much smaller than the plain file images. We use initrd.img as the ramdisk so that we can debug the configuration in the first stage of boot up. We can also change this script to use ramdisk.img directly. In this case, it is the normal start...