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How do you make a Rootfs?
This involves the following steps:
- Create directory tree skeleton.
- Install all selected packages in the directory tree.
- Install the necessary libraries from glic.
- Complete the configuration of the rootfs including startup script configuration.
What is Rootfs image?
A rootfs image is just a file system image, that hosts at least an init system. For instance, our getting started guide uses an EXT4 FS image with OpenRC as an init system. Note that, whichever file system you choose to use, support for it will have to be compiled into the kernel, so it can be mounted at boot time.
What is Busybox used for?
Busybox allows you or programs to perform actions on your phone using Linux (copied from Unix) commands. Android is basically a specialized Linux OS with a Java compatible (Dalvik) machine for running programs.
Where is zImage?
arch/i386/boot
The file called zImage is the compressed kernel image that lives in arch/i386/boot after you issued make zImage or make boot — the latter invocation is the one I prefer, as it works unchanged on other platforms.
How to create a filesystem image from rootfs?
Create a filesystem image from the rootfs directory; see Creating a filesystem from a directory. Grab a pre-built kernel for ARM “Versatile” boards patched to run with Cortex-A8 CPU (ARMv7). Use the latest Lucid kernel, or the netboot image, which may not always work:
How to create a tarball of a rootfs file?
You can create a tarball of the rootfs directory, or copy the files into an actual filesystem; see Creating a filesystem from a directory. You might want to do some system configuration before using this rootfs on devices though; see System configuration.
Which is the best way to create a rootfs?
Simplest and recommended way, just run rootstock to create your rootfs (check ARM/RootStock for more info about rootstock). Rootstock will automate the creation of a rootfs tarball and exposes some config options to tweak the contents/setup.
Do you need target hardware to build rootfs?
It’s only from scratch in that you are not starting from installer images, and you don’t need target hardware to build it; the code is not rebuilt though, pre-build .deb packages are downloaded and installed instead. Simplest and recommended way, just run rootstock to create your rootfs (check ARM/RootStock for more info about rootstock).