bavernet / qemu-linux Goto Github PK

Although it is made for repository owner and he already knows all the functions, it needs README.md for other people to easily use them.

There are lots of architectures that Linux supports.
Currently it supports only arm architecture because the owner is a developer for embedded devices based on arm architecture.
But, there are many configs depending on each architecture which makes different implementation and a developer for PC could need x86 architecture support.

Actually it doesn't need superuser permissions to copy added files to install directory for rootfs.

$ ./qemu-linux rootfs

...

  ./_install//usr/sbin/ubiupdatevol -> ../../bin/busybox
  ./_install//usr/sbin/udhcpd -> ../../bin/busybox


--------------------------------------------------
You will probably need to make your busybox binary
setuid root to ensure all configured applets will
work properly.
--------------------------------------------------

~/work/qemu-linux
[sudo] password for bsh:

busybox is managed as a submodule.
As it currently places output of busybox and a rootfs image under busybox directory, git commands tend to take long time to check untracked files under busybox repository.

So, it needs to extract them out of busybox directory and those should be ignored when checking the repository.

Because of compiler optimization, it is not easy to match the current pc to its source line.
Therefore, even though we use cgdb to understand and debug Linux kernel, the source line on cgdb seems to be randomly jumped, which makes it unreliable.

Now, it supports only ${ARCH} and ${CROSS_COMPILE} as environment variables, which makes users confused because usually they consider environment variables arguments as belows:

$ ARCH=arm ./qemu-linux  # environment  variables: it works now.
$ ./qemu-linux ARCH=arm # arguemnts: it does not work.

Even though 'qemu-linux' makes it easy to debug and analyze linux kernel on qemu, tmux and cgdb, it is not easy to install the environment with tools such as cross-compiler, qemu, tmux, gdb-multiarch, etc.

It needs prerequisites script for easy installation.