Setting up development environment using QEMU.

[Adam Lee]

On Sat, Jun 09, 2012 at 04:19:15PM +0600, Aft nix wrote:
> Thank you for the tips. qemu is booting the kernel now. But it stops
> with a kernel panic.
> 
> >From qemu console,
> 
> [    2.209887] EXT3-fs (sda): mounted filesystem with writeback data mode
> [    2.210566] VFS: Mounted root (ext3 filesystem) readonly on device 8:0.
> [    2.211393] Freeing unused kernel memory: 456k freed
> [    2.242325] Write protecting the kernel text: 6240k
> [    2.242614] Write protecting the kernel read-only data: 1820k
> [    2.248007] Kernel panic - not syncing: No init found.  Try passing
> init= option to kernel. See Linux Documentation/init.txt for guidance.
> [    2.248492] Pid: 1, comm: swapper/0 Not tainted 3.4.0+ #3
> [    2.248596] Call Trace:
> [    2.249743]  [<c160db4f>] panic+0x81/0x17e
> [    2.249843]  [<c10012d5>] init_post+0x75/0xb0
> [    2.249942]  [<c183a61a>] kernel_init+0x1e0/0x1ea
> [    2.250028]  [<c183a3df>] ? parse_early_options+0x35/0x35
> [    2.250237]  [<c183a43a>] ? repair_env_string+0x5b/0x5b
> [    2.250326]  [<c1616cd6>] kernel_thread_helper+0x6/0xd
> ...
> My understanding is i have to put the init binary in my root fs. But
> i'm clueless about how to do that?

You need a full system, kernel is just the core.

I suggest you using Debian stable images for QEMU at
http://people.debian.org/~aurel32/qemu
(ref: http://wiki.debian.org/QEMU)

Or, use busybox to build rootfs like what I am doing:
https://github.com/adam8157/kernel-studio

-- 
Regards,
Adam Lee
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E-mail: adam8157 at gmail.com
Website: http://adam8157.info
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