On Fri, Jan 16, 2009 at 10:24:56PM +0800, loody wrote:
> my questions are:
> 1. from the log file, it seems somewhere in kernel, we go through
> kobjects one by one.
> (it is only my assumption)
> And it will do so if I call some functions in fs, like
> (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0).
> If my assumptions above are correct, would you please tell me where
> entry point which check each kobject and what it is used for?
It is printing this information out when each kobject is registered, in
kobject_add().
As for what each kobject is used for, that depends on the specific
kobject, they all do different things.
> 2. My kernel seems ready so far because it can successfully keep
> running before run_init_process("/sbin/init"), then it tells me "No
> init found. Try passing init= option to kernel."
> I know the problem comes from I didn't tell the kernel where the
> root file system is.
Yes.
> I have googled the "root file system", but they only tell me the
> purpose of it and minimum elements it should have.
> But I cannot find any information tell me how to let the kernel
> know where it is.
On the command line, with "root=/dev/sda3" or some such device node.
> I have made a root file system with busybox in it and I also make
> it as ext2 format.
> where I should and what I have to pass this information to kernel?
kernel boot command line.
> BTW, does root file system have any relationship with initramfs and initrd?
Yes, you can use the initramfs or initrd as the root filesystem as well,
lots of embedded systems, and almost all distros do this as well.
Hope this helps,
greg k-h
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