2009/1/16 Greg KH <greg@xxxxxxxxx>:
> On Fri, Jan 16, 2009 at 11:12:56PM +0800, loody wrote:
>> >> 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.
>> Hi:
>> how kernel where the root file system is only by passing him just a string?
>
> The kernel looks up the name in the list of block devices, and
> determines the major:minor number of the device, and then opens that.
> Or you can pass in the major:minor number of the device if you don't
> want to use the name.
Hi:
appreciate your kind help first.
1. please let me briefly explain what I mean "how kernel find out root
file system" above.
In my assumption, I should put kernel and root file system separately
in the dram and let the kernel know where the root file system is.
2. Then kernel starts searching the ramdisk_execute_command in the FHS I made.
before 1, the kernel will have no idea what string, "/init" mean.
After unpack_to_rootfs, if I guess correctly, "/init" has meaning to him.
Is my assumption correct above?
>> What I mean is, I put my decompressed kernel in dram and let it run.
>>
>> And at the end of init_post, it will find out where root file system
>> is by passing him
>> "root=/dev/sda3"?
>
> Yes. As long as you do have a root filesystem on /dev/sda3, which, for
> some reason, I doubt you do :)
>
Would help me to define the "root file system"?
In FHS, I think a minimum file architecture is the definition of root
file system.
like below:
|
|--bin
|--dev
|--etc
|--lib
|--sbin
|--usr
|--var
|--tmp
But why you say "As long as you do have a root filesystem on /dev/sda3"
so you mean
|
|--bin
|--dev
|__sda3 -----> this is root file system?
|--etc
|--lib
|--sbin
|--usr
|--var
|--tmp
appreciate your kind help again,
miloody
> You should pass in the block name for where your root filesystem is.
>
> good luck,
>
> greg k-h
>
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