Re: [gentoo-user] booting - I don't anystand how the (Linux) world works anymore

[Helmut Jarausch]

On 06/25/2016 09:39:32 PM, David W Noon wrote:
> On Sat, 25 Jun 2016 20:33:31 +0200, Helmut Jarausch
> (jarausch@××××××.be) wrote about "[gentoo-user] booting - I don't
> anystand how the (Linux) world works anymore" (in
> <YseLVsRteFjBS+5CTTP64t@7zc0huhpDvqcKwT48Q8b0>):
>
> [snip]
> > So, I came up with    root=UUID=uuid_number of the root file
> > system.
> >
> > But to my surprise I now got  a kernel panic syncing: VFS: unable
> > to mount root fs on unknown block(0,0)
> >
> > So, please tell me what I'm missing?
>
> How are you configuring the kernel modules to operate your disk
> controllers? This situation is usually typical of having more than one
> set of disks from which the system can boot.

Yes, or several partitions on a disk.
>
> I always statically link the driver that operates the controller that
> connects the root device and modprobe the drivers that operate the
> other disk controllers. This ensures that the controller for my
> /dev/sda device is probed first and its drives get "a", "b" and "c" in
> /dev/sd?, and those letters are assigned in device address order on
> the controller.

Thanks Dave,
but I do statically link the corresponding device drivers, as well.
But I don't understand why my only hard drive is named sdb?
It looks as if my kernel named my built-in CDROM device as /dev/sda .
And if I have plugged in an USB drive it seems to influence the naming  
scheme, as well.

And, to make it even more complicated, once the system is up, it has a  
different naming scheme.
E.g. now my internal hard disk has the name /dev/sda but if I tried to  
boot by this name it fails.

For a normal human as me, this is just crazy!

Helmut