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Date: Wed, 13 Jun 2012 08:56:12 -0700
From: Darren Hart <dvhart@linux.intel.com>
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Subject: Re: qemux86 Image won't boot from CF
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On 06/12/2012 04:07 AM, Jürgen Messerer wrote:
> Hi everybody.
> 
>  
> 
> The following problem occurs when I try to start a x86 linux system from
> CF-Card.
> 
>  
> 
> I have generate a qemux86 core-image-minimal  image with the latest pokey.
> 

...

> VFS: Unable to mount root fs via NFS, trying floppy.
> 
> VFS: Cannot open root device "hdb1" or unknown-block(2,0)
> 
> Please append a correct "root=" boot option; here are the available
> partitions:
> 
> VFS: Unable to mount root fs on unknown-block(2,0)

The kernel should list the known block devices. It isn't finding any. So
either you don't have the driver for it installed, or it is a removable
device. As Andrea pointed out, rootwait can help with the latter.

However, it should be noted that the qemux86 machine is intended to be
booted under emulation, and has the drivers required for that scenario.
If you want to boot on real hardware, you really should be creating a
machine config and a kernel bbappend with whatever drivers you need for
your hardware in a config fragment.

-- 
Darren Hart
Intel Open Source Technology Center
Yocto Project - Linux Kernel