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On Thu, 29 May 2003 01:40:30 -0600, Daniel Sheltraw wrote:

> I am having a problem building a new kernel for a MSI 845E Max
> Motherboard. I am running RH9.0 and rebuilding a 2.4.20 kernel. 
> 
> The problem appears to be with the HDD/CD-ROM controller (an 
> ICH4 on an Intel 845E chipset) of the IDE hard-drive (WD 40GB 
> IDE/7200). When I boot my newly built kernel I get a kernel 
> panic with the following lines:
> 
>   VFS: Cannot open root device "LABEL=/" or 00:00
>   Please append a correct "root=" boot option
>   Kernel panic: VFS: Unable to mount root fs on 00:00

Did you create an initrd (RAM-disk) image for your newly built
kernel?

> My old /etc/lilo.conf file (which worked fine) had the 
> following line in it (as does the image section for my new 
> kernel):
> 
>   append = "hdc=ide-scsi root=LABEL=/"
> 
> I am not familiar with what this line is doing. Also I do not
> have a good .config file to work with so I am not at all sure
> of my initial configuration of the IDE and SCSI parts of the 
> kernel (the config file in /boot was garbage on my system).

You find Red Hat's kernel config file in /boot/config-$VERSION
and also in /usr/src/linux-2.4/configs/kernel-* where you need
to pick the right one for your CPU architecture.

> Can you please help me with understanding what that line in
> lilo.conf is about?

"hdc=ide-scsi" is a kernel parameter that enables ATAPI SCSI-Emulation
for /dev/hdc (which is an ATAPI CD-burner most likely).

"root=LABEL=/" is the kernel parameter that specifies your root
partition, the partition mount at '/'. Rather than specifying
the device file, it makes use of partition labels. The
partition with the label '/' is your root partition. You can
examine your partitions with the "e2label" tool.

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