RE: kernel compilation problem

RE: kernel compilation problem

[Ray Olszewski]

At 08:46 AM 12/23/2003 -0500, Pacheco Jason NPRI wrote:
> >       Hi,
> > I was compiling the 2.4.18 kernel as a practice run and when I booted
> > thru it I recieved a message during boottime:
> > Kernel panic: VFS unable to mount root fs on 03:05.
> > any clues why?

Where is the host's actual root filesystem? 03:05 says the kernel is 
looking for it on /dev/hda5 ... is that the right place or not? (It's not 
typical for a Debian install, but not impossible either.)

If it is correct -- what filesystem type is it? (ext2, most likely). Make 
sure your kernel has support for that filesystem type compiled in.

If it is incorrect -- what partition should it be? Are you compiling the 
kernel on the same system you are trying to boot it on? What happens if you 
specify the correct partition at the lilo (or grub or whatever you use for 
a bootloader) prompt? Are you booting from hda?


>Did you copy over your /usr/src/linux/System.map file into /boot? Also,
>did you build an initial ramdisk via mkinitrd? A lot of times that last
>step is overlooked but is necessary because it loads the initial drivers
>needed to mount the hard disk partitions.

No it's not. It is only necessary if the kernel does not have ide support 
compiled in (not usual) or dos not have support for your filesystem type 
compiled in (again unusual, if the filesysystem is ext2). Typical, 
"vanilla" systems do not need the initrd step to boot/init.

> > I run the Debian woody release.

[rest omitted]



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Re: kernel compilation problem

[joy]

Sorry to find a trivial answer to the Q. The settings were alright .
thanks a lot , Jason and Ray, All I needed to do was to to copy the
System.map as this Kernel does not use the other two System.map(s)  in
/boot (they are for kernels compiled with diff options).
But still ,I would like to get rid of the irritating
              spurious 8259A interrupt : IRQ7
message I get on Boottime.
I run an athlon 2400+ , with a biostar nforce2 mobo and the normal
peripherals, nothing out of the ordinary.


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Re: kernel compilation problem

[Beolach]

joy wrote:
> Sorry to find a trivial answer to the Q. The settings were alright .
> thanks a lot , Jason and Ray, All I needed to do was to to copy the
> System.map as this Kernel does not use the other two System.map(s)  in
> /boot (they are for kernels compiled with diff options).
> But still ,I would like to get rid of the irritating
>              spurious 8259A interrupt : IRQ7
> message I get on Boottime.
> I run an athlon 2400+ , with a biostar nforce2 mobo and the normal
> peripherals, nothing out of the ordinary.
> 

The spurious 8259A interrupt error is an incredibly common and 
non-dangerous error message.  Most likely it is caused by the 
uniprocessor APIC (Advanced Programmable Interupt Conrtoller) linux 
code.  It's really not dangerous or bad or anything.  But if you really 
do want to get rid of it, try recompiling the kernel without 
uniprocessor APIC support ("Local APIC support on uniprocessors" in make 
menuconfig).  This should get rid of the message.

A couple good references for this issue are: 
<http://www.linuxchix.org/pipermail/techtalk/2002-August/012697.html>

and this thread on the LKML (Linux Kernel Mailing List):
<http://www.cs.helsinki.fi/linux/linux-kernel/2001-47/0697.html>

HTH,
Conway S. Smith

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RE: kernel compilation problem

[Pacheco Jason NPRI]

> The spurious 8259A interrupt error is an incredibly common and 
> non-dangerous error message.  Most likely it is caused by the 
> uniprocessor APIC (Advanced Programmable Interupt Conrtoller) linux 
> code.  

I blame the sunspots...
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RE: kernel compilation problem

[Pacheco Jason NPRI]

>       Hi,
> I was compiling the 2.4.18 kernel as a practice run and when I booted 
> thru it I recieved a message during boottime:
> Kernel panic: VFS unable to mount root fs on 03:05.
> any clues why?

Did you copy over your /usr/src/linux/System.map file into /boot? Also,
did you build an initial ramdisk via mkinitrd? A lot of times that last
step is overlooked but is necessary because it loads the initial drivers
needed to mount the hard disk partitions.

> I run the Debian woody release.
> also when I boot thru my working kernel, I get a message 
> during boottime:
> spurious 8259A interrupt : IRQ7
> any ideas?

I just recently built my first Debian system and I get the same error,
except I think the number is different. The system was a junk testbed, so
I figured it was my piece of garbage mobo, which his a Soyo K7ADA+. Anyway,
the error doesn't seem to cause a problem other than having that annoying
message popup here and there, but I would like to figure out how to solve
it as well.
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kernel compilation problem

[joy]

      Hi,
I was compiling the 2.4.18 kernel as a practice run and when I booted 
thru it I recieved a message during boottime:
Kernel panic: VFS unable to mount root fs on 03:05.
any clues why?
I run the Debian woody release.
also when I boot thru my working kernel, I get a message during boottime:
spurious 8259A interrupt : IRQ7
any ideas?
thanx in advance,
Joy.M.M

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