Xen users - Jul 2006 - Creating a custom kernel configuration?

Hi,

I''m trying to build a Xen system using the latest xen-3.0-testing
package, and to be able to boot the system some support for RAID devices
and special network cards has to be configured.

The process I''ve used earlier is "make world; make install",
however,
that produces a kernel that exits with a panic as it cant find the root
device.

I''ve also tried modifying the linux-defconfig_xen_x86_32 file in
buildconfigs, but when I do that the following message appears under
"make world":

if [ -r System.map -a -x /sbin/depmod ]; then /sbin/depmod -ae -F
System.map -b /root/packages/files/xen-3.0-testing/dist/install -r
2.6.16.13-xen; fi
make[4]: Leaving directory
`/root/packages/files/xen-3.0-testing/linux-2.6.16.13-xen''
make -C linux-2.6.16.13-xen ARCH=i386
INSTALL_PATH=/root/packages/files/xen-3.0-testing/dist/install vmlinuz
make[4]: Entering directory
`/root/packages/files/xen-3.0-testing/linux-2.6.16.13-xen''
make[4]: *** No rule to make target `vmlinuz''.  Stop.
make[4]: Leaving directory
`/root/packages/files/xen-3.0-testing/linux-2.6.16.13-xen''
make[3]: *** [build] Error 2
make[3]: Leaving directory `/root/packages/files/xen-3.0-testing''
make[2]: *** [linux-2.6-xen-install] Error 2
make[2]: Leaving directory `/root/packages/files/xen-3.0-testing''
make[1]: *** [install-kernels] Error 1
make[1]: Leaving directory `/root/packages/files/xen-3.0-testing''
make: *** [world] Error 2

Anyone know what I can do to get the kernels configured?

Thanks,

Morten

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On Thu, Jul 27, 2006 at 04:04:02AM +0200, Morten W. Petersen
wrote:
> Hi,
> 
> I''m trying to build a Xen system using the latest xen-3.0-testing
> package, and to be able to boot the system some support for RAID devices
> and special network cards has to be configured.
> 
> The process I''ve used earlier is "make world; make
install", however,
> that produces a kernel that exits with a panic as it cant find the root
> device.
You''re probably missing the initrd required to mount the root
filesystem.   For example I have the following in my menu.lst file:
---
title Xen 3.0.2 / XenLinux 2.6.16
root (hd0,0)
kernel /xen.gz dom0_mem=131072 com1=9600,8n1
module /vmlinuz-2.6.16-xen root=/dev/hda3 ro console=ttyS0
module /initrd.img-2.6.16-xen
---

The correct way to make the initrd depends on your distributions but it
typically looks some thing like:
# mkinitrd -o /boot/initrd.img-2.6.16-xen 2.6.16-xen

Yours Tony

   linux.conf.au       http://linux.conf.au/ || http://lca2007.linux.org.au/
   Jan 15-20 2007      The Australian Linux Technical Conference!


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Hi Tony,
> You''re probably missing the initrd required to mount the root
> filesystem.   For example I have the following in my menu.lst file:
> ---
> title Xen 3.0.2 / XenLinux 2.6.16
> root (hd0,0)
> kernel /xen.gz dom0_mem=131072 com1=9600,8n1
> module /vmlinuz-2.6.16-xen root=/dev/hda3 ro console=ttyS0
> module /initrd.img-2.6.16-xen
> ---
> 
> The correct way to make the initrd depends on your distributions but it
> typically looks some thing like:
> # mkinitrd -o /boot/initrd.img-2.6.16-xen 2.6.16-xen
OK, I''ve setup the following grub configuration

title           Debian GNU/Linux, kernel 2.6.16-xen
root            (hd0,0)
kernel          /boot/xen-3.gz
module          /boot/vmlinuz-2.6.16-xen root=/dev/sda1 ro console=ttyS0
module          /boot/initrd.img-2.6.16-xen
savedefault
boot

where the kernel is created directly from ''make world; make
install'' and
the initrd image as you describe above.

However, I get an error message (screendump attached).  Got any ideas of
what''s going on there?  It doesn''t know the filesystem type
devfs..

-Morten


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2006/7/27, Morten W. Petersen
<morten@nidelven-it.no>:
> Hi Tony,
>
The same problem for me with Debian. In my case I see during boot that
megaraid module for RAID device is not loaded. Devfs is powered from
Kernel Automounter daemon...

A way to solve?

Ste

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Stefano Cislaghi wrote:
> 2006/7/27, Morten W. Petersen <morten@nidelven-it.no>:
>> Hi Tony,
>>
> 
> The same problem for me with Debian. In my case I see during boot that
> megaraid module for RAID device is not loaded. Devfs is powered from
> Kernel Automounter daemon...
> 
> A way to solve?
I managed to get a server running by using yaird instead of mkinitrd for
the ramdisk image and specifying *MEGARAID*=y in the
buildconfigs/linux-defconfig_xen_x86_32 file.

-Morten

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