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Dell PE 2850 and installation problem

Hi all,

I try to installing Debian AMD64 on Dell PE 2850-Xeon 64bit.
Debian not recognize my RAID controller because megaraid2 driver not
take part in amd64 cd.
I install debian in external USB storage and compile kernel 2.6.12
with megaraid drivers.
I edit menu.1st 

title           Debian GNU/Linux, kernel 2.6.8-11-em64t-p4-smp Default
root            (hd0,1)
kernel          /boot/vmlinuz root=/dev/sda2 ro console=tty0
initrd          /boot/initrd.img

title           Kernel-2.6.12-Leoman-em64t-smp
root            (hd0,1)
kernel          /boot/vmlinuz-2.6.12-Leoman-em64t-smp root=/dev/sda2
ro console=tty0

and re-install grub.

I reboot to machine and boot loader says;
VFS: cannot open root device "sda2" unknown-block(0,0)
Please append a correct "root=" boot option 
Kernel Panic - not syncing: VFS: to mount root fs on unknown-block(0,0)

I think change device address. 
I try boot old kernel and add a this line;
(hd2)    /dev/sdc 
(because attached two scsi disk on machine) 
and change menu.1st
title           Kernel-2.6.12-Leoman-em64t-smp
root            (hd2,1)

re-install grub and reboot 

grub says; no disk and patition

How can i resolve this problem?


Leoman HEDE
Bi bok deil kendisi

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