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I want to manually add the Slackware entry into the GRUB2 configuration file /boot/grub/grub.cfg. But the problem is that there is no initrd or initramfs present in /boot directory of Slackware. I saw that there is some utility named mkinitramfs which generates the initramfs, but I don't know how to use it for a kernel which is not running and is placed at a particular folder. Can somebody please help me out in solving my problem.

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I don't know slackware but an initramfs is optional depending on your kernel you may not need one. – Ulrich Dangel Jul 23 '12 at 19:15

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Note that Lilo is the default Slackware bootloader, although you can find a Grub package in the extra directory of your Slackware DVD.

The command that you want to use is mkinitrd (housed in /sbin). You can use the following command to make an initrd.gz for your bootloader: mkinitrd -c -k 3.2.23 -m ext3 -f ext3 -r /dev/sdb3 The exact kernel version is set by -k. The mkinitrd man page has all the documentation and there is also a helpful bit of documentation in: /boot/README.initrd.

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Actually I didn't install lilo as well as grub during installation time, that's why i an not able to boot Slackware. Later I installed grub using one rescue disk..Can't I generate initrd for Slackware kernel by booting through rescue disk of Ubuntu. – pradeepchhetri Jul 24 '12 at 4:12
@pradeepchhetri: you can use the Slackware install disc to boot into a text-only rescue system, the start screen tells you about the parameters. – Ulrich Schwarz Jul 24 '12 at 4:31
@UlrichSchwarz: ok ok ...i understood thanks a lot... – pradeepchhetri Jul 24 '12 at 4:50
@pradeepchhetri Start by booting with Slackware's huge kernel. Once that is working, you can fine tune your boot to use a 'regular' kernel. – SigueSigueBen Jul 24 '12 at 13:30

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