Booting Debian ISO with grub2 and a separate Kernel

[praka123]

Hello ,
I am trying to install Debian using debian netinstall cd(~160mb) with debian-installer.the cd boots into tmpfs.

it cannot mount My ext4 partition.it errs out:

mount:mounting /dev/sdb7  on /debiancd failed: No such device

I cannot see ext3/ext4 modules in kernel modules directory.it contains only isofs and fat modules.Is this the Problem?
--
I want to try booting ISO with Another Kernel outside ISO.ie vmlinuz,initrd.gz extracted from a working installation and make grub2 to use this kernel to boot as well as continue the ISO loop mounted, to Boot.
Currently,below is the menuentry on grub2:

menuentry "Debian ISO on /dev/sdb7" {
insmod ext2
set root=(hd0,7)
loopback loop /debian-testing-amd64-netinst.iso
linux (loop)/install.amd/vmlinuz boot=install.amd iso-scan/filename=/debian-testing-amd64-netinst.iso noeject noprompt --
initrd (loop)/install.amd/initrd.gz
}

^^^^ How Can I make Another Kernel to Boot For this Debian ISO?

Thank You

[hatebreed]

I think you could add the kernel to the iso file. then just change it accordingly in your grub menu.