No idea, as it never crashed on me :-)
You can still try to boot the installed system (with some limitations), and run mkzimage. Just download the
inst32 mentioned a few posts earlier, and boot it without any command line arguments. It should ask for a CD, and then you should be in a menu. There you can find 'boot installed system' in one of the sub menus. Choose /dev/sdb4. There will be some warning messages, that kernel modules can't be loaded, you can safely discard them. Once logged in as root, you can create a bootable kernel by:
Code:
cd /boot
mkzimage --vmlinux vmlinux --initrd initrd --output zImage
Then reboot, and you should be able to start the system with
Code:
boot hd0:3 boot/zImage
You'll need to repeat the mkzimage stuff each time you upgrade the kernel (I also tend to make a backup of /boot/zImage, but I never had to use it :-) )