[syslinux] Bootable CD for booting of USB HDD

[Shocky]

Hi,

I bought a USB hard drive, got Mandriva installed on it, and made it bootable 
with extlinux. Works great on machines that can boot from USB. I also created 
a boot cd using the instructions in the wiki. This is working too.

The only problem with the boot cd is that I had to copy the kernel, initrd, 
etc. to the cd. This means that whenever I install a new kernel I'll have to 
create and burn a new cd image. Not so burdensome I can't live with it if 
there's no better way.

But I'm wondering if there is a way to get the cd to tell the computer to boot 
using the kernel on the usb drive. Is such a thing possible?

On a related note, it doesn't seem that isolinux can use the boot menu like 
extlinux. At least I couldn't get it to work. Is this a limitation on booting 
from cd or was I just doing something wrong again? I started by copying over 
my working extlinux.conf to isolinux.cfg, along with the vesamenu.c32 file 
that it references, but it seemed to ignore it.

Thanks,
Shocky
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