Hello
First to boot from an USB drive, you need to have a BIOS that support it.
Then for Lilo or grub, you just need to change your "root=" option. But if you just do that, you'll probably have a "VFS: unable to mount.... Kernel Panic". To avoid that you need to patch your kernel or add a pause in the boot process to be sure that USB will be enable in the kernel when it will try to mount USB root filesystem.
Oliv'
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