Hi,
 
I compile the L4Linux with plain mode! But when I boot L4Linux it is wrong. The information is as following:

RNGR: Stage1
loading (hd0,1)/boot/fiasco_L4/sigma0
loading kernel (hd0,1)/boot/fiasco_L4/main -nowait -nokdb -erial_esc -compseed
The module
00:00300000-00390408: (hd0,1)/boot/fiasco_L4/main -nowait -nokdb -serial
overlaps with module loaded by bootloader at
00100000-001caec0: RMGR
00:0020f000-002661ac: (hd0,1)/boot/fiasco_L4/main -nowait
01:00267000-00275925: (hd0,1)/boot/fiasc_L4/sigma0
==>02:00276000-004d8950: (hd0,1)/boot/fiasco_L4/vmlinuz.V2 no-scroll no
03:00409000-014d9000:(hd0,1)/boot/fiasco_L4/drops-rd.rd

The grub about L4Linux is :
title fiasco_L4Linux
root (hd0,1)
kernel (hd0,1)/boot/fiasco_L4/rmgr -sigma0 task modname "vmlinuz" module
 
I am not sure whether it can solve all your problems, but there is an obvious error at this line: "vmlinuz" should be "vmlinuz.V2".
 
"modname "vmlinuz.V2" module" means that the next module (here, drops-rd.rd) after "vmlinuz.V2" is a module of "vmlinuz.V2"

modaddr 0x02000000
module (hd0,1)/boot/fiasco_L4/main -nowait -nokdb -serial_esc -comspee d 115200 -comport 1
module (hd0,1)/boot/fiasco_L4/sigma0
module (hd0,1)/boot/fiasco_L4/vmlinuz.V2 no-scroll no-hlt l4irqack=linux load_ramdisk=1 ramdisk_size=16384 root=/dev/ram
module (hd0,1)/boot/fiasco_L4/drops-rd.rd