Dan thanx for your answer !!
Is it ok like this :
[root@sgtserver lilo.conf]# cat /etc/lilo.conf
#------------------------------------------------------------
# DO NOT MODIFY THIS FILE! It is updated automatically by the
# e-smith server and gateway software. Instead, modify the source
# template in the /etc/e-smith/templates directory. For more
# information, see
http://www.e-smith.org.
#
# copyright (C) 1999, 2000 e-smith, inc.
#------------------------------------------------------------
boot=/dev/hda
map=/boot/map
install=/boot/boot.b
prompt
timeout=50
message=/boot/e-smith.pcx
linear
default=esmith
image=/boot/vmlinuz-2.2.19-7.0.8smp
label=esmith
read-only
root=/dev/hda6
append ="mem=1536M"
image=/boot/vmlinuz-2.2.19-7.0.8
label=esmith-up
read-only
root=/dev/hda6
#------------------------------------------------------------
# TEMPLATE END
#------------------------------------------------------------