Server did not respond on rx2600

[esstee]

Hi,
While netbooting rx2600 machine, i am getting the following message on the PXE client
"PXE - E18: Timeout. Server did not respond".
I am able to pxe boot 32-bit machine. but while doing the same on this rx2600 machine, i am getting this problem. Anyone can help me to resolve this. dhcp and tftp services are working fine.
sample dhcp and tftp conf. files
dhcp.conf
ddns-update-style interim;
ignore client-updates;
allow booting;
allow bootp;

subnet 192.1.45.0 netmask 255.255.255.0 {
option subnet-mask 255.255.255.0;

range 192.1.45.10 192.1.45.13;
default-lease-time 21600;
max-lease-time 43200;

host "PXEclient mac address"{
hardware ethernet ;
fixed-address 192.1.45.26;
filename "ia64/elilo.efi";
}
}

tftp
service tftp
{
socket_type = dgram
protocol = udp
wait = yes
user = root
server = /usr/sbin/in.tftpd
server_args = -s /tftpboot
disable = no
port = 69
per_source = 11
cps = 100 2
flags = IPv4
}

[esstee]

able to resolve this issue. forgot to add server-name in the dhcp configuration.