No configuration methods succeeded

[Jared.lin]

Hi All,
I'am working on build up a iPXE function in BIOS with Intel I210 Lan chip, .efidrv iPXE format.
Every time when I reboot the system, dhcp connection will fail and shows as below:
iPXE 1.0.0+ (41a9a) -- Open Source Network Boot Firmware -- http://ipxe.org
Features: DNS HTTP iSCSI TFTP AoE EFI Menu
iPXE> dhcp
Waiting for link-up on net0... ok
Configuring (net0 00:90:fb:6b:08:52).................. No configuration methods succeeded (http://ipxe.org/040ee186)
iPXE> ifstat
net0: 00:90:fb:6b:08:52 using i210 on 0000:03:00.0 (closed)
[Link:up, TX:4 TXE:0 RX:0 RXE:0]
If I call dhcp again immedicate, it's works.
iPXE 1.0.0+ (41a9a) -- Open Source Network Boot Firmware -- http://ipxe.org
Features: DNS HTTP iSCSI TFTP AoE EFI Menu
iPXE> dhcp
Waiting for link-up on net0... ok
Configuring (net0 00:90:fb:6b:08:52).................. No configuration methods succeeded (http://ipxe.org/040ee186)
iPXE> ifstat
net0: 00:90:fb:6b:08:52 using i210 on 0000:03:00.0 (closed)
[Link:up, TX:4 TXE:0 RX:0 RXE:0]
iPXE> dhcp
Configuring (net0 00:90:fb:6b:08:52)...... ok

There is no problem if I build up a .efi iPXE format. I was wondering if there is anything I missed to build up a .efidrv iPXE file? Thanks.