I am trying run the DP83848C in my hardware. After configuration under linux the ping command fails:

# ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:00:00:00:00:00
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:21 Base address:0x4000

# ifconfig eth0 hw ether 00:11:22:33:44:55
# ifconfig eth0 192.168.0.20
eth0: link down
# eth0: link up, 100Mbps, full-duplex, lpa 0x45E1

# ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:11:22:33:44:55
inet addr:192.168.0.20 Bcast:192.168.0.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:21 Base address:0x4000

# ping 192.168.0.1
PING 192.168.0.1 (192.168.0.1): 56 data bytes
Illegal instruction
#

any idea?