root@breadboard# foo ethrcv
[   12.901] breadboard kernel: ENCx24: beginning power-on self test
[   12.908] breadboard kernel: ENCx24: SPI interface up (attempt 1)
[   12.914] breadboard kernel: ENCx24: Waiting for PLL lock
[   12.920] breadboard kernel: ENCx24: Requesting system reset
[   12.927] breadboard kernel: ENCx24: System reset completed
[   12.933] breadboard kernel: ENCx24: Setting EUDAND to 0x4000
[   12.939] breadboard kernel: ENCx24: Setting ERXST to 0x4000
[   12.945] breadboard kernel: ENCx24: Setting ERXTAIL to 0x5FFE
[   12.952] breadboard kernel: ENCx24: setting MTU to 1518
[   12.960] breadboard kernel: foo: Our MAC address is 00:04:00:00:a3:16
[   12.965] breadboard kernel: ENCx24: Enabling packet receive mode
[   17.982] breadboard kernel: ENCx24: Reading a packet
[   17.988] breadboard kernel: ENCx24: Looking up packet address
[   17.995] breadboard kernel: ENCx24: Next packet address is 0x40be
[   18.001] breadboard kernel: ENCx24: Reading RSV
[   18.008] breadboard kernel: ENCx24: RSV is b5 00 c0 03 60 00
[   18.013] breadboard kernel: ENCx24: Packet is 181 bytes long
[   18.050] breadboard kernel: ENCx24: Updating ERXTAIL
[   18.055] breadboard kernel: ENCx24: Setting PKTDEC
Got a 181-byte packet!
Destination MAC address: ff:ff:ff:ff:ff:ff
Source MAC address: e0:cb:4e:60:06:8a
Frame type: IP (0x0800)
IP version: 4
Header length: 5 32-bit words
DSCP: 0
ECN: 0
Size: 163
ID: 0x0
Flags: 0
  Evil bit:       0
  Don't fragment: 0
  More fragments: 0
Fragment offset: 16384
TTL: 64
Protocol: 0x11 (UDP)
Header checksum: 0x2641 (not validated)
Source IPv4 address: 10.2.0.6
Dest IPv4 address: 10.2.255.255
Source port: 631
Dest port: 631
Length: 143
Checksum (not validated): 55711
38 32 31 30 30 36 20 33 20 69 70 70 3a 2f 2f 31 30 2e 32 2e 30 2e 36 3a 36 33 31 2f 70 72 69 6e
74 65 72 73 2f 48 4c 32 31 34 30 20 22 22 20 22 48 4c 32 31 34 30 22 20 22 42 72 6f 74 68 65 72
20 48 4c 32 31 34 30 20 66 6f 72 20 43 55 50 53 22 20 6a 6f 62 2d 73 68 65 65 74 73 3d 6e 6f 6e
65 2c 6e 6f 6e 65 20 6c 65 61 73 65 2d 64 75 72 61 74 69 6f 6e 3d 33 30 30 20 6d 69 72 72 6f 72
3d 66 61 6c 73 65 0a db 06 fa 7d 34 30 33 30