Dear all, We are customizing U-boot for the embedded planet ep8260 reference board. I am working on customizing Ethernet in Uboot. The ep8260 reference board has the LXT971 Fast Ethernet chip. After customizing the code for Ethernet i tried doing an external Loop back test. Changes i made in the function u-boot-1.1.1/cpu/mpc8260/ether_fcc.c/eth_loopback_test(void)->

1.I changed the FCC to FCC3: #define FCC_START_LOOP 2 #define FCC_END_LOOP 2

2.I added a few extra printf for debugging purpose.

After connecting my board to the HyperTerminal and giving the command "elbt" i see the following messages: **************************************************************************** *** Net: FCC3 ETHERNET BEDBUG:ready => elbt FCC Ethernet External loop back test Initialize FCC channels: 2inside transmit: values are aa inside transmit

: Value are bb inside transmit: value are cc inside transmit: value are dd

done Starting test... (Ctrl-C to Finish) ecp->state=Runningecp->state=closingHELLO EVERYONE..Just before Closed Inside Clo

sedTest Finished in 2364ms (plus 1000ms close wait period)!

received da received data is ff received data is ff received data is ff Channel 2: 4 rcvd (1 pps, 4 rxerrs), 4 sent (1 pps, 0 txerrs)

First 4 rx errs: 0c80 0c80 0c80 0c80

Receive Error Counts: Channel 0 Channel 1 Channel 2

Not Last in Frame 32701792 0 0

Not First in Frame 33180376 25 0

Address Miss 25 0 0

Broadcast Address 32702316 32965304

Multicast Address 0 32965328 0

Frame Length Violation 11 1 0

Non-Octet Alignment 0 0 0

Short Frame 0 113 0

CRC Error 1 7103092 0

Overrun 0 0 0

Collision 0 0 0

Bad Src Address 0 0

Bad Frame Type 0 0 0

Bad Frame Length 0 0 0

Data Compare Errors 33308296 0 0

Transmit Error Counts: Channel 0 Channel 1 Channel 2

Defer Indication 32701792 0 0

Heartbeat 33180376 25 0

Late Collision 25 0 0

Late Collision 25 0 0

Retry Count 0 32965328 0 Underrun 11 1 0 Carrier Sense Lost 0 0 0

RMON(-like) Counters: Channel 0 Channel 1 Channel 2 CRC Errors 33171496 0 0 Alignment Errors 0 0 0 Discarded Frames 32702316 0 0 Octets 0 2 4096 Collisions 2 0 0 Broadcast Frames 32702064 0 4 Multicast Frames 32702032 0 0 Undersize Frames 32965064 0 0 Fragments 32702316 2 0 Oversize Frames 33321116 0 0 Jabbers 0 25 0 64 Octet Frames 32702016 0 0 65-127 Octet Frames 33191720 0 0 128-255 Octet Frames 0 0 0 256-511 Octet Frames 2 0 0 512-1023 Octet Frames 32702064 2 0 1024-1518 Octet Frames 32702032 25 4 => **************************************************************************** ********************* The value I have given for patbytes is : patbytes[ELBT_NTXBD] = {0xaa, 0xbb, 0xcc, 0xdd }; But when i see the received bytes on the HyperTerminal by giving a printf for the received bytes after the printf which says "Test Finished" I get the following result in the received data:

received da received data is ff received data is ff received data is ff Channel 2: 4 rcvd (1 pps, 4 rxerrs), 4 sent (1 pps, 0 txerrs)

Can anyone please tell me how i can remove the 4 rxerrs and get the same data that i have transmitted.

Thanks & Regards, Vikrant Basotra. ************************************************************************** This email (including any attachments) is intended for the sole use of the intended recipient/s and may contain material that is CONFIDENTIAL AND PRIVATE COMPANY INFORMATION. Any review or reliance by others or copying or distribution or forwarding of any or all of the contents in this message is STRICTLY PROHIBITED. If you are not the intended recipient, please contact the sender by email and delete all copies; your cooperation in this regard is appreciated. **************************************************************************