[U-Boot] LXT972 issue on MPC8247: tx error

[Sauce.Cheng]

my code run on the board reveal the info as following:

Board: Motorola MPC8272ADS
DRAM:  32 MB
FLASH: 512 kB
In:    serial
Out:   serial
Err:   serial
Net:   FCC1 ETHERNET
bb_miiphy_write()
Hit any key to stop autoboot:  0 
=>

after i enter words like "ping 192.168.0.100",show something like this
PS. the line start as "chengmo" are debug infos 

chengmo : fec_init
chengmo 0 : rtx.txbd[0].cbd_sc : 00004c00
chengmo 1 : rtx.txbd[1].cbd_sc : 00004c00
Using FCC1 ETHERNET device
chengmo : fec_send
chengmo_b : rtx.txbd[0].cbd_sc : 00004c00
chengmo_a : rtx.txbd[0].cbd_sc : 0000ec00
fec: tx error
chengmo : fec_send
fec: tx buffer not ready
ping failed; host 192.168.0.100 is not alive

eventually, show me that "fec: tx buffer not ready."
this prompt is in fec_send() in ether_fcc.c

i am not sure that at which the mistake happened, because the flow of
initializing is:

eth_initialize() => phy_reset()

in eth_initialize(), insert the struct into the list of devices.

phy_reset(), emulates MII transmit something to PHY, is it right? here i am
not sure about it.

after i input PING command, it will run by sequence fec_init(), fec_send()

in fec_init(), configure some register about FCC, and setup ethernet buffer
discriptors and allocate space for buffer used by Tx and Rx, then initialize
Parameter RAM. that' all, something wrong ?

where the mistakes could happen ? i really cant find it.
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