Installing u-boot on sbc8260 via ethernet using minicom

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i've tryed to install u-boot using minicom, but i'm not able to 
configure in shell boot params, 
using this...

boot device          : motfcc
unit number          : 0
processor number     : 0
host name            : motfcc0
inet on ethernet (e) : 192.168.0.4
inet on backplane (b): 192.168.0.4
host inet (h)        : 192.168.0.3
gateway inet (g)     : 192.168.0.3
flags (f)            : 0x80
target name (tn)     : sbc8260

when i reboot target it appears in minicom the message below:

AT S7=45 S0=0 L1 V1 X4 &c1 E1 Q0
0x1f058b0 (tBoot): miiPhyInit check cable connection
Attached TCP/IP interface to motfcc0.
Warning: no netmask specified.
Attaching network interface lo0... done.
Loading... Erroneous header read

Error loading file: errno = 0x610001.
Can't load boot file!!
ü

my questions are?
what file must i put into target?(u-boot.bin?)
in which way can i upload it?(using tftp with 192.168.0.4 and using 
put command, it gives timeout for transmission, but ping to 
192.168.0.3 
works normally until in minicom appears error message)

Please help me to configure and install u-boot
thanks very much!!!


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