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Uploading NK.bin over eboot stops for some reason

Hello,

we've a board (AM335x, EC7 BSP) where the ethernet phy is the IP1001 from IC+. It works so far, but the upload stops:

Download file information:
-----------------------------------------------------------
[0]: Address=0x80008000  Length=0x02627bbc  Save=0x80002000
-----------------------------------------------------------
Download file type: 1
+OEMIsFlashAddr(0x80008000) g_eboot.type 1
 <> Record [ 0 ] dwRecAddr = 0x80008000, dwRecLen = 0x4
. <> Record [ 1 ] dwRecAddr = 0x80008040, dwRecLen = 0x8
. <> Record [ 2 ] dwRecAddr = 0x80008048, dwRecLen = 0x4
. <> Record [ 3 ] dwRecAddr = 0x80009000, dwRecLen = 0x23000

I sniffed the ethernet packets and see that the last answer from the target (192.168.254.13) was:

26    42.092664    192.168.254.227    192.168.254.13    UDP    1070    Source port: 2314  Destination port: 980
27    42.095052    192.168.254.13    192.168.254.227    UDP    60    Source port: 980  Destination port: 2314

Then the host transmits the same frame (26) again and again, but no answer  from the target?!

I haven't the EVM on hand to verify the problem, but has anyone an idea, what could lead to such a behavior?

Thanks ahead!