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Raw Ethernet Sockets cannot receive after about 10 minutes

Other Parts Discussed in Thread: AM3359

i use sys/bios and ndk.

i find a problem, i use PC to send a raw packet to my arm3359, when i receive the packet , i send it back to PC.

when my PC send a packet every 10ms, i find about 10 minutes later, my am3359 does not respond to my PC.

then i check my program,i find out that my recvnc() did not return.

so i set a breakpoint at  Cpsw_HwIntRx(void *a), i did receive a packet in this function correctly.

i wonder why ndk did not respond after 10minutes when i did receive a packet in  Cpsw_HwIntRx()??