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CCS/F28M35H52C: RAM to FLASH changes Ethernet uip

Part Number: F28M35H52C

Tool/software: Code Composer Studio

Hi,

I have a code that uses the ethernet uip example. It works perfectly in RAM but when I pass to Flash, it doesn't work more. It stops in this function:

// Wait for the previous transmission to be complete.
while(HWREGBITW(&g_ulFlags, FLAG_RXPKTPEND) == 1)
{
}

This part is inside the EthernePaketGetDMA function. I saw in the WireShark but any package is received anymore.

But there is a time that I started the code and it continously send:

00:00:00_00:00:00 00:00:00_00:00:00 0x0000 60 Ethernet II

Can anyone help me? 

thank you