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Please Help: Ethernet bootloader problem in LM3S8962



Hi:
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I have a problem when tried to use the demo binary file (boot_eth.bin) from stellariswares version 7611 Ethernet bootloader in EK-LM3S8962-C board.
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(1) Connect EK-LM3S8962-C board with Ethernet cable and USB cable to PC.
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(2) Using the LM Flash Programmer and select the LM3S8962 Evaluation board then program the file 
C:\StellarisWare\boards\ek-lm3s8962\boot_eth\ccs\Debug\boot_eth.bin
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(3) Using the LM Flash Programmer and select the “Manual Configuration” with interface “Ethernet”, set the MAC address and pick the Ethernet adapter, then use the Ethernet cable to program the bootloader demo program.
C:\StellarisWare\boards\ek-lm3s8962\boot_demo_eth\ccs\Debug\ boot_demo_eth.bin
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It works fine in step 3 to use the Ethernet to update the code, but it fail after repeat step 3 to do the same update from Ethernet.
Please advice how to solve the problem.
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I have tried the same procedure to test DK-LM3S9B96 board in Ethernet bootloader with stellarswares 7611 demo. It works fine with Ethernet update.
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Thanks
Eric