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That may be possible.  However, is it possible to answer the questions:
Does FlashMagic work currently using a serial interface to the LPC1768? 
Is flow control necessary?

Thanks,

I have been working on a serial bootloader for the LPC1768 Eval Board from IAR by modifying the Ethernet Bootloader example from FlashMagic to ensure the Protocol is intact.  I installed a COM port monitoring tool, Portmon to look at the PC-> UART traffic during the FlashMagic download and I see the transactions between the LPC1768 and FlashMagic as follows:

? <-- From FlashMagic
Sychronized <-- From my firmware on LPC1768 Eval Board
Synchronized <-- From FlashMagic
OK <-- From my firmware on LPC1768 Eval Board

After the last OK I send I do not get any more data from FlashMagic.  In the Portmon log, I do see some handshaking going on after I send this OK.  Is handshaking required for FlashMagic when programming via COM ports?  I am using UART0 on the LPC1768 Eval Board, which has no handshaking.

The error displayed by Flash Magic is:

Unable to connect at specified baud rate. Try reducing the baud rate. (failed to autobaud - step 2) Reset teh hardware into ISP mode again.

I am connected at 9600 Baud.

Thanks