After IAR released EWARM version 4.20A, one of my colleagues discovered a bug in their flash programming for the LPC chips. It will not let you program the last sector of flash (the one before the bootloader). IAR has posted a fix (as well as flash programming support for LPC2138) in the Technical Support section of their website. (Select IAR Embedded Workbench Support, search for reference number 50187.) Thanks H.S.
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IAR Flash Programming
2005-02-17 by lp2000c