Hi,
Which LPCXpresso version are you using? Please try using the latest version.
Earlier, the LPCXpresso IDE created automatically memory maps to match the target MCU and select an appropriate flash driver for MCUs containing internal flash.
From LPCXpresso IDE 8.0, there is extended support for the creation and programming of projects that span multiple flash devices. Previously only a single (default) flash driver could be specified for a project; now it is possible to specify a flash driver for each region of flash memory.
Please check the following FAQ for more reference about creating projects using multiple banks of flash memory
into different FLASH blocks
Have a great day,
Sol
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