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LPC1778 can't start from any IROM Address only 0x0

Dear All,

I use LPC1778 and try to divide internal flash memory for my handmade bootloader and firmware.
And when i set another IROM1 start address for my firmware (for example 0x1000) i see SWD Communication Failure message in window "Building Output". After that i can't debug or update my mcu. Can use only ISP.
Why changing IROM1 start address is stopping MCU?
What i have to do to run my code from any address?
P.S. When i use LPC2367 there is no these problems.
P.P.S. My version 4.53

I trying apply RAM_MODE, REMAP commands for my startup file. But doesn't work.
With best regards, Vladimir.

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