Content originally posted in LPCWare by TheFallGuy on Tue Mar 10 07:44:09 MST 2015
You must have misunderstood the manual.
There is a boot ROM in the chip. This is ROM and is impossible for you to change.
For a flashless part, such as the LPC4370, you have to use external flash to store your code. There is an alternative of booting from USB using DFU, where code is downloaded to internal RAM - but you need a host connected to USB so that it can dfu-boot your device.
Maybe you want to use one of the parts with internal flash, such as the LPC4357?