Open source implementation of the program ELFDwT that is included in the Keil uVision tool package.
This tool calculates the checksum of the first 7 words of the vector table and sets it at address 0x0000001c of the elf file. This is needed for some cortex-m mcu's. For example the NXT LPC802.
This tool was created with information from the document LPC Boot ROM checksum from the NXP community page (this document)
⚠️ Currently only targets with little endian are supported