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Code update through EEPROM

Hi,

i am planning to work on secondary bootloader using IAP to update code from extrnal EEPROM on I2C.
In order to do that, i first need to write the code(may be hex file) in to EEPROM.
I know how to write some data to EEPROM but i am confused about what file needs to be written to EEPROM if i had to use it for firmware update of ARM7 LPC2138.

Is it a hex file of that firmware or some other file and should i write that to eeprom as it is or with some modification or what..?

Regards,
Salman.