Hello,
I have few questions about the boot process in the LPC55S69. Although I understand the different boot options (i.e. secure/non-secure and the different types of secure boot) I am having a few issues understanding some of the details of the boot process in general.
I have taken a look at the datasheet (UM11126) and some of the application notes to try and help me understand. As far as I have understood it, you have to program a boot image and store it into boot ROM. Right? There is no boot sequence that is permanently stored in the device and used if you don't provide a custom boot image. You can program the controller despite not loading a designated boot image into it when you first receive the board. How does the Microcontroller initially boot then? Is a boot image loaded into the controller before it leaves the factory?
A customized boot image is stored in the boot ROM. Correct? Is that the only place you can put it or can it also be stored in other parts of the flash. I looked at Ch. 6 Boot ROM of the UM11126 datasheet to try to understand this. The image header has a field called imageExecutionAddress (UM11126, Table 172). Is this where the start address of where the rest of the boot commands is stored (if they are stored in the flash but outside of the designated boot ROM region)?
Thank you in advanced for your help.
Best Regards,
Leah
