Hello everyone.
I have a doubt.
I can't conceptually understand what to do and what to use in order to make a custom boot.
i'm working with QorIQ LS1043ARDB board.
I am writing to ask you for information on how to create a completely customized boot, using software tools made available by NXP.
I would like to generate a custom boot from SD.
By custom boot I mean that after the PBL, which loads me the RCW and the PBI commands, I would like to start my personal program that prints the simply word "Hello" by UART instead of starting U-Boot.
Meanwhile, I try to clarify the nomenclature:
- Is it right to call the phase of the pre-boot loader (PBL), which takes care of loading RCW in its appropriate register and executing the PBI commands with the word BOOTROM?
- While U-Boot is a very complex Bootloader, almost similar to an Operating System (OS)
In general I made a boot from SD using flex-builder.
But with flex-builder you create a classic sd boot, that is with a default PBL (in which, if desired, RCW can be modified and / or PBI commands can be entered)and the preset U-Boot bootloader.
I have not fully mastered flex-builder, but I know how to be able to modify RCW and / or enter PBI commands in the PBL.
- Can I generate only the part of the PBL with flex-builder?
- What is the best way to write a bootloader for the platform I'm working on?
- Can I merge the generated part of the PBL with the part of the bootloader customized by me later?
- is it possible to create an image file (.img) by combining the bootROM and the bootloader?
- Are there any software tools made available by NXP to be able to do such a thing?
- Is flex-builder capable of doing all this?
- If flex-builder manages to do it, is there a guide explaining it how to do it?
