LPC Microcontrollers中的主题 Re: DualBoot on LPC55s28

DualBoot on LPC55s28

EmilL — Mon, 11 Sep 2023 17:45:42 GMT

I have been building secondary bootloader for lpc55s28 to be able to receive updates. I have been following AN12327 to build my own secondary bootloader. My question is how do I make one bin file that can be booted from either slot? I guess what I mean is position independent code. Or is this unrealistic goal and I should just deliver two update images with SP and PC for both image addresses?

Re: DualBoot on LPC55s28

Alice_Yang — Wed, 13 Sep 2023 07:37:22 GMT

Hello @EmilL

The bootloader boot image refer to Version in image header:

You can refer to boot flow:

Alice

Re: DualBoot on LPC55s28

frank_m — Wed, 13 Sep 2023 10:51:15 GMT

> My question is how do I make one bin file that can be booted from either slot? I guess what I mean is position independent code. Or is this unrealistic goal and I should just deliver two update images with SP and PC for both image addresses?

I never tried that, and neither heard of any commercial implementation.
I would avoid such an endeavor on an MCU without MMU, I'm not even sure if the toolchains support it all the way through.

You could use a fallback image instead, in case the new version (or the Flash update) fails. Or more than one image versions, all linked to the same start address.

Re: DualBoot on LPC55s28

micy-M — Thu, 10 Apr 2025 08:50:05 GMT

HI EMILY,

I am new for LPC, just wondering how to develop the LPC55S28 secondary bootlaoder.Following AN12327,i can t find any sample of SBL in LPC55S28 SDK packge.AND i am trying to make the LPC55s69 sbl sample works in LPC55S28,is it the way how you make it?
thanks for advantage.

BR
Micy