Secure Boot - boot time

[samuel4]

Hi

For a low power product, I need the nRF54L15 to wake up periodically with very low consumption in between. In the deepest sleep mode there is no RAM retained and so the bootloader will rerun on every wake up I guess. Therefor the critical question for me is, how fast can secure boot be.

I have tried the bootloader example, but it results in 400ms boot time after reset is released. Probably that's not the way to test it.

Do you know what boot times are achivable or can you give me some hints how I should test it?

Kind regards

Samuel

[AHaug]

Hi, 

You refer to both "secure boot" and "bootloader". Are any of these referring to NSIB or MCUboot? 

The 400ms you're seeing is higher than what I would expect from MCUboot validating the app image(s), but it might be due to writing over some sort of serial, for instance UART logging. Have you disabled this? If not, do you see the same speed if you've disabled all writes?

Kind regards,
Andreas