MCUboot boot-up time

[aniruddhanalgirkar-eaton]

Hi, Recently we deployed the MCUboot in one of our device. In this, we selected the SWAP method, BOOT_VALIDATE_SLOT0 is selected as n. so, under this configuration, I called the API, k_uptime_get(); just before the application is getting called in the MCUboot main.c file. And thus, I measure the boot-up time as 31 ms. I want this to be lesser than this. (assume, 15 - 21 ms could be acceptable). So, how much minimum can it be ? How to optimize it further ? Thanks for any additional suggestions !

[nvlsianpu]

Can you turn off LOG and measure the timing using a gpio? I suspect that most of the time you had measured is just needed for log transmission,.

[d3zd3z]

Also, what kind of CPU does your device have? A Cortex-M0 will be a lot slower than a larger device would be.

Unless you have a particularly unusual flash device, I would recommend SWAP_MOVE instead of SWAP_SCRATCH. There is no swap partition needed, but the slot 0 should be 1 sector larger than slot 1.

[aniruddhanalgirkar-eaton]

the SWAP_MOVE option greatly reduced the boot-up time. Next, I am going to try with "config BOOT_TIME_MEASUREMENT" to measure it better way. Thanks !

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