immutable bootloader vs immutable+upgradable bootloader

RE: immutable bootloader vs immutable+upgradable bootloader

ziv123 — Tue, 08 Mar 2022 12:27:27 GMT

hi Amanda

i would appreciate if i can get another opinion, may be you can divert the issue to a co-worker

if it is not possible then you can close this thread

best regards

Ziv

RE: immutable bootloader vs immutable+upgradable bootloader

Amanda Hsieh — Tue, 08 Mar 2022 12:14:59 GMT

Hi,

Not sure what feature you need, but I mean it's provided by Zephyr. If you don't get any issues, then don't worry about that.

-Amanda

RE: immutable bootloader vs immutable+upgradable bootloader

ziv123 — Tue, 08 Mar 2022 10:23:34 GMT

hi Amanda

i am not that experienced, only few years as embedded engineer and i was actually hoping to get some examples as for what possible features i might want to add that are not possible to implement in the application itself, or better implemented in a second stage bootloader, that justify the extra space in memory that a second bootlodaer will take ?

( my system is currently built in zephyr using mcuboot as first stage bootloader )

hope to read from you soon

best regards

Ziv

RE: immutable bootloader vs immutable+upgradable bootloader

Amanda Hsieh — Tue, 08 Mar 2022 10:00:21 GMT

Hi,

[quote user="ziv123"]the question was when, or in what scenarios, or for what use cases will i want the ability to upgrade my bootloader [/quote]

Maybe one day you would like to update the bootloader with new features, modifications, and so on.

-Amanda

RE: immutable bootloader vs immutable+upgradable bootloader

ziv123 — Mon, 07 Mar 2022 13:40:15 GMT

hi Amanda

this much i understand

the question was when, or in what scenarios, or for what use cases will i want the ability to upgrade my bootloader

considering i work with nrf52840 with zephyr which currently has no space issue when booting the whole zephyr application (including zephyr's ble stack implemented and compiled in it)

hope to read from you soon

best regards

Ziv

RE: immutable bootloader vs immutable+upgradable bootloader

Amanda Hsieh — Mon, 07 Mar 2022 12:32:42 GMT

Hi,

If you want the bootloader to perform firmware updates for only upgrading an application, then use the single-stage, immutable bootloader solution.

If you want the bootloader to support firmware updates for both itself and the application, then use the two-stage, upgradable bootloader solution.

Regards,
Amanda