Dear Ying-Chun Liu, In message <20220125135535.224061-1-grandp...@gmail.com> you wrote: > > I've implemented A/B firmware update based on eMMC hw partitions. > Normally we have 2 boot partitions on eMMC. One is active and another > is inactive. We can then flash the firmware to the inactive one and > make it active.
We have been doing software updates using U-Boot scripts etc. for many, many years. But during that time a large number of restrictions and shortcomings became clear. this is why projects like SWUpdate [1] came into life, and U-Boot supports this only with very basic features: - watchdog support to reset a hanging system - boot counter to switch to an alternate boot command in case of too many failed boot attempts That's all. Not more is needed, and not more should be used in U-Boot. I'm not sure if you know SWUpdate - if not, you should definitely look into it. I strongly recommend not to try to reinvent that wheel - poorly - in U-Boot. We have been there before, and got rid of this approach for a pretty long list of good reasons. [1] https://sbabic.github.io/swupdate/ Best regards, Wolfgang Denk -- DENX Software Engineering GmbH, Managing Director: Wolfgang Denk HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: w...@denx.de "More software projects have gone awry for lack of calendar time than for all other causes combined." - Fred Brooks, Jr., _The Mythical Man Month_
