[GitHub] [mynewt-newtmgr] FARLY7 commented on issue #185: Flash alignment mismatch leads to large overhead with Zephyr mcumgr

[GitBox <gi...@apache.org>]

FARLY7 commented on issue #185:
URL: https://github.com/apache/mynewt-newtmgr/issues/185#issuecomment-1235156723

   Adding to my initial comment, adding the patch provided by @LockeKK causes `image upload` to hang when using SMP Server with USB CDC ACM.
   
   I haven't been able to figure out why, but I figured it must be something to do with MTU sizes, however, I have tried every MTU-like KConfig option I can find and cannot get it to work.
   
   There are serious reliability issues with this mcumgr solution that need to be addressed. For a feature that is so fundamental to Zephyr, it's saddening that it works so poorly.
   
   Without the patch, it should not take 1min and 47s to upload a 340kB image over USB. Adding in the 45s it takes for MCUBoot to perform the image swap on reset. We're talking a few minutes to update a small image. The ESP32 serial bootloader can update a much larger image, in a fraction of this time. 


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