I compared it to release 9.0 and noticed it increased about 3 KiB of Flash usage, but I didn't check further to see what happened. NuttX 9.0 $ arm-none-eabi-size nuttx text data bss dec hex filename 68624 104 2496 71224 11638 nuttx NuttShell (NSH) NuttX-9.0.0 nsh> free total used free largest Umem: 192976 7536 185440 125248 nsh> NuttX 9.1 RC0 $ arm-none-eabi-size nuttx text data bss dec hex filename 71732 104 2476 74312 12248 nuttx NuttShell (NSH) NuttX-9.1.0 nsh> free total used free largest Umem: 192992 7536 185456 125264 nsh>
This might indicate a significant problem. One possible explanation might be that a new configuration option enables logic by default that it should not. Almost any explanation you can think of suggests a problem.