The changes in ubuntu9.1 did make it into impish in ubuntu10.
https://launchpadlibrarian.net/538731561/u-boot_2021.01+dfsg-3ubuntu9_2021.01+dfsg-3ubuntu10.diff.gz
However, it looks like they were later removed from impish.
https://launchpadlibrarian.net/539465636/u-boot_2021.01+dfsg-3ubuntu10_2021.01+dfsg-4ubuntu1.diff.gz
The changes in ubuntu9.1 did make it into impish in ubuntu10.
https:/ /launchpadlibra rian.net/ 538731561/ u-boot_ 2021.01+ dfsg-3ubuntu9_ 2021.01+ dfsg-3ubuntu10. diff.gz
However, it looks like they were later removed from impish.
https:/ /launchpadlibra rian.net/ 539465636/ u-boot_ 2021.01+ dfsg-3ubuntu10_ 2021.01+ dfsg-4ubuntu1. diff.gz