Comment 8 for bug 1940400

@sil2100 -- sorry, forgot SRU procedures were necessary in this case! I've amended the description as requested.

You are correct that the "Breaks: flash-kernel" omission in d/control is indeed deliberate: in flash-kernel 3.100 onwards (which isn't present in Bionic, and which I don't fancy *also* back-porting simultaneously as the changes are more invasive) handles the transfer of the boot firmware (and everything else, u-boot, kernel, initrd, etc.) to the boot partition. Prior to this, the task was fragmented across packages (but only on the pi, and not on any other platforms flash-kernel dealt with):

* pi boot firmware was copied by this package's postinst (hence why this is re-instated in the proposed package)
* u-boot binaries were copied by that package's postinst
* kernel and initrd were copied by flash-kernel