Comment 0 for bug 1811196

raspi3-firmware still includes old versions of the Raspberry Pi bootloader (*.elf, *.dat, bootcode.bin). Since these files are from December 2017, Pi models that use the second revision of the BCM2837 SoC (BCM2837B0) do not boot using raspi3-firmware since the bootloader included in this package is incompatible with the new SoC.

For the Pi 3B+ to boot, newer bootloader files are needed. disco already has a raspi3-firmware package based on the latest bootloader files, so it shouldn't be too hard to implement these into bionic.