Public bug reported:

I tried out the Ubuntu Server 18.04 ARM64 beta image on my Raspberry Pi
3 and when raspi3-firmware's script is run, the config.txt gets
overwritten to use the Pi's built-in bootloader to boot the kernel and
initramfs instead of u-boot.

There are multiple solutions to this:

*Stop using raspi3-firmware and start using u-boot.
*Stop using u-boot in the server image and start using raspi3-firmware and the 
Pi's built-in bootloader.
*Update raspi3-firmware so that if it detects a u-boot binary in 
/boot/firmware, it won't update the config.txt.
*Enable CONFIG_DMA_CMA=y in the generic ARM64 kernel and start using that with 
GRUB2 and u-boot instead.

** Affects: raspi3-firmware (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1812546

Title:
  raspi3-firmware overwrites u-boot in the beta server image

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