[Bug 1847500] Re: Full RAM on Pi4 isn't accessible when using u-boot

[Francis Ginther]

** Tags added: id-5da213af648ad25edff98c2d

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Title:
  Full RAM on Pi4 isn't accessible when using u-boot

Status in Release Notes for Ubuntu:
  New
Status in u-boot package in Ubuntu:
  Triaged
Status in u-boot source package in Eoan:
  Triaged

Bug description:
  Booting the latest eoan daily on a Pi4 with >1Gb of RAM, only the
  first 1Gb of RAM appears accessible:

      ubuntu at ubuntu:~$ free
                    total        used        free      shared  buff/cache   available
      Mem:         931920      185484      504748        3664      241688      723820
      Swap:             0           0           0

  However, adjusting the config.txt so that the kernel is booted
  directly without u-boot in between results in the full 4Gb being
  accessible:

      ubuntu at ubuntu:~$ free
                    total        used        free      shared  buff/cache   available
      Mem:        3884464      189852     3457504        3656      237108     3636004
      Swap:             0           0           0

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