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

[Launchpad Bug Tracker]

This bug was fixed in the package u-boot - 2019.07+dfsg-1ubuntu3

---------------
u-boot (2019.07+dfsg-1ubuntu3) eoan; urgency=medium

  * Avoid device-tree memory fixup on Raspberry Pi 4; this allows access to
    the all the RAM on models with more than 1Gb (LP: #1847500)

 -- Dave Jones <dave.jones at canonical.com>  Sat, 12 Oct 2019 01:02:29
+0100

** Changed in: u-boot (Ubuntu Eoan)
       Status: Triaged => Fix Released

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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:
  Fix Released
Status in u-boot source package in Eoan:
  Fix Released

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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