[Bug 1965260] Re: SRU: Detect RAM size automatically

[Lukas Märdian]

I've sponsored the fix for LP: #1979315 into Kinetic.

And re-uploaded the Jammy SRU as nezha-
boot0_20220228+g0ad88bf-0ubuntu2~22.04.1, including the fix from LP:
#1979315, dropping the previous version.

IMO we can recycle this bug report to do the SRU verification again,
once re-accepted by the SRU team. No need to do two SRU verifications
(on this bug and 1979315) just for a typo.

** Changed in: nezha-boot0 (Ubuntu Jammy)
       Status: Fix Committed => In Progress

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https://bugs.launchpad.net/bugs/1965260

Title:
  SRU: Detect RAM size automatically

Status in nezha-boot0 package in Ubuntu:
  Fix Released
Status in nezha-boot0 source package in Jammy:
  In Progress

Bug description:
  https://github.com/smaeul/sun20i_d1_spl/commits/d1-2022-01-22, commit
  525883d3721f4c4d78b498e780b44e85d0676abf contains patches to detect
  the RAM size automatically.

  [Impact]

  If the memory is not discovered automatically, the Nezha can't boot
  without an additional memory node in the device tree: the issue is
  that the Nezha boards comes now with 2 different amounts of memory,
  1GB or 2GB. So the additional device tree node can't cover both
  boards.

  It is essential to backport this fix to Jammy as we intend to provide
  first support for the Nezha board in 22.04.1.

  [Test Plan]

  To test the fix is correct, one can simply use this nezha-boot0 and
  check that the next stage bootloader (u-boot-nezha) advertises the
  right amount of memory for the board, which is displayed at boot right
  after the banner:

  U-Boot 2022.04 (Apr 21 2022 - 09:19:39 +0000)

  DRAM:  1 GiB
  sunxi_set_gate: (CLK#24) unhandled

  Additionally to that, do general dogfooding to see if the new version
  still works as expected.

  [Where problems could occur]

  The update will not introduce regressions as this package is *not*
  used since we did not deliver images for the Nezha board yet, support
  for this board is an additional feature scheduled for 22.04.1.

  [Other Info]

  Note that this only fixes the memory detection from boot0 to u-boot,
  another similar patch is needed for u-boot-nezha to patch the kernel
  device tree.

  Note #2: the SRU backports more than just the fix, see comment #10.

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