@satmandu thanks for the information! I'd got as far as figuring out the
dram_init call was getting the available RAM info from the mailbox,
which only permitted a single bank to be reported, which was then
getting used in the fdt fixup called by the bootm. As it happens the fdt
/memory node was already correct so there was no need for that
particular fixup. Hence the hack applied for now is just to disable the
fdt fixup.

Bumping to 2019.10 would be ideal, but unfortunately it's now too late
in the cycle before release to re-test all the other platforms using
u-boot. Still, it's useful to know that I can scrub that hack when we
bump to 2019.10 (which we can probably do next cycle) - saves me digging
further into it!

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https://bugs.launchpad.net/bugs/1847500

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

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