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

[Hui Wang]

For WiFi, I remember I found the firmware from someplace, then the WiFi
worked.

ubuntu at ubuntu:~$ ls /lib/firmware/brcm/brcmfmac43455-sdio.* -la
-rw-r--r-- 1 root root 600487 Sep  1 05:45 /lib/firmware/brcm/brcmfmac43455-sdio.bin
-rw-r--r-- 1 root root  14036 Sep  1 05:45 /lib/firmware/brcm/brcmfmac43455-sdio.clm_blob
-rw-r--r-- 1 root root   2054 Sep  1 05:45 /lib/firmware/brcm/brcmfmac43455-sdio.raspberrypi,4-model-b.txt
-rw-r--r-- 1 root root   2054 Sep  1 05:45 /lib/firmware/brcm/brcmfmac43455-sdio.txt
ubuntu at ubuntu:~$ ls /lib/firmware/brcm/brcmfmac43455-sdio.* | xargs md5sum
963eb0d4903040974ee88b4f85cb1f4f  /lib/firmware/brcm/brcmfmac43455-sdio.bin
c5aeca0e33de4ae870986c517963fef7  /lib/firmware/brcm/brcmfmac43455-sdio.clm_blob
7b983812a8aee7bf701460436c686226  /lib/firmware/brcm/brcmfmac43455-sdio.raspberrypi,4-model-b.txt
7b983812a8aee7bf701460436c686226  /lib/firmware/brcm/brcmfmac43455-sdio.txt

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

Status in u-boot package in Ubuntu:
  Confirmed

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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