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

[Hui Wang]

This is the log of armhf kernel + armhf uboot:

MMC:   emmc2 at 7e340000: 0, mmcnr at 7e300000: 1
Loading Environment from FAT... *** Warning - bad CRC, using default environment

In:    serial
Out:   serial
Err:   serial
Net:   Net Initialization Skipped
No ethernet found.
Unknown command 'usb' - try 'help'
Hit any key to stop autoboot:  0 
switch to partitions #0, OK
mmc0 is current device
Scanning mmc 0:1...
Found U-Boot script /boot.scr
777 bytes read in 47 ms (15.6 KiB/s)
## Executing script at 02400000
7315968 bytes read in 1424 ms (4.9 MiB/s)
20730891 bytes read in 3932 ms (5 MiB/s)
Kernel image @ 0x1000000 [ 0x000000 - 0x6fa200 ]
## Flattened Device Tree blob at 03000000
   Booting using the fdt blob at 0x3000000
   Using Device Tree in place at 03000000, end 0300d350

Starting kernel ...

[    0.000000] Booting Linux on physical CPU 0x0
[    0.000000] Linux version 5.3.0-1004-raspi2 (root at hwang4-Vostro-5390) (gcc version 7.4.0 (Ubuntu/Linaro 7.4.0-1ubuntu1~18.04.1)) #5 SMP Wed Sep 18 23:44:29 CST 2019 (Ubuntu 5.3.0-1004.5-raspi2 5.3.0)
[    0.000000] CPU: ARMv7 Processor [410fd083] revision 3 (ARMv7), cr=30c5383d
[    0.000000] CPU: div instructions available: patching division code
[    0.000000] CPU: PIPT / VIPT nonaliasing data cache, PIPT instruction cache
[    0.000000] OF: fdt: Machine model: Raspberry Pi 4 Model B Rev 1.1
[    0.000000] Memory policy: Data cache writealloc

....


ubuntu at ubuntu:~$ uname -a
Linux ubuntu 5.3.0-1004-raspi2 #5 SMP Wed Sep 18 23:44:29 CST 2019 armv7l armv7l armv7l GNU/Linux
ubuntu at ubuntu:~$ free
              total        used        free      shared  buff/cache   available
Mem:        3916244      145836     3600732       21912      169676     3704604
Swap:             0           0           0
ubuntu at ubuntu:~$ sudo ifconfig wlan0 up
ubuntu at ubuntu:~$ sudo iwlist wlan0 scanning
wlan0     Scan completed :
          Cell 01 - Address: 58:C8:76:6B:C3:11
                    Channel:36
                    Frequency:5.18 GHz (Channel 36)
                    Quality=34/70  Signal level=-76 dBm  
                    Encryption key:on
                    ESSID:"CMCC-T69d-5G"
                    Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s
                              36 Mb/s; 48 Mb/s; 54 Mb/s
                    Mode:Master
                    Extra:tsf=0000000000000000
                    Extra: Last beacon: 4ms ago
                    IE: Unknown: 000C434D43432D543639642D3547
                    IE: Unknown: 01088C129824B048606C
                    IE: Unknown: 030124
                    IE: Unknown: 05040001000C
                    IE: WPA Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (2) : TKIP CCMP
                        Authentication Suites (1) : PSK
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (2) : TKIP CCMP
                        Authentication Suites (1) : PSK
                    IE: Unknown: DD270050F204104A000110104400010210470010BC329E001DD811B2860158C8766BC311103C000102
                    IE: Unknown: 2D1AEF0117FFFF0000010000000000000000000000000C0000000000
                    IE: Unknown: 3D1624050400000000000000000000000000000000000000
                    IE: Unknown: BF0C3000C031FAFF0C03FAFF0C03
                    IE: Unknown: C005012A00FAFF
                    IE: Unknown: 7F080000000000000040
                    IE: Unknown: DD180050F2020101000003A4000027A4000042435E0062322F00
                    IE: Unknown: 200100
                    IE: Unknown: C304020F0F00
                    IE: Unknown: DD07000C4304000000
                    IE: Unknown: DD07000CE700000000
          Cell 02 - Address: 68:D1:BA:17:A2:E1
                    Channel:44
                    Frequency:5.22 GHz (Channel 44)
                    Quality=27/70  Signal level=-83 dBm  
                    Encryption key:on
                    ESSID:"CMCC-2wzy-5G"
                    Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s
                              36 Mb/s; 48 Mb/s; 54 Mb/s
                    Mode:Master
                    Extra:tsf=0000000000000000
                    Extra: Last beacon: 4ms ago
                    IE: Unknown: 000C434D43432D32777A792D3547
                    IE: Unknown: 01088C129824B048606C
                    IE: Unknown: 03012C
                    IE: Unknown: 0706555320240D14
                    IE: Unknown: 050400010002
                    IE: WPA Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (2) : TKIP CCMP
                        Authentication Suites (1) : PSK
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : TKIP
...

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to u-boot in Ubuntu.
https://bugs.launchpad.net/bugs/1847500

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

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/u-boot/+bug/1847500/+subscriptions