ubuntu@healy:~$ cat /proc/version
Linux version 4.8.0-25-generic (buildd@bos01-arm64-050) (gcc version 6.2.0 
20161005 (Ubuntu 6.2.0-5ubuntu12) ) #27-Ubuntu SMP Thu Oct 13 03:34:31 UTC 2016
ubuntu@healy:~$ cat /proc/cmdline 
root=UUID=ac43979f-3079-4c54-b98c-312b01337bfa ro acpi=force
ubuntu@healy:~$ dmesg | grep SPCR
[    0.000000] ACPI: SPCR 0x0000001FFEAF8510 000050 (v02 A M I  APTIO V  
01072009 AMI. 0005000B)
[    0.000000] ACPI: SPCR: console: pl011,mmio,0x87e024000000,115200

** Tags removed: verification-needed-yakkety
** Tags added: verification-done-yakkety

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  arm64: SPCR console not autodetected

Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Yakkety:
  Fix Committed

Bug description:
  ARM servers that boot in ACPI mode will not autodetect their console 
settings. The SBSA (Server Base System Architecture) spec requires that these 
settings be specified using the ACPI SPCR table. Support for parsing this table 
just landed upstream in the 4.9 merge window.

  [Test Case]
  Boot an ARM system in ACPI mode(I used a Cavium ThunderX CRB1S w/ 
acpi=force). You'll have no console unless you know and explicitly specify the 
correct console= parameter on the cmdline.

  [Regression Risk]
  The changes cleanly cherry-pick from upstream, so we'll have upstream support 
for any regressions. Though the patches do touch code in arch-indep 
directories, that code is limited by config options that restrict the 
functionality to either ARM or OpenFirmware systems:

  of/serial: move earlycon early_param handling to serial
   - Cleanup of OF-specific code.

  ACPI: parse SPCR and enable matching console
   - Adds parse_spcr() for all archs, but this function is only called from
     arch/arm64 code (next patch).
   - Adds an arch-generic call to a stub function only if the OF-specific
     earlycon parameter is specified. Further, that stub function just returns
     -ENODEV on non-OF systems.

   - ARM64-specific code, only built if CONFIG_ACPI=y

  serial: pl011: add console matching function
   - Driver for ARM AMBA-type serial port - code is only activated if a
     console=pl011,* parameter is specified on the cmdline.

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