ubuntu@starbuck:~$ dmesg --level=err
[    2.593406] Error parsing PCC subspaces from PCCT
[    2.628707] pci 0000:1f:00.0: BAR 0: failed to claim resource for efifb!
[   13.457667] Couldn't get size: 0x800000000000000e
[   13.462362] MODSIGN: Couldn't get UEFI db list
[   13.466810] Couldn't get size: 0x800000000000000e
[   13.476127] Couldn't get size: 0x800000000000000e
ubuntu@starbuck:~$ cat /proc/version
Linux version 4.13.0-17-generic (buildd@bos01-arm64-036) (gcc version 7.2.0 
(Ubuntu/Linaro 7.2.0-8ubuntu3)) #20-Ubuntu SMP Mon Nov 6 10:04:20 UTC 2017

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

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https://bugs.launchpad.net/bugs/1724117

Title:
  thunderx2 ahci errata workaround needs additional delays

Status in linux package in Ubuntu:
  Won't Fix
Status in linux source package in Artful:
  Fix Committed

Bug description:
  [Impact]
  Early ThunderX silicon may hang when initializing the SATA controller.

  [Test Case]
  This was found in a reboot loop.

  The latest ThunderX2 firmware (3.1) enables hardware error interrupts and
  when the reset fix fails, we get a hang with the print:
  [   14.839308] sd 1:0:0:0: [sdb] 468862128 512-byte logical blocks: (240 
GB/224 GiB)
  [   14.846796] sd 1:0:0:0: [sdb] 4096-byte physical blocks
  [   14.852036] sd 1:0:0:0: [sdb] Write Protect is off
  [   14.856843] sd 1:0:0:0: [sdb] Write cache: enabled, read cache: enabled, 
doesn't support DPO or FUA
  [   14.866022] ata2.00: Enabling discard_zeroes_data

          *** NBU BAR Error 0x1e25c ***
           AddrLo 0x1d80180 AddrHi 0x0

  [Regression Risk]
  The fix is only compiled in on arm64, and only activated at runtime on this 
specific revision of silicon, so regression risk will be limited to a single 
platform that is only being distributed for development purposes.

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