[saucy] [armhf] use pstore to save console log messages

[Paolo Pisati]

SRU Justification:

Impact: on platforms when there's a persistent memory storage (or when ram is not cleared during bootup like on arm), pstore and it's pstore-ram backend can be used to to save log messages on a previously defined and unallocated memory portion. Unfortunately, if we want to save bootup messages, we need the pstore-ram backend to be build in.

Fix: apply the attached patch and recompile.

Test: e.g., for a 256MB board, bootup a kernel with the following parameters:

"mem=128M ramoops.mem_address=0x8000000 ramoops.mem_size=1048576"

mem will tell the kernel to use only the first 128MB of ram, while ramoops address and size will the pstore where to find its storage and how big it is.
Later on you can retrieve those messages from the u-boot command line dumping that memory region (mdw 0x8000000...) or you can bootup another kernel, mount pstore and retrieve the logs stored there:

mount -t pstore - /sys/fs/pstore
cp /sys/fs/pstore/dmesg* .

--

[Brad Figg (brad-figg)]

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1248492

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 3.12.0-3.8

---------------
linux (3.12.0-3.8) trusty; urgency=low

  [ Andy Whitcroft ]

  * [Config] armhf: PSTORE_RAM=y and PSTORE_CONSOLE=y
    - LP: #1248492

  [ Grygorii Strashko ]

  * SAUCE: ARM: OMAP4460: cpuidle: Extend
    PM_OMAP4_ROM_SMP_BOOT_ERRATUM_GICD on cpuidle

  [ John Johansen ]

  * SAUCE: (no-up) apparmor: Fix tasks not subject to, reloaded policy
    - LP: #1236455

  [ Paolo Pisati ]

  * [Config] disable ARM_HIGHBANK_CPUIDLE

  [ Tim Gardner ]

  * [Config] CONFIG_DEBUG_BUGVERBOSE=y
    - LP: #1252353
  * Release tracker
    - LP: #1252455
 -- Tim Gardner <email address hidden> Tue, 12 Nov 2013 07:28:53 -0700

[Brad Figg (brad-figg)]

This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-saucy' to 'verification-done-saucy'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 3.11.0-15.23

---------------
linux (3.11.0-15.23) saucy; urgency=low

  [Brad Figg]

  * Release Tracking Bug
    - LP: #1259259

  [ Tim Gardner ]

  * [Config] Build-in ohci-pci
    - LP: #1244176

linux (3.11.0-15.22) saucy; urgency=low

  [Brad Figg]

  * Release Tracking Bug
    - LP: #1257092

  [ Andy Whitcroft ]

  * [Config] CONFIG_DEBUG_BUGVERBOSE=y
    - LP: #1252353

  [ Benjamin Tissoires ]

  * SAUCE: (no-up) HID: appleir: force input to be set
    - LP: #1244505

  [ John Johansen ]

  * SAUCE: (no-up) apparmor: Fix tasks not subject to, reloaded policy
    - LP: #1236455

  [ Kamal Mostafa ]

  * SAUCE: (no-up) drm/i915: i915.disable_pch_pwm overrides PCH_PWM_ENABLE
    quirk
    - LP: #1163720

  [ Manoj Iyer ]

  * SAUCE: Enable earlyprintk via the PL011.
    - LP: #1248233

  [ Paolo Pisati ]

  * [Config] armhf: RTC_DRV_PL031=y
    - LP: #1252242
  * [Config] armhf: CPU_FREQ=y && ARM_HIGHBANK_CPUFREQ=y
    - LP: #1249397

  [ Rob Herring ]

  * [Config] armhf: PSTORE_RAM=y and PSTORE_CONSOLE=y
    - LP: #1248492
  * SAUCE: net: calxedaxgmac: add mac address learning
    - LP: #1248233

  [ Tim Gardner ]

  * [Debian] Re-sign modules after debug objcopy
    - LP: #1253155

  [ Upstream Kernel Changes ]

  * Revert "rt2x00pci: Use PCI MSIs whenever possible"
    - LP: #1257037
  * Revert "epoll: use freezable blocking call"
    - LP: #1257037
  * Revert "select: use freezable blocking call"
    - LP: #1257037
  * Revert "ima: policy for RAMFS"
    - LP: #1257037
  * ARM: tlb: don't perform inner-shareable invalidation for local TLB ops
    - LP: #1239800
  * ARM: 7855/1: Add check for Cortex-A15 errata 798181 ECO
    - LP: #1239800
  * mfd: rtsx: Modify rts5249_optimize_phy
    - LP: #1255297
  * usb: musb: start musb on the udc side, too
    - LP: #1257037
  * usb-storage: add quirk for mandatory READ_CAPACITY_16
    - LP: #1257037
  * USB: support new huawei devices in option.c
    - LP: #1257037
  * USB: quirks.c: add one device that cannot deal with suspension
    - LP: #1257037
  * USB: quirks: add touchscreen that is dazzeled by remote wakeup
    - LP: #1257037
  * USB: serial: ftdi_sio: add id for Z3X Box device
    - LP: #1257037
  * xhci: Don't enable/disable RWE on bus suspend/resume.
    - LP: #1257037
  * cifs: Fix inability to write files >2GB to SMB2/3 shares
    - LP: #1257037
  * x86: Update UV3 hub revision ID
    - LP: #1257037
  * cpufreq: s3c64xx: Rename index to driver_data
    - LP: #1257037
  * cpufreq / intel_pstate: Fix max_perf_pct on resume
    - LP: #1257037
  * bcache: Fixed incorrect order of arguments to bio_alloc_bioset()
    - LP: #1257037
  * HID: wiimote: add LEGO-wiimote VID
    - LP: #1257037
  * cgroup: fix to break the while loop in cgroup_attach_task() correctly
    - LP: #1257037
  * mac80211: correctly close cancelled scans
    - LP: #1257037
  * mac80211: drop spoofed packets in ad-hoc mode
    - LP: #1257037
  * mac80211: use sta_info_get_bss() for nl80211 tx and client probing
    - LP: #1257037
  * mac80211: update sta->last_rx on acked tx frames
    - LP: #1257037
  * mac80211: fix crash if bitrate calculation goes wrong
    - LP: #1257...