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[Fathi Boudra <fathi.boudra@xxxxxxxxxx>]

Set to fix-released for Linux Linaro, according to Andrey's comment #9

** Changed in: linux-linaro
       Status: Triaged => Fix Released

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https://bugs.launchpad.net/bugs/918412

Title:
  OMAP Panda does not boot on Linux-linaro 3.2 branch

Status in Linaro Texas Instruments Landing Team:
  New
Status in Linaro Linux:
  Fix Released

Bug description:
  Reported by Andy Green:

  Quite early in boot, it blows a new BUG() in the code around
  iotable_init(), I added some debug and see it's blowing up when trying
  to define io memory in omap_barriers_init().  A bunch of earlier
  machine-defined iotable_inits go OK.

  [    0.000000] iotable_init: adding addr=DA000000 size=02000000
  phys_addr=9A000000
  [    0.000000] iotable_init: adding addr=F8000000 size=00100000
  phys_addr=44000000
  [    0.000000] iotable_init: adding addr=FC000000 size=00400000
  phys_addr=4A000000
  [    0.000000] iotable_init: adding addr=F9000000 size=00100000
  phys_addr=50000000
  [    0.000000] iotable_init: adding addr=FD100000 size=00100000
  phys_addr=4C000000
  [    0.000000] iotable_init: adding addr=FD200000 size=00100000
  phys_addr=4D000000
  [    0.000000] iotable_init: adding addr=FD300000 size=00100000
  phys_addr=4E000000
  [    0.000000] iotable_init: adding addr=FA000000 size=00400000
  phys_addr=48000000
  [    0.000000] iotable_init: adding addr=FE800000 size=00800000
  phys_addr=54000000
  ...
  [    0.538024] omap_barriers_init: calling iotable_init
  [    0.543243] iotable_init: adding addr=FE600000 size=00100000
  phys_addr=AF600000
  [    0.550872] ------------[ cut here ]------------
  [    0.555725] Kernel BUG at c087c74c [verbose debug info unavailable]
  [    0.562255] Internal error: Oops - undefined instruction: 0 [#1] PREEMPT SMP
  [    0.569610] Modules linked in:
  [    0.572845] CPU: 1    Tainted: G        W
  (3.2.0-panda_tracking-topic-syslink-k3u+ #6)
  [    0.581451] PC is at vm_area_add_early+0x20/0x84
  [    0.586303] LR is at iotable_init+0xa8/0xbc
  [    0.590698] pc : [<c087c74c>]    lr : [<c086cd48>]    psr: 20000113
  [    0.590698] sp : ef78ff54  ip : ef78fe10  fp : 00000000
  [    0.602691] r10: c086cca0  r9 : 00000000  r8 : 40000001
  [    0.608154] r7 : ef7ffee0  r6 : ef78ff90  r5 : ef7ffec0  r4 : 00000001
  [    0.614959] r3 : 00000001  r2 : 00000000  r1 : 00000001  r0 : ef7ffec0
  [    0.621765] Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM
  Segment kernel
  [    0.629394] Control: 10c5387d  Table: 8000404a  DAC: 00000015
  [    0.635406] Process swapper/0 (pid: 1, stack limit = 0xef78e2f8)
  [    0.641662] Stack: (0xef78ff54 to 0xef790000)
  [    0.646240] ff40: 00000001 00000000 af600000
  [    0.654754] ff60: c09299e0 ef78e000 00000000 00000000 c0870f8c
  c0871070 c08d7f9c c08a7bf8
  [    0.663269] ff80: fe600000 000af600 00100000 0000000e c08a7bfc
  c0008870 0000009f c009f590
  [    0.671783] ffa0: 0000009f c0870f8c c0014640 00393531 00000000
  c0150000 00000000 c08e5604
  [    0.680297] ffc0: 0000019a c08a7bfc c08a842c c0014640 00000013
  00000000 00000000 00000000
  [    0.688812] ffe0: 00000000 c08668bc 00000000 00000000 c0866830
  c0014640 55555555 45515555
  [    0.697326] [<c087c74c>] (vm_area_add_early+0x20/0x84) from
  [<00000000>] (  (null))
  [    0.705322] Code: 059f3068 01a0c003 05933000 0a000010 (e7f001f2)
  [    0.711700] ---[ end trace 1b75b31a2719ed1d ]---
  [    0.716552] Kernel panic - not syncing: Attempted to kill init!
  [    0.722747] CPU0: stopping
  [    0.725646] [<c001a930>] (unwind_backtrace+0x0/0xf8) from
  [<c0018cf8>] (handle_IPI+0x114/0x140)
  [    0.734710] [<c0018cf8>] (handle_IPI+0x114/0x140) from [<c00086c0>]
  (gic_handle_irq+0x88/0xac)
  [    0.743682] [<c00086c0>] (gic_handle_irq+0x88/0xac) from
  [<c05fa0c0>] (__irq_svc+0x40/0x70)
  [    0.752380] Exception stack(0xc08adf70 to 0xc08adfb8)
  [    0.757659] df60:                                     ffffffed
  00000000 c08adfb8 00000000
  [    0.766174] df80: c08ac000 c0929aa8 c0603f50 c08c9bd8 c08c9d98
  412fc09a 00000000 00000000
  [    0.774688] dfa0: 00000000 c08adfb8 c00146bc c00146c0 60000013 ffffffff
  [    0.781616] [<c05fa0c0>] (__irq_svc+0x40/0x70) from [<c00146c0>]
  (default_idle+0x24/0x28)
  [    0.790130] [<c00146c0>] (default_idle+0x24/0x28) from [<c001493c>]
  (cpu_idle+0xfc/0x11c)
  [    0.798645] [<c001493c>] (cpu_idle+0xfc/0x11c) from [<c08667e0>]
  (start_kernel+0x260/0x2b0)
  [    0.807342] [<c08667e0>] (start_kernel+0x260/0x2b0) from
  [<80008044>] (0x80008044)

  You can see what's going on in omap_barriers_init() here:

  http://git.linaro.org/gitweb?p=landing-
  teams/working/ti/kernel.git;a=blob;f=arch/arm/mach-
  omap2/omap4-common.c;h=ad8c30d610736dde454bfe81f764f4a98b902dbf;hb=refs/heads/temp#l97

  From Andrey K.:

  
  I haven't dig deep into that, but the rmk's commit 716a3dc20084 description says that
  "Several platforms are now using the memblock_alloc+memblock_free+
  memblock_remove trick to obtain memory which won't be mapped in the
  kernel's page tables.  Most platforms do this (correctly) in the
  ->reserve callback.  However, OMAP has started to call these functions
  outside of this callback, and this is extremely unsafe - memory will
  not be unmapped, and could well be given out after memblock is no
  longer responsible for its management."

  Vanilla v3.2 kernel patched with "ARM: OMAP4: Fix errata i688 with MPU interconnect barriers" passes omap_barriers_init() ok (but crashes later in my setup). But "v3.2 merged with rmk's devel-stable" kernel encounters a BUG() inside the introduced omap_barriers_init()
  (the log is in the original message below). Looks like the "ARM: OMAP4: Fix errata i688 with MPU interconnect barriers" needs to be fixed anyway, but probably there is something in the rmk's devel-stable
  tree that makes this issue to the problem with calling the memblock_alloc+memblock_free+memblock_remove functions outside of ->reserve callback to reveal.

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