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    Subject[PATCH 3.13 151/198] ARM: mvebu: DT: fix OpenBlocks AX3-4 RAM size
    Date
    3.13.11.5 -stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Jason Cooper <jason@lakedaemon.net>

    commit e47043aea3853a74a9aa5726a1faa916d7462ab7 upstream.

    The OpenBlocks AX3-4 has a non-DT bootloader. It also comes with 1GB of
    soldered on RAM, and a DIMM slot for expansion.

    Unfortunately, atags_to_fdt() doesn't work in big-endian mode, so we see
    the following failure when attempting to boot a big-endian kernel:

    686 slab pages
    17 pages shared
    0 pages swap cached
    [ pid ] uid tgid total_vm rss nr_ptes swapents oom_score_adj name
    Kernel panic - not syncing: Out of memory and no killable processes...

    CPU: 1 PID: 351 Comm: kworker/u4:0 Not tainted 3.15.0-rc8-next-20140603 #1
    [<c0215a54>] (unwind_backtrace) from [<c021160c>] (show_stack+0x10/0x14)
    [<c021160c>] (show_stack) from [<c0802500>] (dump_stack+0x78/0x94)
    [<c0802500>] (dump_stack) from [<c0800068>] (panic+0x90/0x21c)
    [<c0800068>] (panic) from [<c02b5704>] (out_of_memory+0x320/0x340)
    [<c02b5704>] (out_of_memory) from [<c02b93a0>] (__alloc_pages_nodemask+0x874/0x930)
    [<c02b93a0>] (__alloc_pages_nodemask) from [<c02d446c>] (handle_mm_fault+0x744/0x96c)
    [<c02d446c>] (handle_mm_fault) from [<c02cf250>] (__get_user_pages+0xd0/0x4c0)
    [<c02cf250>] (__get_user_pages) from [<c02f3598>] (get_arg_page+0x54/0xbc)
    [<c02f3598>] (get_arg_page) from [<c02f3878>] (copy_strings+0x278/0x29c)
    [<c02f3878>] (copy_strings) from [<c02f38bc>] (copy_strings_kernel+0x20/0x28)
    [<c02f38bc>] (copy_strings_kernel) from [<c02f4f1c>] (do_execve+0x3a8/0x4c8)
    [<c02f4f1c>] (do_execve) from [<c025ac10>] (____call_usermodehelper+0x15c/0x194)
    [<c025ac10>] (____call_usermodehelper) from [<c020e9b8>] (ret_from_fork+0x14/0x3c)
    CPU0: stopping
    CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.15.0-rc8-next-20140603 #1
    [<c0215a54>] (unwind_backtrace) from [<c021160c>] (show_stack+0x10/0x14)
    [<c021160c>] (show_stack) from [<c0802500>] (dump_stack+0x78/0x94)
    [<c0802500>] (dump_stack) from [<c021429c>] (handle_IPI+0x138/0x174)
    [<c021429c>] (handle_IPI) from [<c02087f0>] (armada_370_xp_handle_irq+0xb0/0xcc)
    [<c02087f0>] (armada_370_xp_handle_irq) from [<c0212100>] (__irq_svc+0x40/0x50)
    Exception stack(0xc0b6bf68 to 0xc0b6bfb0)
    bf60: e9fad598 00000000 00f509a3 00000000 c0b6a000 c0b724c4
    bf80: c0b72458 c0b6a000 00000000 00000000 c0b66da0 c0b6a000 00000000 c0b6bfb0
    bfa0: c027bb94 c027bb24 60000313 ffffffff
    [<c0212100>] (__irq_svc) from [<c027bb24>] (cpu_startup_entry+0x54/0x214)
    [<c027bb24>] (cpu_startup_entry) from [<c0ac5b30>] (start_kernel+0x318/0x37c)
    [<c0ac5b30>] (start_kernel) from [<00208078>] (0x208078)
    ---[ end Kernel panic - not syncing: Out of memory and no killable processes...

    A similar failure will also occur if ARM_ATAG_DTB_COMPAT isn't selected.

    Fix this by setting a sane default (1 GB) in the dts file.

    Signed-off-by: Jason Cooper <jason@lakedaemon.net>
    Tested-by: Kevin Hilman <khilman@linaro.org>
    Signed-off-by: Arnd Bergmann <arnd@arndb.de>
    Signed-off-by: Kamal Mostafa <kamal@canonical.com>
    ---
    arch/arm/boot/dts/armada-xp-openblocks-ax3-4.dts | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/arch/arm/boot/dts/armada-xp-openblocks-ax3-4.dts b/arch/arm/boot/dts/armada-xp-openblocks-ax3-4.dts
    index d6cce8a..d11b1b5 100644
    --- a/arch/arm/boot/dts/armada-xp-openblocks-ax3-4.dts
    +++ b/arch/arm/boot/dts/armada-xp-openblocks-ax3-4.dts
    @@ -23,7 +23,7 @@

    memory {
    device_type = "memory";
    - reg = <0 0x00000000 0 0xC0000000>; /* 3 GB */
    + reg = <0 0x00000000 0 0x40000000>; /* 1 GB soldered on */
    };

    soc {
    --
    1.9.1


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