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Date:   Thu, 18 Aug 2011 18:05:38 -0700
From:   David Daney <david.daney@cavium.com>
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To:     Jason Kwon <jason.kwon@ericsson.com>
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Subject: Re: Problems booting 3.0.3 kernel on Octeon CN58XX board
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On 08/18/2011 05:10 PM, Jason Kwon wrote:
> Attempting to boot a 3.0.3 kernel on a CN58XX board produced the
> following oops:
>
> CPU 4 Unable to handle kernel paging request at virtual address
> 0000000001c00000, epc == ffffffff811aa9f4, ra == ffffffff811aaa98
> Oops[#1]:
> Cpu 4
> $ 0 : 0000000000000000 0000000010008ce0 ffffffff821d2b80 0000000001c00000
> $ 4 : 0000000001c00038 000000000000017c 0000000000080000 0000000000080072
> $ 8 : 0000000000000008 0000000000000002 0000000000000003 a800000002284520
> $12 : 0000000000000002 ffffffff8186ee80 ffffffffffffff80 0000000000000030
> $16 : 0000000000080072 0000000000000001 0000000001bfa8f0 0000000001bfa928
> $20 : a800000003aff8f0 00000000000f0000 ffffffff8186ee80 ffffffff821d2a80
> $24 : 0000000000000001 0000000000000038
> $28 : a80000041fc48000 a80000041fc4bd90 fffffffffffffffc ffffffff811aaa98
> Hi : 0000000000000000
> Lo : 0000000000000000
> epc : ffffffff811aa9f4 setup_per_zone_wmarks+0x19c/0x2d8
> Not tainted
> ra : ffffffff811aaa98 setup_per_zone_wmarks+0x240/0x2d8
> Status: 10008ce2 KX SX UX KERNEL EXL
> Cause : 40808408
> BadVA : 0000000001c00000
> PrId : 000d0301 (Cavium Octeon+)
> Modules linked in:
> Process swapper (pid: 1, threadinfo=a80000041fc48000,
> task=a80000041fc44038, tls=0000000000000000)
> Stack : 0000000000000000 000000000006f75d ffffffff8186eec0 0000000000000001
> 0000000000000547 ffffffff81825598 ffffffff81a80000 ffffffff818b3e68
> ffffffff818a40ac 0000000000000000 ffffffff81a80000 0000000000000000
> 0000000000000000 0000000000000000 0000000000000000 ffffffff818a40f0
> ffffffff81a80000 ffffffff81100438 ffffffff818b4198 ffffffff818b3e68
> ffffffff818b46c8 0000000000000000 0000000000000000 ffffffff818721d0
> 0000000000000000 0000000000000000 0000000000000000 ffffffff81109bb0
> 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> 0000000000000000 0000000000000000 0000000000000000 ffffffff818720f8
> 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> ...
> Call Trace:
> [<ffffffff811aa9f4>] setup_per_zone_wmarks+0x19c/0x2d8
> [<ffffffff818a40f0>] init_per_zone_wmark_min+0x44/0xe0
> [<ffffffff81100438>] do_one_initcall+0x38/0x160
> [<ffffffff818721d0>] kernel_init+0xd8/0x178
> [<ffffffff81109bb0>] kernel_thread_helper+0x10/0x18
[...]

Weird, I get the same thing on cn5860 and cn3860.

cn5750 and cn5020 are fine.

Normally I test on my ebh5610 board (cn5750) so I didn't notice this.

It may be caused by holes in the memory map.  Earlier I posted patches 
to set the memory as present:

http://patchwork.linux-mips.org/patch/1988/
http://patchwork.linux-mips.org/patch/1989/
http://patchwork.linux-mips.org/patch/1990/

One or more of those might help, but it is just a guess at this point.

I might take a look next week.

David Daney