Re: [SPAM] Linux 2.6.12 cannot run on 24K. Please give me some clues.

[Markus Gothe <markus.gothe@xxxxxx>]

Seems to me that running in EXkLusive/supervisor mode is the culprit.  
Try changing that before you get to userspace...

On 24 Jul, 2007, at 09:09 , colin wrote:

> Hi all,
> Could you help me on porting MIPS Linux?
>
> Our first embedded system using 4Kec is running very well on Linux  
> 2.6.12.
> Now the second chip using 24K has problems. I found that mtf0 and  
> mtc0 have
> hazard problem and I have solved it.
> static inline void unmask_mips_irq(unsigned int irq)
> {
>         set_c0_status(0x100 << (irq - mips_cpu_irq_base));
>         irq_enable_hazard();
> }
>
> Now Linux can continue running and then it will encounter problems  
> when
> running the first application, init. I will appreciate your clues for
> helping me on this probem. :D
>
> Colin
>
> ÿttyS0 at MMIO 0x0 (irq = 3) is a 16550A
> ttyS1 at MMIO 0x0 (irq = 3) is a 16550A
> io scheduler noop registered
> Freeing prom memory: 0kb freed
> Reclaim bootloader memory from 80010000 to 800f0000
> Freeing unused kernel memory: 252k freed
> CPU 0 Unable to handle kernel paging request at virtual address  
> ffffff88,
> epc == 00440f10, ra == 004000e4
> Oops in arch/mips/mm/fault.c::do_page_fault, line 167[#1]:
> Cpu 0
> $ 0   : 00000000 10000990 00400090 00000000
> $ 4   : 7fdd5ed0 7fdd5f94 00000000 7fdd5f94
> $ 8   : 00000000 00000000 80001cb2 00000b3b
> $12   : 7f1c0300 0001ffff 0001ffff 00000115
> $16   : 801f5e04 00000000 00000000 00000000
> $20   : 00000000 00000000 00000000 00000000
> $24   : 00000000 00440f00
> $28   : 10008c70 7fdd5e18 7fdd5e38 004000e4
> Hi    : 00000000
> Lo    : 00000000
> epc   : 00440f10     Not tainted
> ra    : 004000e4 Status: 00006802    KERNEL EXL
> Cause : 0880400c
> BadVA : ffffff88
> PrId  : 00019378
> Process init (pid: 1, threadinfo=80848000, task=80854bd8)
> Stack : 00000000 00000000 10008c70 00000000 10008c70 7fdd5e38 10008c70
> 004276e4
>         00000000 00000000 00000000 00000000 10008c70 00000000 7fdd5f9c
> 00000000
>         00000000 00000000 00000000 00000000 00000000 00000000 00000003
> 00400034
>         00000004 00000020 00000005 00000002 00000006 00001000 00000007
> 000000

_______________________________________

Mr Markus Gothe
Software Engineer

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