Merging 64 bit changes to -HEAD

[Luiz Otavio O Souza]

On Jun 28, 2010, at 7:14 AM, Jayachandran C. wrote:

> On Sun, Jun 27, 2010 at 8:20 PM, Jayachandran C.
> <c.jayachandran at gmail.com> wrote:
>> On Sun, Jun 27, 2010 at 4:00 PM, Luiz Otavio O Souza <lists.br at gmail.com> wrote:
>>> On Jun 15, 2010, at 10:36 AM, Jayachandran C. wrote:
>>> 
>>> ( ... )
>>>> 
>>>> I've tested this on XLR, but there is a chance that this might break
>>>> other platforms. So please let me know your comments on both the
>>>> patches and the merge process.
>>>> 
>>>> The future patches (if everything goes well), will do the PTE_ flag to
>>>> PG_ flag renaming in Juli's tree, then the actual n32/n64 changes.
>>>> 
>>>> Thanks,
>>>> JC.
>>> 
>>> JC,
>>> 
>>> I can't boot the ar71xx kernel after r209243:
>>> 
>>> http://mips.pastebin.com/CBhe6hzR
>>> http://pastebin.com/nrRdm1UF
>>> 
>>> Everything works fine with the previous revision (r209048).
>>> 
>>> If you need anything else, just let me know.
>> 
>> Let me have a look at this, thanks for the report.
> 
> Can you enable 'TRAP_DEBUG' in sys/mips/mips/trap.c and see if you can
> get the trap information printed.  Adding a line
> #define TRAP_DEBUG
> after all the #includes in trap.c should do it.  This should print the
> pc, ra, and badvaddr which would help a lot in debugging.
> 
> In the meantime I will look at the code again and see if I can find
> anything obviously wrong.
> 
> Thanks,
> JC.

JC,

The TRAP_DEBUG option doesn't help, but during the tests i found a weird symptom...

After a cold reset the kernel always hang at same place (after the WITNESS notice), but if i boot from an old kernel and issue a 'reboot' the board boots just fine.

I've add a few printfs all around to find where it hangs and this happen at the first call of pmap_map() at vm_page_startup().

Here is a dmesg from a failed boot: http://mips.pastebin.com/QnUu56hD

And here is a successful one: http://mips.pastebin.com/bsJ4Ac3z

I hope this can give you some clue about what's is going on...

Thanks,
Luiz