Re: earmhf issues on Beaglebone Black

[Matt Thomas <matt%3am-software.com@localhost>]

On Jul 22, 2014, at 2:21 PM, Manuel Bouyer <bouyer%antioche.eu.org@localhost> 
wrote:

> On Tue, Jul 22, 2014 at 02:07:49PM -0700, Matt Thomas wrote:
>>>>> dab_buserr far 0x7fffcb80 -> NULL
>>>>> copyargs, 1620: copyout @0x7fffcb80 4
>>>>> copyoutargs: copyargs failed 14
>> 
>> That fsr is weird.  The domain is right but the reason is very
>> strange: Synchronous external abort on translation table walk (2nd level)
> 
> It seems that the reason is always this one.
> 
>> 
>>>>> data_abort_handler: data_aborts fsr=0x18be far=0x40062000
>>>>> dab_buserr far 0x40062000 -> NULL
>>>>> copyin_vmspace: copyin 0x40062000 0xc923c000 372 return 14
>> 
>> Again the fsr is strange because the domain should be 1, not 0xb.
>> 
>>>>> Does the patch below to print the PA makes sense ?
>>>>> If so, could it be that the CPU, on some conditions, returns the
>>>>> wrong fault type ?
>> 
>> I wonder what the l1pt has for the entry that corresponds to the address.
>> Can out also print pm->pm_l1[far >> L1_S_SHIFT]?
>> Is it getting corrupted somehow?
> 
> it's easy, here's a few outputs:
> data_abort_handler: data_aborts fsr=0x180e far=0x7fffcb70
> dab_buserr far 0x7fffcb70 -> NULL pm->pm_l1[far >> L1_S_SHIFT] = 0x0
> copyargs, 1620: copyout @0x7fffcb70 4
> copyoutargs: copyargs failed 14
> 
> data_abort_handler: data_aborts fsr=0x180e far=0x7fffcba8
> dab_buserr far 0x7fffcba8 -> NULL pm->pm_l1[far >> L1_S_SHIFT] = 0x0
> copyargs, 1620: copyout @0x7fffcba8 4
> copyoutargs: copyargs failed 14
> 
> data_abort_handler: data_aborts fsr=0x180e far=0x7fffcb88
> dab_buserr far 0x7fffcb88 -> NULL pm->pm_l1[far >> L1_S_SHIFT] = 0x0
> copyargs, 1620: copyout @0x7fffcb88 4
> copyoutargs: copyargs failed 14
> 
> data_abort_handler: data_aborts fsr=0x182e far=0x40062000
> dab_buserr far 0x40062000 -> NULL pm->pm_l1[far >> L1_S_SHIFT] = 0x0
> copyin_vmspace: copyin 0x40062000 0xc8f0a000 372 return 14

So why is uvm_fault returning an error for those address instead of
fixing them up?