Armada XP (mvebu) PCIe memory (BAR/window) re-allocation

[Matthew Minter]

Hi Guys,

This is not a proper update yet, however as a test to confirm if the
issue is indeed relating to the address mapping, I modified the ahci
code to use a hard coded ioremap to the correct address range
0xe0200000-0xe0201fff. This did not affect the error in any way and I
still have the same problem. Thus I can conclude that the ahci driver
pointing to the wrong address does not seem to be the problem. However
I am somewhat stumped on where to look next. I am going to read over
the PLX datasheet in case there is a known issue with my
configuration. Again, I will post if I have any more information. I
will also see if I can try jtaging the chip so I can check the state
of the PCI bus and mmu at the time of failure.

Many thanks,
Matt

On 3 April 2014 19:24, Thomas Petazzoni
<thomas.petazzoni at free-electrons.com> wrote:
> Dear Jason Gunthorpe,
>
> On Thu, 3 Apr 2014 12:23:22 -0600, Jason Gunthorpe wrote:
>
>> Your oops seem to suggest that the very first MMIO read from the AHCI
>> is causing this:
>>
>> > [  191.654496] Unhandled fault: external abort on non-linefetch
>> > (0x1008) at 0xf0460004
>>
>> And the address 0xf0460004 is certainly funny - that doesn't look like
>> it is valid at all, but prehaps it is a bogus report (?)
>
> Notice that the address reported by the Unhandled fault message is a
> *virtual* address, not a *physical* address. So you have to look to
> what physical address it corresponds to draw some conclusions, I
> believe.
>
> Thomas
> --
> Thomas Petazzoni, CTO, Free Electrons
> Embedded Linux, Kernel and Android engineering
> http://free-electrons.com

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