On 28/01/16 04:54, Vijay Kumar wrote:
Hii all,
I am new to this mailing list and i need some help.I am trying
to add exynos iommu support for my board with exynos5250-soc for fimd.I am
getting this error at exynos_sysmmu_irq.I am pretty confused with it and
didn't know what to do.I strucked at this point.So please explain why this
error occurs.My device is attaced correctly to iommu.
It looks like something (either the client device or the sysmmu itself,
I'm not familiar with that hardware) has tried to access physical
address 0, and the MMU is raising the interrupt to report that it got an
error response back for that access. On Exynos 5 that's where the boot
ROM stuff lives, so there may well be nothing there at all in the
non-secure memory map. Either way, it's a long way from RAM (which will
be somewhere above 0x20000000), so you've almost certainly wound up with
some bogus mapping in your sysmmu page table. First thing I'd try is
adding a check in exynos_iommu_map() to scream if someone passes in a
dodgy-looking physical address, then work backwards from there.
Robin.
Thanks and Regards,
Vijay Kumar Prathipati.
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