[PATCHv7 9/9] ARM: dma-mapping: add support for IOMMU mapper

[KyongHo Cho]

On Tue, Mar 20, 2012 at 10:50 PM, Subash Patel <subashrp at gmail.com> wrote:
> Sorry for digging this very late. But as part of integrating dma_map v7 &
> sysmmu v12 on 3.3-rc5, I am facing below issue:
>
> a) By un-selecting IOMMU in menu config, I am able to allocate memory in
> vb2-dma-contig
>
> b) When I enable SYSMMU support for the IP's, I am receiving below fault:
>
> Unhandled fault: external abort on non-linefetch (0x818) at 0xb6f55000
>
> I think this has something to do with the access to the SYSMMU registers for
> writing the page table. Has anyone of you faced this issue while testing
> these(dma_map+iommu) patches on kernel mentioned above? This must be
> something related to recent changes, as I didn't have issues with these
> patches on 3.2 kernel.
>

0xb6f55000 is not an address of SYSMMU register if your kernel starts
at 0xc0000000.

Can you tell me any detailed information or situation?

Regards,

KyongHo.