Hi KyongHo,

On 03/21/2012 05:26 AM, KyongHo Cho wrote:

On Tue, Mar 20, 2012 at 10:50 PM, Subash Patel[off-list ref]  wrote:

quoted

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?

I hate to say this, but I am not able to catch the fault location even 
with JTAG. Once the fault comes, the debugger looses all control over. I 
think now possible method is reproduction at your end :)

Regards,

KyongHo.

Regards,
Subash