On 31 January 2018 at 22:09, Thor Thayer [off-list ref] wrote:

Hi,

I'm enabling the ARM SMMU-500 on an ARM64 A53. I'm hitting a data abort in
the probe functions because I'm accessing the registers in EL1 mode.

Why do you think the fact that you are running at EL1 is causing the data abort?

Linux starts in EL2 mode but drops down to EL1 mode by the time it reaches
the arm-smmu probe function.

Is there something else I need to add to either move the arm-smmu probe
earlier or remain in EL2 until after the arm-smmu probe?

No. I am pretty sure EL2 vs EL1 is not causing your issue. Could you
elaborate on the nature of the exception you are getting?

A Google search didn't turn up anything so I hoped posting to the list would
help.

Thanks in advance,

Thor


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