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TMS320DM8127: TMS320C647x, megamodule - user mode task with a limited access to an external memory.

Pawel Abramczuk
Prodigy 20 points
Part Number: TMS320DM8127

I'm using TMS320C674x (as a part of Davinci OMAP chip).

The question is.

Is there any way to protect external memory from reading by task working in user mode (TSR - show that task is in user mode).

I want to limit only this task (lack of access to read extrnal memory).

I tried to configure L2MMPA0-63 (all 63 pages) and remove UR atribute (by setting 0) hopping that this generate an exception when task (user mode) try to read (by L2 cache) external memory (external memory is markt as cachable).

I monitor all exception (from 120-124) but there is no raised exception, when task reads (is able) data (not having UR atribute in MPPA's)

When I set to 0 LOCAL flag, I got an exception immiadatelly.

Regards

Pawel