ARM Cortex A9 - About DSB

Level 1 Memory System
ARM DDI 0388I Copyright © 2008-2012 ARM. All rights reserved. 7-10
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7.5 About DSB
The Cortex-A9 processor only implements the SY option of the DSB instruction. All other DSB
options execute as a full system DSB operation, but software must not rely on this operation.