+#if defined(CONFIG_MASK_AER_AO)
+ /* Write the Arbiter Event Enable to mask Address Only traps. */
+ /* This prevents the dcbz instruction from being trapped when */
+ /* HID0_ABE Address Broadcast Enable is set and the MEMORY */
+ /* COHERENCY bit is set in the WIMG bits, which is often */
+ /* needed for PCI operation. */
+ lwz r4, 0x0808(r3)
+ rlwinm r0, r4, 0, ~AER_AO
+ stw r0, 0x0808(r3)
+#endif /* CONFIG_MASK_AER_AO */
+