mpc83xx: Store and display Arbiter Event Register values

[u-boot] / cpu / mpc83xx / start.S

diff --git a/cpu/mpc83xx/start.S b/cpu/mpc83xx/start.S
index 75ad36cb3dbdd4ded9fc22dd0552e6e2a4543575..e452bfbc5e07294bbc8fed92f0dfdc4814b15d64 100644 (file)
--- a/cpu/mpc83xx/start.S
+++ b/cpu/mpc83xx/start.S
@@ -483,6 +483,17 @@ init_e300_core: /* time t 10 */
 1:
 #endif /* CONFIG_WATCHDOG */
 
+#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 */
+
        /* Initialize the Hardware Implementation-dependent Registers */
        /* HID0 also contains cache control                     */
        /*------------------------------------------------------*/