Set the AT91RM9200 clock to synchronous mode

Patch by Anders Larsen, 29 Apr 2005

diff --git a/CHANGELOG b/CHANGELOG
index 53afe66..8c63cde 100644 (file)
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -2,6 +2,9 @@
 Changes for U-Boot 1.1.4:
 ======================================================================
 
+* Set the AT91RM9200 clock to synchronous mode
+  Patch by Anders Larsen, 29 Apr 2005
+
 * Add support for Cogent csb637
   Patch by Anders Larsen, 29 Apr 2005
 

diff --git a/cpu/arm920t/at91rm9200/lowlevel_init.S b/cpu/arm920t/at91rm9200/lowlevel_init.S
index 05887ad..6941d42 100644 (file)
--- a/cpu/arm920t/at91rm9200/lowlevel_init.S
+++ b/cpu/arm920t/at91rm9200/lowlevel_init.S
@@ -123,6 +123,11 @@ LoopOsc:
        cmp     r2, r0
        bne     2b
 
+       /* switch from FastBus to Synchronous clock mode */
+       mrc     p15, 0, r0, c1, c0, 0
+       orr     r0, r0, #0x40000000     @ set bit 30 (nF) notFastBus
+       mcr     p15, 0, r0, c1, c0, 0
+
        /* everything is fine now */
        mov     pc, lr