Set the AT91RM9200 clock to synchronous mode

Patch by Anders Larsen, 29 Apr 2005
2005-10-05 02:02:25 +02:00
parent 645da51097
commit 3b9dfddfd8
2 changed files with 8 additions and 0 deletions
--- 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