Set the AT91RM9200 clock to synchronous mode

Patch by Anders Larsen, 29 Apr 2005
19 years ago · 3b9dfddfd8
parent 645da51097
commit 3b9dfddfd8
2 changed files with 8 additions and 0 deletions
--- a/3
+++ b/3
@ -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

--- 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