AT91: reset.c: fix comments, add option
Signed-off-by: Reinhard Meyer <u-boot@emk-elektronik.de>
diff --git a/arch/arm/cpu/arm926ejs/at91/reset.c b/arch/arm/cpu/arm926ejs/at91/reset.c
index 1b67e77..d2569d8 100644
--- a/arch/arm/cpu/arm926ejs/at91/reset.c
+++ b/arch/arm/cpu/arm926ejs/at91/reset.c
@@ -27,18 +27,19 @@
#include <asm/arch/at91_rstc.h>
#include <asm/arch/io.h>
-/*
- * Reset the cpu by setting up the watchdog timer and let him time out.
- */
+/* Reset the cpu by telling the reset controller to do so */
void reset_cpu(ulong ignored)
{
at91_rstc_t *rstc = (at91_rstc_t *) AT91_RSTC_BASE;
- /* this is the way Linux does it */
-
- writel(AT91_RSTC_KEY | AT91_RSTC_CR_PROCRST | AT91_RSTC_CR_PERRST,
- &rstc->cr);
-
- while (1);
- /* Never reached */
+ writel(AT91_RSTC_KEY
+ | AT91_RSTC_CR_PROCRST /* Processor Reset */
+ | AT91_RSTC_CR_PERRST /* Peripheral Reset */
+#ifdef CONFIG_AT91RESET_EXTRST
+ | AT91_RSTC_CR_EXTRST /* External Reset (assert nRST pin) */
+#endif
+ , &rstc->cr);
+ /* never reached */
+ while (1)
+ ;
}