From d32a874b9b4c1e949ee38be7790f6bf6d6143451 Mon Sep 17 00:00:00 2001 From: Yuri Tikhonov Date: Sun, 6 Apr 2008 19:19:14 +0200 Subject: lwmon5 watchdog: limit trigger rate Limit the rate of h/w watch-dog triggering on the LWMON5 board by the CONFIG_WD_MAX_RATE value. Note that an earlier version of this patch which used microseconds instead of ticks dis not work. The problem was that we used usec2ticks() to convert microseconds into ticks. usec2ticks() uses get_tbclk(), which in turn calls get_sys_info(). It turns out that this function does a lot of prolonged operations (like divisions) which take too much time so we do not trigger the watchdog in time, and it resets the system. Signed-off-by: Yuri Tikhonov --- include/configs/lwmon5.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/configs/lwmon5.h') diff --git a/include/configs/lwmon5.h b/include/configs/lwmon5.h index ced7ba6f0..58f078b6d 100644 --- a/include/configs/lwmon5.h +++ b/include/configs/lwmon5.h @@ -455,6 +455,7 @@ #define CONFIG_HW_WATCHDOG 1 /* Use external HW-Watchdog */ #define CONFIG_WD_PERIOD 40000 /* in usec */ +#define CONFIG_WD_MAX_RATE 66600 /* in ticks */ /* * For booting Linux, the board info and command line data -- cgit v1.2.3